FPSO For EPS North Malay Basin

COMPANY: EMAS-AMC

PROJECT TITLE: FPSO for EPS North Malay Basin

CLIENT: HESS

LOCATION: Malaysia

YEAR: 2013

VESSEL: Mutli Purpose Offshore Construction Vessel Lewek Crusader

The LCR is a multi puspose self-propelled offshore construction vessel. It is equipped with DP3 dynamic positioning, two work class ROVs, 400MT heavy duty crane and a 150MT subsea knuckle jib crane The barge measures 134m long by 32m wide, with mean operating draft of 6.0m. Refer to drawing in Appendix B, Drawing No. 11011-AMC-INT-ME-DW-3001 and LCR Specification in Appendix D

The barge is equipped with two pedestal cranes. The main crane is a 400MT Huisman pedestal mounted offshore crane with max. radius 64m -120MT capacity and min, radius 12m – 400MT capacity. The auxiliary hoist on the Huisman crane extends up to 72m and 50MT capacity for all radius. The aux. hoist has active heave compensation and man riding capacity. Refer to drawing in Appendix D, Drawing No. A07-55000-00-10

The other crane is a 150MT MacGregor Semi AHC Offshore Knuckle Jib Crane with capacity 150T at 15m radius.

All of the barge accommodation is located above the main deck, and is fully air conditioned with a mess hall and recreational facilities. A helideck is located over the bow superstructure and is capable of accommodating a Sikorsky S61N and S92 (MTOW 12.8MT)

Following are the support vessels assisting the LCR during mooring system installation operation:

B1 (ENA COMET) and T1 (ENA GRIFFIN) by EMAS-AMC
B2 (ENA TRAVELLER) and T2 (ENA SOVEREIGN) – by EMAS-AMC
F1 [LEWEK TEAL] – by EMAS-AMC

SCOPE OF WORK:

The offshore installation is planned in a single campaign with Lewek Crusader as the main construction vessel. The overall Scope of Work detailed below:

FPSO Mooring System Installations

3 x 3 mooring system configuration
9 x 40m 82” driven anchor piles
9 x 650m Ø114mm studless mooring chains
Mooring chains pre-tensioning

FPSO Tow

Takeover control of the FPSO at Singapore anchorage
Connection of towing equipment and AHTs
Tow from takeover location to installation location

Upon arrival of FPSO in the field, hold the FPSO in position utilizing the AHTs and hook-up the mooring chains into the turret and perform final tensioning (utilizing winch on board the FPSO) and chain tail removal. When the FPSO is successfully moored in position the flexible flowline and riser installation and pre-commissioning can be completed. An outline of this is as follows:

Flexible Risers Installation

1 x 12” riser (comprises of 800m of dynamic riser and 680m of static riser)
1 x 10” riser (comprises of 230m length)
Installation of 6 nos of Buoyancy modules on each riser
Midline connection and backseal test of 12” flowline /riser (between static and dynamic sections)
Subsea tie-in of 12” flowline to existing flange at the WHP
Subsea tie-in of 10” riser to the existing flange on the PLEM
Flood and hydro/leak test of 12” flowline/riser
Flood and hydro/leak test of 10” riser
Backseal test of riser tie-ins and mid-line connection utilizing Kamos gasket (12” dynamic and static sections)
Dewatering of both 10” and 12” flexible lines
Dry and nitrogen pack both the 10” and 12” flexible lines

Document Scope

The scope of work for mooring system installation includes

Survey calibrations check against Kamelia field fixed position and pre-installation survey.
Deploying the PGF and positioning at the design pile location.
Upending the mooring pile connected with chain and stabbing it into the PGF.
Assembling the hammer with follower and stabbing on top of the pile followed by driving the pile to target depth.
Recovering the hammer and pile follower no. 1 assembly.
Laying the mooring chain and abandoning the chain end on the seabed with surface pick up rigging arragement
Relocating the PGF to the next pile location.
Completing installation of all the piles
Recovering the mooring chain of each mooring leg to tensioning tug deck, tensioning the line and abandoning on the seabed with subsea pick up rigging arrangement

MY INVOLVEMENT:

I was onboard to install the FPSO

INTRODUCTION

General

The FPSO Perisai Kamelia is undergoing conversion for redeployment to the Kamelia field, which is located in the North Malay Basin under PSC PM 301. This field will be the first to be brought on stream via an Early Production System. The objective of the Early Production System is to provide an early flow of gas, prior to the full field Integrated Gas Development; First gas is targeted to be the end of June 2013. The FPSO installation site is located offshore of Peninsular Malaysia approximately 150 km North East of Kota Bahru, (PM 301) Northern Malay Basin.

FPSO Perisai Kamelia (DNV Classed) is one of the world’s largest gas FPSO. It has got a length of 263.7m and a breadth of 40.8m. The DWT would be 127,540 tons with a throughput and storage of 175 MMSCFD and 300,000 BBLS.

The FPSO will be converted in Singapore to include an external turret mooring system, towed to the installation location and then moored in the vicinity of a Wellhead Platform (WHP) in approximately 55m of water via 9-leg (3×3) chain mooring consisting of 114mm chain with 82” diameter piles in an approximately 595m radius from centre of rotation. The FPSO will receive fluids from the WHP via a 12”, 1480m import flowline/riser arrangement. After the gas is processed it will be exported from the FPSO via a 10”, approximately 230m flexible export riser via a PLEM into the Lawit pipeline

EMAS AMC are being engaged in the project as the SUBCONTRACTOR responsible for the transport (tow) and installation of the FPSO, including the installation and hook-up of the mooring system and the installation and pre-commissioning of the 10” riser and 12” riser/flowline.

EMAS AMC shall mobilize its installation vessel, the Lewek Crusader, on or about the 06^tMay 2013 for an infield date of 18 May 2012. The installation activities are estimated approximately until 23 June 2013. 2 cargo barges with their respective towing tug will be used to transport project materials and equipment.

Limiting Seastate

This section defines the limiting seastate values for all the activities within Mooring System Installation Scope as defined within this procedure. The limiting seastate number will be based on mooring analysis report 11011-AMC-HESS-ME-RA-3111report Note that the limiting seastate values defined hereunder shall be treated as guidance values only. It will be upto the discretion of the Barge Masters, Tug Master and OCM in consultation with the CAR, to take a decision to carry out operations offshore based upon specific site conditions at the time.

Operation	Limiting Guidance Seastate, H_s (m)
Overboarding and Positioning PGF	0.5
Upending and Hang Off Pile Follower	1.5
Upending and Stabbing Anchor pile into PGF	1.5
Upending hammer and assembling with the follower	1.5
Overboarding hammer/follower assembly and pile driving	1.5
Mooring Chain Installation and Abandonment	2.0
Recovery of PGF (break out suction) and repositioning	1.0
Mooring Chain Pretensioning	1.0

Product Data & Installation Paramenters

COMPANY Supplied Equipment

The table below summarizes the COMPANY provided free issued permanent materials.

Item	Description
1	9 off anchor piles, 40m x 82” diameter
2	9 off connecting shackle between anchor pile and anchor chain
3	9 off Ø114mm studless mooring chains, 650m long each

General Installation Parameter

The procedure will be based upon following installation parameters

General

The general environment conditions observed in the North Malay Basin are predominantly characterised by monsoonal conditions. The area is also susceptible to tropical cyclone conditions. During offshore installation phase, the predominant weather is South West monsoon. Refer to document no: C50883_6893 Metocean Criteria at PM301 and Bergading Fields For The Integrated Gas Development NMB, Malaysia

Water Depth, Tidal Range and Bathymetry

The water depth in the field ranges form 50-60m and hence a mean water depth of 55m shall be used. The tidal levels derived for the field are shown in below :

Tidal Descriptor	Height Relative to MSL [m]	Height Relative to LAT [m]
Highest Astronomical Tide (HAT)	0.74	1.37
Mean Sea Level	0.00	0.63
Lowest Astronomical Tide (LAT)	-0.63	0.00

Geodetic Parameter

Refer to the document Survey Positioning Procedure – FPS2 Mooring System Installation Document No. 11011-XXX-HESS-MO-KA-4211 for details of the geodetic parameters

FIELD LOCATION

LOADOUT & TRANSPORTATION

FPSO INSTALLATION AID

Equipment

NO.	DESCRIPTION	QUANTITY
Main Installation Vessel
1	Lewek Crusader	1
Cargo Barge #1 (B1)
1	250’ Barge [ENA COMET]	1
2	Cargo Barge #1 Tow Tug [ENA GRIFFIN]	1
Cargo Barge #2 (B2)
1	330’ Barge [ENA TRAVELLER]	1
2	Cargo Barge #2 Tow Tug [ENA SOVEREIGN]	1
Tensioning Tug (F1)
1	Lewek TEAL	1
Survey & Positioning
A	LEWEK CRUSADER
1	C-Nav DGNSS c/w C-Nav Global Correction Signal (Primary and Secondary)	2
2	Survey Gyrocompass (Primary)	1
3	GNSS Heading Sensor (Secondary)	1
4	EIVA Navigation & Barge Management System	1+1
5	Remote EIVA Navigation Computer (ROV, Dive Control)	2+1
6	Remote LCD Monitors (Capt/DPO and 1 spare)	2+1
7	Radio Telemetry System Fq1 and Spare	1+1
8	UPS (Gyro+BMS+GNSS)	2
9	Admin PC	1
10	Mini-Beacons and Chargers (ROV x2, TMS x 1, Crane, Diver1, Diver2, 1 Spare)	7+1
11	Total Station c/w Accessories	1
12	Midas SVX2 SVP/CTD Profiler	1+1
B	HOOK-UP AND TENSIONING
1	EIVA Tug Management System on Frequency Fq2	1
2	Radio Data Telemetry System: and Spare	1+1
C	PERISAI KAMELIA FPSO
1	C-Nav DGNSS c/w C-Nav Global Correction Signal: Bridge (Primary & Secondary) and Turret	2+1
2	EIVA Barge Management System: Bridge Fq2 and Spare	1+1
3	EIVA Tug Management System: Turret Fq1	1+1
4	Radio Data Telemetry System: Bridge Fq2, Turret Fq1	2+1
5	Meridian Gyrocompass (Primary & Secondary)	2
6	LCD Monitors: FPSO Hook-up Supervisor, 1 Spare	1+1
7	UPS: GNSS, Radio, BMS, Gyro, 1 Spare	2
D	AHT x 3
1	C-Nav DGNSS c/w C-Nav Global Correction Signal (Spare on LCR)	1
2	EIVA Tug Management System Fq1 (Spare on LCR)	1
3	Radio Data Telemetry System Fq1 (Spare on LCR)	1
4	Hemisphere GPS Heading Sensor (Spare on LCR)	1
5	LCD Monitors: Bridge (Spare on LCR)	1
6	UPS: GNSS, TMS, GPS-HDG, Radio, 1 Spare (Spare on LCR)	1
E	Quayside Mobilisation Kit (will not go offshore)
1	C-Nav DGNSS c/w C-Nav Global Correction Signal	2
2	Logging Laptop	1
3	Survey Tripods w tribrachs for GPS antenna mounting	4
4	Reflective prisms	4
Remotely Operated Vehicle
1	Triton XLX System WROV’s with TMS	2
2	Control Shack and 20ft Equipment Container	2
3	Launch and Recovery A-Frame	2
Pile Driving Spread
1	Pile Guide Frame	1
2	Pile Driving Hydraulic Hammer equipped with a suitably modified subsea sleeve to drive 82” piles c/w power pack and control van	1
3	Pile follower with 77” section to interface with the pile and 50” section to interface with the hammer	2
4	Internal Lifting Tool, to suit 82” pile c/w powerpack and hose reel	1
Chain Laying & Tensioning spread
1	50MT Hydraulic winches c/w HPU	1
2	15MT Hydraulic winches c/w HPU	1
3	40MT snatch blocks to bounce the winch wire on the CB #1 deck.	2
4	40T Chain Gipsy c/w HPU	1
5	Chain Tensioing arrangement onboard LEWEK TEAL	1

SITE SPECIFIC SURVEY

General

The primary survey system used throughout the mooring system installation for barge positioning and vessel tracking is DGPS. A computerised barge navigation system will be utilised to graphically display the current location and heading of LCR and tugs in relation to the other vessel, permanent structures and pipelines in the vicinity. Position and heading of the cargo barge will also be displayed relative to LCR especially during mooring pile and chain installation work sequence which is sensitive to the distance between cargo barge and crane. Cargo barge position and heading will be plotted on survey screen on LCR bridge for Survey Team, OCM and LCR master to monitor the position.

This section outlines the survey activities to be performed before and during the mooring system installation. Further technical specifications on the survey systems can be found in Survey Positioning Procedure – FPS2 Mooring System Installation Document No. 11011-XXX-HESS-MO-KA-4211 and ROV Operating Procedure Document No: 11011-XXX-HESS-MO-KA-4221

Pre-Installation Survey

ROV pre-installation survey will be done using visual survey and sonar scan at intended locations.

Following pre-installation surveys are to be performed:

Calibration of survey system based on Kamelia Fixed Point Coordinate. ROV will station keeping at given coordinate and the result will be compared between survey system coordinate and given fixed point coordinate.
For PGF location, ROV will station keeping at centre of PGF location and will turn slowly 360° to identify any debris and or anomalies at PGF location. Following that, the ROV will take water depth readings at each of the corner of PGF mudmat and the pile centre location.
For mooring chain lay and abandonement route, ROV will do visual survey and sonar scanning shall be performed along each and every leg.
For PLEM location, ROV will station keeping at centre of PLEM location and will turn slowly 360° to identify any debris and or anomalies at PLEM location. Following that, the ROV will take water depth readings at each of the corner of PLEM.
For WHP connection point location, ROV will station keeping at centre of WHP connection point and will turn slowly 360° to identify any debris and or anomalies at WHP connection point location. Following that, the ROV will take water depth readings at WHP connection point.

The objectives of the pre-installation survey are to identify any seabed anomalies or debris and estimate the water depths within the surveyed area. Any debris or anomalies discovered during the survey shall be reported to OCM and CAR. Preliminary survey reports by ROV team including video recording and by Survey team will be provided during early reporting to OCM and CAR. Full survey report as per ROV Operating Procedure (11011-XXX-HESS-MO-KA-4221) and Survey Positioning Procedure – FPS2 Mooring System Installation (11011-XXX-HESS-MO-KA-4211) will be Only after the acceptance of the pre-installation survey, shall the installation commence.

After the pre-installation survey acceptance for the first pile location and mooring leg is obtained, the installation operations for that pile can technically commence.

Survey During Installation

Following surveys to be performed during the installation:

PGF position, orientation and level to be surveyed before and after the pile self-penetration (with hammer and follower weight) are completed.

Several means will be done for this purpose as such:

Survey beacons will be installed on PGF
ROV docking station will be installed on PGF
PGF bull-eyes will be installed on PGF

Self-penetration of the piles to be surveyed with self-weight only and with hammer and follower weight.

Anchor pile and pile Follower will have marking to indicate the length of each item. The marking will be used as input data to know the self-penetration of the piles. ROV will do observation to know the intended pile follower marking.

Final pile penetration after pile driving to be surveyed.

Pile Follower will have marking to indicate the length which will be used as input data to know the final pile penetration. ROV will do observation to know the intended pile follower marking.

Chain end location on seabed and along chain laid route to be surveyed after chain lay down until pile location after abandonment of the chain

After completion of piling operation and chain laying for each leg, LCR will surveys the installed mooring leg using ROV to fly in along the route and do the visual survey until pile location when visibility permitted

As-Built Survey for mooring chain after final tensioning

After completion of FPSO hook-up and final tensioning, LCR will surveys the installed mooring leg using ROV to fly in along the route and do the visual survey until pile location when visibility permitted. Touch down point location will be recorded.

As-Built Survey for 12” and 10” riser after rotation test

After completion of Riser hok-up to FPSO and rotation test LCR will surveys the installed risers using ROV to fly in along the route and do the visual survey until PLEM and WHP when visibility permitted.

As-built survey for each activity will be documented and reported and will be included as As-Built Dossier to CONTRACTOR and COMPANY. The as-built survey report will be presented in form of report, data recorded, video recording and as-built field layout. Any difference to detail procedure will be documented. Refer to ROV Operating Procedure (11011-XXX-HESS-MO-KA-4221) and Survey Positioning Procedure – FPS2 Mooring System Installation (11011-XXX-HESS-MO-KA-4211) for detailed survey operation and deliverables.

FPSO INSTALLATION

ROV Preparation Works

ROV to check the ROV Docking position on PGF and do the trial fit. Marking of ROV docking pipe with yellow paint
ROV to check 45t ROV hooks and 250T ROV hooks, check the mechanism of latch and pulling rope. Marking of ROV hooks with yellow paint
ROV to check UBSL beacon to be used. Check and confirm the rigging (PP rope) to be used to recover the beacon
ROV to check the PGF lifting rigging post
ROV to check the PGF orientation mechanism including bullseye
ROV to check the structure of PGF, including the orientation fin, lifting rigging, recovery rigging.

Hammer Spread Preparation Works

Hammer Tech check the ILT setup
1. Consumable requirement
2. Hoses connection including hoses way during ILT deployment
3. Test to check ILT up and running
4. Rigging arrangement to be checked
Hammer Tech check the PGF setup
1.Rigging arrangement to be checked
Hammer Tech check hammer setup
1. Consumable requirement
2. Hoses connection including hoses way and handling during hammer deployment
3. Spreader bar rigging arrangement to be checked
4. Test to check Hammer up and running

Survey Spread Preparation Works

Survey check all survey system up and running
1. Check Geodetic Parameters
2. Check Field Layout
3. Check all given coordinates are coherent

LCR & Barge Preparation Works

Check Machineries onboard B1 (15T winch, 35T winch and 40T chain gipsy)
1. Consumable requirement
2. Hoses connection
3. Seafastening condition
4. Test to check machineries up and running
Check Pile Follower Hang – Off Frame
1. Location based on deck layout
2. Seafastening condition
Check Chain Hang-Off Frame
1. Location based on deck layout
2. Seafastening condition
Check Pile Follower Lay down area on LCR
1. Marking the proposed area
2. Cleared from other equipment
3. Deck protection will be installed such as doubler plate and wood ( as required)
Check all rigging and relocated based on specific activities. Make note for every rigging for easy identification

Preliminary Survey

Status:

LCR approach Kamelia fixed point coordinate
Inform ROV the distance from ROV A Frame to Kamelia fixed point coordinate
Deploy ROV. ROV goes to intended location
ROV to station keeping at given coordinate for 5 minutes. Survey and ROV to fixed the coordinate, FE to record the ROV coordinate
Survey to check the as-built coordinate and compared the result to the given coordinate. OCM to check the comparison result and consult with CLIENT
ROV to go back to TMS
LCR approach PGF target position no.1
Inform ROV the distance from ROV TMS to PGF target position no.1
Deploy ROV, ROV goes to intended location
ROV to station keeping at centre of PGF target position no.1. Turn slowly 360° to identify any debris and or anomalies at PGF target location no.1. ROV to take water depth readings at each of the corner of PGF mudmat target location. Note: PGF dimension 15.3m x 15.3m
Visual survey range is dependent on visibility and turbidity of the water column. 5-8 meters if water visibility is perfect. Max on sonar range 30-40 meter max range with 3-5 meter sections.
After completed of survey of PGF target locaton no. 1, ROV ROV will swims along the line and do the visual survey and sonar scanning for every mooring chain lay and abandonement. LCR follows the ROV
Note: Lay line approx. 650 m (+140m)
Visual survey range is dependent on visibility and turbidity of the water column. 5-8 meters if water visibility is perfect. Max on sonar range < 50 meter range and 8 meter sections.
Repeat Step 22-26 for PGF and mooring line no. 2 – no. 9
Repeat Step 22-25 for PLEM and WHP target location
Record all results and notify clients about the result
OCM to consult with CLIENT and CLIENT to given approval to go ahead for the installation

Pile Guide Frame Operation

General

This section covers the PGF overboarding, re-positioning and recovery operations. The PGF will be overboarded from the B2. Once deployed subsea, it is not necessary to recover the PGF to surface unless all the piles are driven. For relocating the PGF from one pile location to the other, the PGF shall be lifted ~10m off the seabed and LCR shall transit to the next location.

Mooring Leg Angle and Design Pile Location

Description	Heading (deg) wrt North (measured clockwise)	Easting (m)	Northing (m)
Pile #1	62.5°	302 846.79	775 264.50
Pile #2	67.5°	302 869.49	775 215.82
Pile #3	72.5°	302 887.86	775 165.35
Pile #4	182.5°	302 290.47	774 386.82
Pile #5	187.5°	302 236.96	774 391.50
Pile #6	192.5°	302 184.07	774 400.82
Pile #7	302.5°	301 808.54	775 307.45
Pile #8	307.5°	301 839.34	775 351.44
Pile #9	312.5°	301 873.87	775 392.58

Installation Tolerance

Positioning of PGF

The specification for the positioning tolerance of PGF is +/-3.0m.

Vertically of PGF

The specification for the verticality of PGF is +/- 2⁰ measured by means of the bullseye on the PGF.

Orientation of PGF

The specification for heading orientation of PGF is +/- 2⁰

Mooring Analysis Result

Below table shown the operational criteria for lowering of Pile Guide frame through splash zone

Tp [s]		Hs [m]
		0.5	0.6	0.7	0.8	0.9	1.0
5		78%	94%
6		68%	77%	88%
7		69%	78%	87%	94%
Legend
	Within allowable limit (<90%)
	Close to crane capacity (>90%)
	Not acceptable
XX%	Crane Lift Utilization (Out of 220 Te)

Lift Information

Parameter	Value	Unit
Weight (+mud mat) in air (3% contingency weight)	108.15	MT
Rigging Weight in air	5.04	MT
Total Lift Weight in air	113.19	MT
Total Submerged Lift Weight	98.47	MT
On board lifting Max Hook load (20% DAF)	135.82	MT
Subsea lifting Max Hook load (80% DAF)	177.25	MT
Recovery load (100% seabed suction)	196.92	MT

Operational Parameter

There is no heading restriction for LCR during PGF overboarding, re-positioning or recovery as long as PGF’s installation parameter still inside PGF installation tolerance. Orientate LCR along the most favourable heading to wind and waves.

PGF Overboarding

Status

·HIRA has been reviewed and the mitigation actions been put in place as per document no: 11011-AMC-HESS-RM-RA-1301 Project Hazard Identification and Risk Analysis (HIRA)
· Toolbox talk has been conducted with all personnel to be involved in the operation.
· Offshore weather forecast has been reviewed and actual weather condition is still inside limiting seastate to do intended operation. All parties agreed to proceed with consideration to actual weather condition. Refer to Section 1.12 Table 1 for Limiting Seastate
· The main hoist on the LCR main crane is reeved with the configuration of 5 falls SWL 220mt @ max. 42m, hook travel 168m
· PGF target area is surveyed and the Client Representative is notified of any seabed anomalies identified (Refer to Sub Task #0.4)
· All subsea assets and the design locations of the piles and the corridors for the mooring chains are displayed on the vessel navigation screen.
· The PGF target box of 25m x 25m for each pile shall be displayed on the navigation screen along with the design position of the PGF footprint.

Position the PGF barge B2 on the portside of LCR and transfer riggers. Tied B2 alongside LCR and transfer intended personnel to B2. Reference :
Standard Marine Operation – Hess
11011-AMC-INT-ME-DW-1003 Pile Guide Frame Deployment
11011-AMC-HESS-MO-KA-2202 Transfer of Personnel
Survey to record the transponder identification with reference to the transponder bucket location on the PGF. Note: The transponder bucket offset position will have been measured prior to the PGF mobilization. Reference : P10046-A001-02 Pile Guide Frame GA
Check the bullseye and confirm the steel ball is visible.
Deploy ROV which has been equipped with ROV docking frame.
Ensure the PGF lift rigging is pre-connected and in good condition for the lift to be performed.
Reference: 11011-AMC-INT-ME-DW-1011 Pile Guide Frame Lift Rigging Arrangement
Slew crane main hook to B2 and check lifting plan. Note: Approved and sign lifting plan by all parties
Assembly the PGF deployment pennant to the crane stinger on the main block on the main crane. Reference: 11011-AMC-INT-ME-DW-1003 Pile Guide Frame Deployment
11011-AMC-INT-ME-DW-1031 Deployment Stinger Arrangement for Huisman Main Block
11011-AMC-INT-ME-DW-1010 Pile Guide Frame Deployment and Recovery Pennant Arrangement
11011-AMC-INT-ME-DW-1011 Pile Guide Frame Lift Rigging Arrangement
Tie polypropylene rope tag lines to the PGF and secure the tag lines. Note: The configuration of the tagging system is to be confirmed by the Deck Foreman during toolbox talk based on conditions of PGF and constraints at the time.
Connect the deployment pennant 250MT ROV hook to the PGF lift rigging and take out any slack in the PGF lift rigging by coming up on the crane. Note PGF Lifting rigging end termintation will be 142MT Masterlink 2 pcs.
Remove all seafastenings from the PGF.
Lift the PGF clear off the deck until clearance +/- 2m from deck
Note:
Max. crane load (include DAF) in air 136MT Max. crane load (include DAF) in water 178MT
Crane capacity during lifting off deck of B2 is 220MT at 24.5m
PGF target location approximately 25m from barge stern (10m from edge of PGF), it will give crane capacity 202MT on 38m radius during lowering of PGF
Slew/adjust the crane boom as required and deploy the PGF through splash zone, paying out on the crane wire as required. Note:
· The tag lines are to be cleared off the PGF before it is submerged into water.
· Zero the crane payout meter when the PGF base touches the water surface
· Confirm the reading on crane wire meter in working on way down.
· Limiting seastate for PGF overboarding is H_S=0.5m.
Lower the PGF within 10m from the seabed monitoring with the ROV. Record max. hook load
Manoeuvre LCR to the design pile location under ROV instruction.
ROV to dock into the docking frame on the PGF and orientate the PGF as required.
Once the PGF is within the required target box and within the specified heading envelope, place the PGF on the seabed. Crane wire comes down fast to ensure enough slack on crane wire to avoid crane taking load during vessel heave. Note: ROV to come down simultaneously with the descent.
Limiting seastate for PGF positioning is H_S=0.5m.
Survey to confirm the PGF installation position and orientation. ROV to check the bullseye on the PGF as a measure of verticality. Survey to display the PGF as placed position on the vessel navigation screen in a contrasting colour to the design position. Note: There will be ROV Docking Pipe if PGF re-orientation needed. The capacity for each docking pipe will be 10T. Reference: 11011-AMC-INT-ME-DW-4025 ROV Docking Pipe & Beacon Holder Details
Record the position, orientation (based on survey system reading on beacons)and verticality (based on PGF bullseye) of the PGF and obtain client acceptance.
Slack off on the crane and lay the PGF lift rigging over the rigging guide bar.
ROV to disconnect the pennant hook from the PGF lifting rigging rigging.
Recover the deployment pennant to deck.
ROV to recover the two beacons before pile driving and store it in work basket or ROV storage drawer

PGF Repositioning

Status

· HIRA has been reviewed and the mitigation actions been put in place as per document no: 11011-AMC-HESS-RM-RA-1301 Project Hazard Identification and Risk Analysis (HIRA)
· Toolbox talk has been conducted with all personnel to be involved in the operation.
· Offshore weather forecast has been reviewed and actual weather condition is still inside limiting seastate to do intended operation. All parties agreed to proceed with consideration to actual weather condition. Refer to Section 1.12 Table 1 for Limiting Seastate
· The main hoist on the LCR main crane is reeved with the configuration of 5 falls SWL 220mt @ max. 42m, hook travel 168m
· PGF target area is surveyed and the Client Representative is notified of any seabed anomalies identified (Refer to Sub Task #0.4)
· All subsea assets and the design locations of the piles and the corridors for the mooring chains are displayed on the vessel navigation screen.
· The PGF target box of 25m x 25m for each pile shall be displayed on the navigation screen along with the design position of the PGF footprint.

ROV to visually inspect the PGF for any anomalies such as rigging, etc (to be confirm with hammer spread vendor)
During the time between pile driving and PGF repositioning, beacons will be store at work basket / ROV storage drawer. ROV to install back the two beacons to PGF beacon bucket. Proposed beacon holders are long enough to sufficient keep the beacon in place, thus no need tied down the beacon to the bucket itself. Reference: 11011-AMC-INT-ME-DW-4025 ROV Docking Pipe & Beacon Holder Details
Deploy the crane stinger with the PGF lift pennant to the PGF. Transponder will be attached to the PGF lift pennant to indicate the pennant position. Note: Zero the crane pay out meter when the ROV hook on the pennant touches the water surface.
Manoeuvre LCR as required bringing the 250MT ROV hook on the pennant close to the master link on the PGF lift rigging. There will be 2 Masterlinks, one for every pair of PGF sling
ROV to make connection between the pennant 250MT ROV hook and the master link on the PGF lift rigging. Reference:
11011-AMC-INT-ME-DW-1003 Pile Guide Frame Deployment
11011-AMC-INT-ME-DW-1031 Deployment Stinger Arrangement for Huisman Main Block
11011-AMC-INT-ME-DW-1010 Pile Guide Frame Deployment and Recovery Pennant Arrangement
11011-AMC-INT-ME-DW-1011 Pile Guide Frame Lift Rigging Arrangement
After 250T ROV hook connected to the PGF lifting rigging, Crane takes the slack and stand up the rigging.ROV to check the rigging. Check lifting arrangement based on actual plan and signed the lifting plan. Gradually increase the tension in the PGF lift rigging to break seabed suction until the frame lifts off seabed (step on every 20T). Record max. Hook load at crane hook after PGF break from seabed suction and hold it. Note: Apply gradual tension on the crane wire in 20T interval tension until the “breakout force” is overcome. The SWL of the rigging is 200MT. If the crane wire reaches before 200MT tension and the seabed suction could not be still overcome, then refer to the Sub-task #1.4 for contingency recovery procedure. Limiting seastate for PGF repositioning is H_S=1.0m. Reference:
11011-AMC-INT-ME-DW-1011 Pile Guide Frame Lift Rigging Arrangement
Lift the pile guide frame to10m above seabed. Note: Max. expected load at crane hook is 178MT submerged weight (include DAF). PGF target location approximately 25m from barge stern (10m from edge of PGF), it will give crane capacity 202MT on 38m radius. B2 and LCR can move forward to give better capacity on crane during repositioning of PGF if required
LCR to transit to the next pile location with the PGF hanging subsea 10m above seabed. Note: Communication between SS, DF, ROV,and Brdige to ensure smooth repositioning of PG. Ensure that the transit speed is no more than 0.5 Knots or lower depends site condition. DF and crane operator to monitor the swing load on the crane during re-positioning
Repeat Sub-Task#1.2 for PGF re-positioning activities.

PGF Recovery

Status

Connect the PGF deployment pennant to the crane stinger on the block on the main crane. Reference:
11011-AMC-INT-ME-DW-1003 Pile Guide Frame Deployment
11011-AMC-INT-ME-DW-1031 Deployment Stinger Arrangement for Huisman Main Block
11011-AMC-INT-ME-DW-1010 Pile Guide Frame Deployment and Recovery Pennant Arrangement
11011-AMC-INT-ME-DW-1011 Pile Guide Frame Lift Rigging Arrangement
ROV to visually inspect the PGF for any anomalies such as rigging, etc (to be confirm with hammer spread vendor).
Deploy the crane stinger with the PGF lift pennant to the PGF. Transponder will be attached to the PGF lift pennant to indicate the pennant position. Note: Zero the crane pay out meter when the ROV hook on the pennant touches the water surface.
Manoeuvre LCR as required bringing the 250MT ROV hook on the pennant close to the master link on the PGF lift rigging. There will be 2 Masterlinks, one for every pair of PGF sling.
ROV to make connection between the pennant 250MT ROV hook and the master link on the PGF lift rigging. Reference:
11011-AMC-INT-ME-DW-1003 Pile Guide Frame Deployment
11011-AMC-INT-ME-DW-1031 Deployment Stinger Arrangement for Huisman Main Block
11011-AMC-INT-ME-DW-1010 Pile Guide Frame Deployment and Recovery Pennant Arrangement
11011-AMC-INT-ME-DW-1011 Pile Guide Frame Lift Rigging Arrangement
After 250T ROV hook connected to the PGF lifting rigging, Crane takes the slack and stand up the rigging.ROV to check the rigging. Check lifting arrangement based on actual plan and signed the lifting plan. Gradually increase the tension in the PGF lift rigging to break seabed suction until the frame lifts off seabed (step on every 20T). Record max. Hook load at crane hook after PGF break from seabed suction and hold it.
Note: Apply gradual tension on the crane wire in 20T interval tension until the “breakout force” is overcome.
The SWL of the rigging is 200MT. If the crane wire reaches before 200MT tension and the seabed suction could not be still overcome, then refer to the Sub-task #1.4 for contingency recovery procedure.
Limiting seastate for PGF repositioning is H_S=1.0m.
Reference:
11011-AMC-INT-ME-DW-1011 Pile Guide Frame Lift Rigging Arrangement
Lift the pile guide frame to 10m above seabed.
Max. expected load in air 136MT (include DAF)
Max. expected load in water 178MT (include DAF)
Crane capacity : 220MT and 202.4MT with radius 24.5m and 38m respectively
LCR can position herself to give better capacity on crane during recovery of PGF if required
Move clear PGF from subsea asset
Haul in on the crane to recover the PGF. Land it on the B2 at the planned location. Planned location shall be using the same area during PGF mobilisation. Reference: 11011-AMC-INT-ME-DW-1002 Cargo Barge #2 (PGF, Winch, Windlass and Mattresses) Layout
Lay down PGF lifting arrangement to B2 deck to ease of disconnect of crane stinger from PGF lifting rigging. Disconnect the crane stinger from the PGF lift rigging.
Put in place all the PGF seafastenings. Reference:
11011-AMC-INT-ME-DW-1002 Cargo Barge #2 (PGF, Winch, Windlass and Mattresses) Layout
11011-AMC-HESS-ME-RA-3113 B2 Transportationand Tie-Down Design Report (PGF, Mattresses, Winch and Windlass)

PGF Contingency Recovery

Status

· HIRA has been reviewed and the mitigation actions been put in place as per document no: 11011-AMC-HESS-RM-RA-1301 Project Hazard Identification and Risk Analysis (HIRA)
· Toolbox talk has been conducted with all personnel to be involved in the operation.
· Offshore weather forecast has been reviewed and actual weather condition is still inside limiting seastate to do intended operation. All parties agreed to proceed with consideration to actual weather condition. Refer to Section 1.12 Table 1 for Limiting Seastate
· The main hoist on the LCR main crane is reeved with the configuration of 5 falls SWL 220mt @ max. 42m, hook travel 168m
· PGF target area is surveyed and the Client Representative is notified of any seabed anomalies identified. (Refer to Sub Task #0.4)
· All subsea assets and the design locations of the piles and the corridors for the mooring chains are displayed on the vessel navigation screen.
· The PGF target box of 25m x 25m for each pile shall be displayed on the navigation screen along with the design position of the PGF footprint.

Slack off on the main crane and lay the PGF lift rigging over the rigging guide bar.
ROV to disconnect the pennant hook from the PGF lifting rigging.
Reference:
11011-AMC-INT-ME-DW-1031 Deployment Stinger Arrangement for Huisman Main Block
11011-AMC-INT-ME-DW-1010 Pile Guide Frame Deployment and Recovery Pennant Arrangement
11011-AMC-INT-ME-DW-1011 Pile Guide Frame Lift Rigging Arrangement
Slew the crane as required to bring the ROV hook close to one of the pair of lifting rigging on the PGF under ROV instruction Note: There be 3 pairs of lifting slings (2 pairs of 2 legs 14m wire and 1 pair of 2 legs 18m wire, which can be used for recovery of PGF
Reference: 11011-AMC-INT-ME-DW-1011 Pile Guide Frame Lift Rigging Arrangement
Bring the ROV hook to the 18m wire PGF lifting sling. The configuration of 14m wire and 18m wire will make 5degree lifting of PGF
Haul-in on the main crane until the seabed suction on the PGF being lifted is overcome. Monitor the tension on the crane wire required to overcome the suction.
Once the one section of PGF is free, lower it down slowly and slack off the lift rigging.
Repeat steps 5 & 6 above a few more times until the tension required to overcome the suction on that leg is reduced compared to the first lift
ROV to disconnect the lift rigging from ROV hook on the crane pennant.
Proceed with activities in Sub Task #1.3 and 1.4 (as suitable) to recover the PGF from seabed.

Pile Follower 1 Upending, Hang Off and Lay down

General

This section covers the pile follower upending and hang-off operations. The pile follower will be picked up from the piles and chain barge B1, upended and hung off on the LCR stern starboard side. The hang off frame will be the temporary storage location for the follower. There will be additional lay down area for pile follower on LCR due to necessity to do NDT test for pile follower after each pile driving operation.

Pile Follower Detail

Length (m)	Pile Interface Diameter (in)	Hammer Interface Diameter (in)	Weight in air (MT)	Position of Trunnion from Top of follower (m)
14.5	77	50	32.5	3.175

Lift Information

Parameter	Value	Unit
Weight in air	32.5	MT
Rigging Weight in air	0.45	MT
Total Lift Weight in air (include 3% contingency factor)	33.94	MT
On board lifting Max Hook load (30% DAF)	44.12	MT
Max Load on each crane (45:55 split)	24.27	MT
Max. Load on one crane (single lifting)	44.12	MT

Operational Parameters

There is no heading restriction for LCR during follower upending and hang off operations. Orientate LCR along the most favourable heading to wind and waves.

During worst current condition, there will be a gap 200mm between pile follower and LCR hull. There will be stopper that prohibited pile follower to touch LCR hull

Reference Drawings

Following procedure drawings are to be referred to along with this task

P956-85-DWG-U-02149-02 Anchor Pile Follower GA
11011-AMC-INT-ME-DW-4017 Pile Follower Mod: Add. Trunnion Layout and Section
11011-AMC-INT-ME-DW-3001 LCR Deck Layout
11011-AMC-INT-ME-DW-1001 Cargo Barge #1 (Anchor Piles, Mooring Chains and Pile Follower) Layout
11011-AMC-INT-ME-DW-1005 Pile Follower Upending and Hang Off Sequence
11011-AMC-INT-ME-DW-1013 Pile Follower Upending Rigging and Lift Rigging Arrangement
11011-AMC-INT-ME-DW-1031 Deployment Stinger Arrangement for Huisman Main

Block

11011-AMC-HESS-MO-KA-2202 Transfer of Personnel
11011-AMC-HESS-HE-RA-3112 Transportation and Tie Down Design Report (Anchor Pile, Mooring Chain and Pile Follower)

Transfer of Pile Follower from B1 to LCR

Status

· HIRA has been reviewed and the mitigation actions been put in place as per document no: 11011-AMC-HESS-RM-RA-1301 Project Hazard Identification and Risk Analysis (HIRA)
· Toolbox talk has been conducted with all personnel to be involved in the operation.
· Offshore weather forecast has been reviewed and actual weather condition is still inside limiting seastate to do intended operation. All parties agreed to proceed with consideration to actual weather condition. Refer to Section 1.12 Table 1 for Limiting Seastate
· The main hoist on the LCR main crane is reeved with the configuration of 5 falls SWL 220mt @ max. 42m, hook travel 168m
· Pile follower hang off frame has been installed on the LCR stern side (Refer to drawing 11011-AMC-INT-ME-DW-3001 LCR Deck Layout) during the LCR mobilisation in Pasir Gudang
· B1 with the anchor piles, pile follower and mooring chains moored on the port side of LCR (Refer to drawing 11011-AMC-INT-ME-DW-1005 Pile Follower Upending and Hang Off Sequence and 11011-AMC-INT-ME-DW-1001 Cargo Barge #1 (Anchor Piles, Mooring Chains and Pile Follower) Layout
· Pile follower horizontal lifting sling has been rig-up during the B1 loadout (Refer to drawing 11011-AMC-INT-ME-DW-1013 Pile Follower Upending Rigging and Lift Rigging Arrangement)
· Pile follower lay down area on LCR as described in 11011-AMC-INT-ME-DW-3001 LCR Deck Layout

Position the B1 on the portside of LCR and transfer riggers to B1. There will be riggers on LCR for to be assigned to do the upending of pile follower.

B1 stern side shall be 7m protruding from LCR stern side. Tied B1 alongside LCR and transfer intended personnel to B1. Reference :
11011-AMC-INT-ME-DW-1005 Pile Follower Upending and Hang Off Sequence
11011-AMC-HESS-MO-KA-2202 Transfer of Personnel
Remove all seafastenings from the follower 1
Reference:
11011-AMC-INT-ME-DW-1001 Cargo Barge #1 (Anchor Piles, Mooring Chains and Pile Follower) Layout
11011-AMC-HESS-ME-RA-3112 B1 Transportation and Tie-Down Design Report (Anchor Pile, Mooring Chain and Pile Follower)
Connect horizontal lifting rigging for pile follower 1 to main crane using main block. Note: tag lines will always be use during lifting operation. Reference: 11011-AMC-INT-ME-DW-1013 Pile Follower Upending Rigging and Lift Rigging Arrangement
Transfer pile follower 1 from B1 to LCR starboard side Note : Approx 44MT Air Weight (include DAF) Crane capacity 125MT at 51.32m radius
Reference:
11011-AMC-INT-ME-DW-1005 Pile Follower Upending and Hang Off Sequence
11011-AMC-INT-ME-DW-1013 Pile Follower Upending Rigging and Lift Rigging Arrangement
11011-AMC-INT-ME-DW-3001 LCR Deck Layout
Lay down pile follower 1 to lay down area at starboard of LCR Note: LR deck will be protected with steel plate and wood on pile follower lay down area. Reference: 11011-AMC-INT-ME-DW-3001 LCR Deck Layout

Pile Follower Upending and Hang-Off

Status

The stabbing guide on the follower is choked with the upending sling. Pile follower trunnions will be connected with vertical lift sling. Reference:
11011-AMC-INT-ME-DW-1005 Pile Follower Upending and Hang Off Sequence
11011-AMC-INT-ME-DW-1013 Pile Follower Upending Rigging and Lift Rigging Arrangement
11011-AMC-INT-ME-DW-3001 LCR Deck Layout
Option 1 :Connect the Huisman main block to the vertical lift sling on the pile follower trunions and the MacGregor to the upending sling on the stabbing guide of the follower. Tag lines to be installed on Pile follower. Reference :
11011-AMC-INT-ME-DW-1005 Pile Follower Upending and Hang Off Sequence
11011-AMC-INT-ME-DW-1013 Pile Follower Upending Rigging and Lift Rigging Arrangement
11011-AMC-INT-ME-DW-3001 LCR Deck Layout
Lift both the cranes to take out any slack in the rigging and lift from deck approx. 1m
Note : Approx 44MT Air Weight (include DAF)
Huisman crane capacity 220MT at 19.38m radius
MacGregor crane capacity 105MT at 16.62m radius
Limiting seastate for Pile Follower Upending and Hang Off is H_S=1.5m.
While holding the load on the MacGregor crane, come up on the Huisman main crane to upend the pile follower.
Slack off on the stbd crane and remove upending sling from the follower.
Option 2 :Connect the Huisman main block to the vertical lift sling on the pile follower trunions. Tag lines to be installed on Pile follower. Reference :
11011-AMC-INT-ME-DW-1005 Pile Follower Upending and Hang Off Sequence
11011-AMC-INT-ME-DW-1013 Pile Follower Upending Rigging and Lift Rigging Arrangement
11011-AMC-INT-ME-DW-3001 LCR Deck Layout
Lift Huisman crane slowly to upending the Pile Follower 1
Note : Approx 44MT Air Weight (include DAF)
Huisman crane capacity 220MT at 19.38m radius
LCR deck has been covered by plate and wood (as required)
Limiting seastate for Pile Follower Upending and Hang Off is H_S=1.5m.
Slew the main crane towards the hang off frame on the stern side of LCR
Overboard and lower down the pile follower outside of the Pile hang-off platform
When the bottom trunnion almost the same height with top of the trunnion saddle, bring in pile follower to the pile follower hang-off frame via Pile hang-off frame side opening.
Align the follower trunions with the trunion guides on the hang off frame and land the follower on the hang off frame. Note: upending sling has to be positioned between trunnion saddle and end of pile follower trunnion. There will be a stopper plate to stop the wire.
Secure the follower to the hang off frame as required to avoid tipping over (ie: endless chain will be use to tied down pile follower trunnion to tie down pile hang-off platform) as required.
Disconnect main crane from vertical lift sling on the follower trunion

Pile Follower Lay down

Status

After hammer completely disconnect from pile follower and store at hammer frame, connect Huisman main block to vertical lift sling on the follower trunnion
Pile follower vertical lifting sling has been rig-up (Refer to drawing 11011-AMC-INT-ME-DW-1013 Pile Follower Upending Rigging and Lift Rigging Arrangement)
Release any follower securing point to the hang-off frame (ie: endless chain will be use to tied down pile follower trunnion to tie down pile hang-off platform)
Haul in main crane to take out any slack in the rigging
Lift the pile follower from trunnion saddle until bottom of trunnion height is slightly more than top of the trunnion saddle
Bring out the pile follower from Pile hang-off frame side opening.
After pile follower free from pile follower hang-off frame, continue haul in on main crane to lift the follower until pile follower above water level
Slew the main crane towards the pile follower lay down area at LCR starboard side
Lower down bottom of the pile follower and rest the bottom of the pile follower on LCR deck.
Note: LCR deck has been covered by steel plate and wood as required.
Lay down the follower
After pile follower lay down, secure accordingly
Disconnect main crane from vertical lift grommet on the follower
NDT for follower no. 1
Repeat Sub-Task #2-2 for Pile Follower 2 upending and hang-off
Two followers will be used alternatively to drive the piles as the follower will be retrieved after driving each pile

Mooring Pile Installation

General

This section covers the mooring pile upending, over boarding, and stabbing into the PGF operations. The mooring piles are marked with specific identification numbers 1, 2, etc. The mooring piles also have depth markings along its length to monitor the pile penetration. The depth markings start at 0m from the bottom of the pile and continue to the top at every 1m. The top and the bottom of the pile, and above and below padeye are marked with a 100mm wide band around the outer circumference of the anchor pile. The location of the padeye is also marked with a longitudinal straight line on the pile.

The piles will be installed in a sequence starting from the centre of the B1 and then moving out to the portside and starboard side to maintain the B1 stability in the sequence identified on the B1 layout. The marking numbers and purposely marks on the pile is only for ID purpose and do not correspond to pile locations. The sequence of pile locations to be installed will be started from no. 3, 2, 1, 9, 8, 7, 6, 5, 4 as per drawing no: 11011-AMC-INT-ME-DW-1009 Mooring Chain laydown and layout arrangement drawing, but the sequence will depends to weather condition at site.

The mooring chains of each mooring leg will be pre-connected to the respective piles. The piles will have to be upended with the ILT. The pile will be upended from bow to stern of the B1. There is pile upending stopper at the centre of the B1 barge to help to upended the pile. To ensure the main crane has sufficient hook height for upending, it will be required to transfer the pile to center of the barge, This is required to be done to ensure that the crane has sufficient lift capacity and hook height required for the upending operation.

The upending pile will be done in the lifting arrangement as below:

Crane Angle (°)	Hook Height (m)	Crane Radius (m)	Crane Capacity (MT)
17.23	62.208	28.91	220

Refer to drawing 11011-AMC-INT-ME-DW-1001 Cargo Barge #1 (Anchor Piles, Mooring Chains and Pile Follower) Layout for deck layout for B1.

Installation Tolerance

Positioning of Pile

The specification for the positioning tolerance of piles is +/-5.0m.

Vertically Piles

The specification for the verticality of piles is +/- 2⁰ measured by means of the bullseye on the PGF.

Orientation of Piles

The specification for heading orientation of piles is +/- 2⁰measured by the orientation of the pile guide frame.

Penetration of Piles

The specification for the pile penetration is -0/+0.5m. The piles and the pile followers are graduated to measure penetration. The piles and pile Follower will be marked with paint in every 0.25m and 1m. When the piles are driven to the target depth the pile follower will be within the PGF. The PGF top funnel is at an elevation of 5.07m from the bottom of mudmat base plate. Assuming the PGF does not sink into the seabed, when the final pile penetration is achieved (0.5m pile stick-up), the PGF top entry funnel level shall be between the 44m and 45m mark on the follower[ON-HOLD]. If the PGF does sink to the seabed, ROV will do the closer observation to determine the depth of penetration of PGF sink to the seabed and if possible to take a closer look to determine the penetration of the piles itself. Refer drawing P956-85-DWG-U-02149-02, ‘Anchor Pile Follower GA’ presented in Appendix A and Pile Driving 11011-AMC-INT-ME-DW-1006 presented in Appendix B

Mooring Analysis Result

The splash zone analysis shows that snap loads and resonant amplification in the crane wire are not expected. A DAF of 1.02 was obtained, at which the crane capacity utilization will be 75% (139 Te out of 184 Te), eventhough in calculation, 30% DAF will still be used. Therefore, lifting load while lowering the pile through splash zone will be within the crane lifting capacity

Pile Details

Nominal Length (m)	Diameter (in)	Weight in air (MT)	Position of Padeye from Top of Pile (m)	Pile Stickup above Seabed (m)
40	82	102	10	0 – 0.5

Pile Heading and Coordinate

Description	Heading (deg) wrt North (measured clockwise)	Easting (m)	Northing (m)
Pile #1	62.5°	302 846.79	775 264.50
Pile #2	67.5°	302 869.49	775 215.82
Pile #3	72.5°	302 887.86	775 165.35
Pile #4	182.5°	302 290.47	774 386.82
Pile #5	187.5°	302 236.96	774 391.50
Pile #6	192.5°	302 184.07	774 400.82
Pile #7	302.5°	301 808.54	775 307.45
Pile #8	307.5°	301 839.34	775 351.44
Pile #9	312.5°	301 873.87	775 392.58

Lift Information

Pile Deployment

Parameter	Value	Unit
Weight in air	102	MT
ILT and 75m of ground chain Weight	37.7	MT
Rigging Weight in air	1.3	MT
Total Lift Weight in air (including 3% contingency factor)	145.2	MT
Total Submerged Lift Weight (including 3% contingency factor)	126.3	MT
On board lifting Max Hook load (20% DAF)	174.2	MT
Subsea lifting Max Hook load (30% DAF from submerged weight)	164.2	MT

Pile Self-Penetration

Case	Minimum (m)	Maximum (m)
Pile Only	2.3	13.4

Operational Parameters

There is no heading restriction for LCR during mooring piles upending and overboarding. Orientate LCR along the most favourable heading to wind and waves. However, prior to pile stabbing into the PGF, B1 chain windlass shall be aligned along the mooring leg lay route with the B1 bow towards the mooring centre. The tolerance for chain laying will be +/-15m

Allowable chain twist during installation is 5⁰ per link. Chain twist can be monitored visually by paint marking on every other link.

Preparation for Mooring Piles Overboarding

Status

· HIRA has been reviewed and the mitigation actions been put in place as per document no: 11011-AMC-HESS-RM-RA-1301 Project Hazard Identification and Risk Analysis (HIRA)
· Toolbox talk has been conducted with all personnel to be involved in the operation.
· Offshore weather forecast has been reviewed and actual weather condition is still inside limiting seastate to do intended operation. All parties agreed to proceed with consideration to actual weather condition. Refer to Section 1.12 Table 1 for Limiting Seastate
· The main hoist on the LCR main crane (Huisman) is reeved with the configuration of 5 falls SWL 220mt @ max. 42m, hook travel 168m
· B1 with the anchor piles, pile follower and mooring chains moored on the port side of LCR (Refer to drawing 11011-AMC-INT-ME-DW-1004 Mooring Pile Upending and Overboarding and 11011-AMC-INT-ME-DW-1001 Cargo Barge #1 (Anchor Piles, Mooring Chains and Pile Follower) Layout
· PGF positioned at the design pile location on the seabed.
· Pile follower is secured on the hang off frame on LCR stern
· Mooring chain is pre-connected to the mooring pile padeye via special anchor shackle.
· One side of alternate chain links are marked with white or yellow paint for twist monitoring during laying.
· The winch wire is marked at every 10m from the end (which has been done during the spooling of the wire onshore)
· Chain seafastenings ( at the end of the each chain end and inner side stanchions) must be cut prior of mooring pile overbording

Offset from GPS antenna to the B1 chain windlass is measured and input in the vessel navigation system (Position and heading of the cargo barge will also be displayed relative to LCR. Cargo barge position and heading will be plotted on survey screen on LCR bridge for Survey Team, OCM and LCR master to monitor the position). This will be done using computer aided program to determine the location of chain windlass since LCR has been plotted on survey screen and survey team will have data for each vessel (LCR and cargo barge) Note: the B1 stern is protruding 7m compare to LCR stern. The target pile lowering position is 10m from B1 stern. Reference:
11011-AMC-INT-ME-DW-1004 Mooring Pile Upending and Overboarding
11011-AMC-INT-ME-DW-1001 Cargo Barge #1 (Anchor Piles, Mooring Chains and Pile Follower) Layout
Confirm with FE which pile will be overboarded first. Note: the sequence will be pile from the centre of the B1 and then moving out to the portside and starboard side to maintain the B1 stability. Portside and Starboard side pile have to be relocate to center of the barge for upending operation. Use Pile horizontal lifting rigging arrangement as per drawing no: 11011-AMC-INT-ME-DW-1014 to relocate the pile. Note: Approx 141MT for horizontal lift of pile in air Crane capacity 152MT at 44.7m radius ( biggest crane radius to reach). Sign lifting plan prior to lifting of pile
The sequence of pile locations to be installed will be started from no. 3, 2, 1, 9, 8, 7, 6, 5, 4 as per drawing no: 11011-AMC-INT-ME-DW-1009 Mooring Chain laydown and layout arrangement drawing, but the sequence will depends to weather condition at site.
Ensure the mooring components identification are documented by FE and photographs taken. Client Representative on board and the third parties (MWS, Class) to witness the anchor shackle connection to the pile include the ID for each item on mooring system
Take out seafastening at the end of the pile for pile to to be overboarded on upending side. Refer to drawing no: 11011-AMC-INT-ME-DW-1001 Cargo Barge #1 (Anchor Piles, Mooring Chains and Pile Follower) Layout
Check the communications between LCR and the personnel on the B1

Overboarding of Mooring Pile and stabbing to PGF

Orientate LCR along the most favourable heading to wind and waves.
Install a transponder (mini-beacon) onto crane stinger to assist with subsea positioning operations. Record ID for beacons. Transponder will be tie down using PP Rope and Duct Tape which will be wrap and tied to crane stinger.
Pick up the ILT with the crane main block. ILT hoses will be handled by aux block. Used hose saddle (provided by Menck) for handling of the ILT hose. Zero out the crane load monitor or alternatively record the tension on the crane to know the rigging weight. Note: Approx 23MT air weight (include DAF)
Stab the ILT into the top of the pile and activate the ILT
15T winch wire will be used to assist during ILT insertion to the pile.
15T winch wire can be connected to the padeye in front of the ILT
Reference:
11011-AMC-INT-ME-DW-1004 Mooring Pile Upending and Overboarding
P956-85-DWG-U-02147 Anchor Pile GA
P956-85-DWG-U-02148 Anchor Pile Details
Using 15T Winch on the barge B1 take bite on the chain. Note: to take side load of chain during pile upending, assume 45m of chain = 12T
Gradually come up on the crane to take out any slack in the rigging. Note: Limiting seastate for Mooring Pile Upending is H_S=1.5m.
Gradually come up on the crane to lift the pile ~3m off the B1 deck. Note: There is pile upending stopper for helping to upended the pile. Approx 174.2MT air weight (include DAF). Crane capacity 220MT with radius 28.91m. Sign lifting plan checklist prior to upending of pile
Slew the main crane towards the B1 stern to overboard the pile. Ensure that the pile is clear off from the B1 stern and the chain is running aligned to chain guide stopper (need to be in open position) and running over the chain windlass on the B1. Lower the pile until the bottom of pile in the water to stabilize the system After chain aligned and engaged on chain windlass, close the chain guide stopper to ensure chain will not jump out from chain windlass. (35T winch will be used to adjust the chain sitting on the windlass, if the chain doesn’t sit properly on the windlass). Note: Zero the crane payout meter when the pile bottom touches the waterline. Approx 164.2MT submerged weight (include DAF 30%). Crane capacity 184.6MT with radius 40.56m
Pay out on the crane to lower the pile top below the splash zone. ROV to locate the chain catenary and ensure that there is always enough slack in the chain. Note: Payout on the chain windlass as required to keep the chain catenary slack.
Lower pile through the water column until the pile bottom is 5m above the top of the PGF by paying out on crane in steady speed. Payout on the chain with the chain windlass as required to give enough slack of chain, approx. 40m of chain. Note: Limiting seastate for Anchor Pile lowering is H_S=1.5m.
ROV to confirm the elevation at the bottom of the pile. ROV observe shackle location on pile and ensure 5m of chain is hanging down from the pile padeye. ROV to ensure that the chain catenary is maintained slack throughout pile stabbing operation
Under ROV instruction, gradually lower the pile and position the pile 1m above the entry funnel of the PGF within the periphery of the entry funnel. Windlass payout chain another 5m (in total approx. 45m chain)
ROV to confirm that the orientation fin on the pile is within the envelope marked on the PGF funnel. ROV monitor to shown the picture of above situation Note:
The orientation guides within the PGF and the orientation key plate on the pile ensure that the pile is orientated in line with the PGF heading. Reference :
P10046-A001-02 Pile Guide Frame GA
11011-AMC-INT-ME-DW-4017 Anchor Pile Key Plates Arrangement and Details
11011-AMC-INT-ME-DW-1006 Hammer and Pile Deployment Sequence
Once ROV confirms that the pile orientation fin is within the entry envelope of the PGF, pay out chain and ILT umbilical to cover max penetration. Crane wire comes down in full speed and keep coming until crane rigging is slack. Note:
Payout on the chain windlass as required to ensure 5m of chain is hanging down from the pile padeye.
Crane wire keep lowering the pile on max speed to compensate the heave and pile penetration
Keep paying out on the crane, 35MT winch and the ILT hoses in increments of 3m until the crane load monitor reads zero load or the weight of the rigging only implying the self-penetration has completed. Alternatively, ROV to monitor the orientation of the lift shackle on the ILT. If it is upright, it implies it is still holding the weight of the ILT and if it is lying at an angle, implies that the self-penetration has completed. Note:
· The self-penetration of the piles is expected to be between 2.3 – 13.4m
· Survey shall continuously monitor the position & orientation of the PGF during pile installation and self-penetration.
· The total chain to be pay out should be between 52m – 63m
Once the pile penetration stops, payout additional 5m on the crane wire and on the chain and monitor pile for 2 minutes to ensure the completion of self-penetration. Reference: 11011-AMC-INT-ME-DW-1004 Mooring Pile Upending and Overboarding
ROV to read the pile marking on the seabed to estimate pile self-penetration. Alternatively, if the visibility on the seabed is poor, ROV to read the pile marking coinciding with the sleeve on the PGF to estimate self-penetration of the pile.
Record the self-penetration of the pile on the relevant record sheet. Reference: 11011-AMC-INT-ME-DW-1004 Mooring Pile Upending and Overboarding
Release the pressure on the ILT and recover the ILT to LCR deck. Refer to Appendix D for ILT contingency plan

Hammer Upending and Pile Driving

General

This section covers the hammer upending, assembling hammer with the follower, stabbing the follower into the pile and driving the pile to design depth operations. The follower has depth markings along its length to monitor the pile penetration. The depth markings start from the base of the follower stabbing guide and are a continuation of the pile depth markings extended to the top of the follower at every 250mm. At every metre a number corresponding to the depth is also marked to ease reading the pile penetration.

Since the stabbing guide on the follower will penetrate into the seabed during pile driving, a soil plug may potentially be formed inside the follower.

Hammer Details

Length (m)	Sleeve inner Diameter (in)	Weight in air (MT)
12.4	60” suitable to 50” OD follower	32.5

Lift Information

Parameter	Value	Unit
Weight in air (hammer + follower)	84.8	MT
Rigging Weight in air (include spreader bar)	4.65	MT
Max Soil Plug Weight in air. (density of soil 1.75MT/m³)	8.75	MT
Max Soil Plug Submerged Weight	3.5	MT
Total Lift Weight in air (including 3% contingency factor)	100.74	MT
Total Submerged Lift Weight (including 3% contingency factor)	87.61	MT
On board lifting Max Hook load (30% DAF)	131.00	MT
Subsea lifting Max Hook load (60% DAF)	140.18	MT

Pile Self-Penetration

Case	Minimum (m)	Maximum (m)
Pile Only	2.3	13.4
Pile + Follower + Hammer	5.2	18.9

Pile Driving Parameters

Pile driving refusal is defined as the point where pile driving resistance exceeds either:

300 blows per foot (0.3m) for five consecutive feet (1.5m)
800 blows per foot (0.3m) of penetration.

If there has been a delay in pile driving operations for one hour or longer, the above shall not apply until the pile has been driven at least 1 foot (0.3m) following resumption of pile driving.

Operational Parameters

Since the mooring chain catenary is connected to the pile and suspended from the B1 deck, it is important to maintain the heading of the B1 with the chain windlass along the mooring leg lay route and the bow towards the mooring center throughout the pile driving operation. The tolerance for chain laying will be +/-15m

Allowable chain twist during installation is 5⁰ per link. Chain twist can be monitored visually by paint marking on every other link.

Hammer Upending and Lifting to Pile Follower Hang-Off Frame

Status

· HIRA has been reviewed and the mitigation actions been put in place as per document no: 11011-AMC-HESS-RM-RA-1301 Project Hazard Identification and Risk Analysis (HIRA)
· Toolbox talk has been conducted with all personnel to be involved in the operation.
· Offshore weather forecast has been reviewed and actual weather condition is still inside limiting seastate to do intended operation. All parties agreed to proceed with consideration to actual weather condition. Refer to Section 1.12 Table 1 for Limiting Seastate
· The main hoist on the LCR main crane (Huisman) is reeved with the configuration of 5 falls SWL 220mt @ max. 42m, hook travel 168m
· B1 with the anchor piles, pile follower and mooring chains moored on the port side of LCR (Refer to drawing 11011-AMC-INT-ME-DW-1004 Mooring Pile Upending and Overboarding and 11011-AMC-INT-ME-DW-1001 Cargo Barge #1 (Anchor Piles, Mooring Chains and Pile Follower) Layout
· PGF positioned at the design pile location on the seabed.
· Pile follower is secured on the hang off frame on LCR stern
· Mooring pile is stabbed into the PGF and pile self-penetration is completed.
· One side of alternate chain links are marked with white or yellow paint for twist monitoring during laying.
· The winch wire is marked at every 10m from the end (which has been done during the spooling of the wire onshore)
· Chain seafastenings ( at the end of the each chain end and inner side stanchions) must be cut prior of pile driving

Connect the hammer follower assembly rigging including the spreader bar to the padeyes on the hammer , leaving the follower ends free. Note : hoses connected only 40m hoses and being lifted up by the aux hook. Reference: 11011-AMC-INT-ME-DW-1044 Rigging Arrangement for Handling of Hammer and Pile Follower with Spreader Bar
Install a transponder (mini-beacon) onto crane stinger to assist with subsea positioning operations. Record beacon ID. Transponder can be tie down to crane using transponder bucket which will be wrap and tied to crane stinger.
Zero out the crane load monitor or alternatively record the tension on the crane to know the rigging weight.
Connect the main crane stinger to the hammer lift rigging. Tag lines connected to the hammer. Reference: 11011-AMC-INT-ME-DW-1044 Rigging Arrangement for Handling of Hammer and Pile Follower with Spreader Bar
Come up on the main crane and slew as required to upend the hammer about the trunnions on the sleeve. Note:
Approx 70MT air weight (include DAF)
Crane capacity 220T at 23.19m radius
Sign lifting plan checklist prior to upending of pile
Limiting seastate for Hammer upending is H_S=1.5m.
Reference: 11011-AMC-INT-ME-DW-1006 Hammer and Pile Deployment Sequence
Slew the crane towards the hang off frame on LCR stern side.
Note:
Ensure the hammer hoses are slack enough and do not get snagged with any object on the deck.
Lifting direction shall not be through riser reel direction.
Gradually lower the hammer sleeve over the follower.
Connect the free ends of the hammer follower assembly rigging to the trunnions padeye on the follower. Reference:
11011-AMC-INT-ME-DW-1044 Rigging Arrangement for Handling of Hammer and Pile Follower with Spreader Bar
After hammer and pile follower connected, Bring back hammer and pile follower assembly to hammer upending cradle position. Lower down the aux block which handle the hoses. Connected balance of hoses to the 40m hoses.Hammer and pile follower prepare to subsea deploy

Assembly of Hammer and Pile Follower Overboarding and Stabbing into The Pile

Ensure the hammer hoses re sufficiently slack and enough people to handle the hoses
Haul-in on the crane until bottom of pile follower trunnion slight free from top of the pile follower saddle. Boom down as required to bring the hammer-follower assembly out of the pile follower hang-off frame from side opening. Note: +/- 131MT air weight and 140.2MT submerged weight (included DAF). Crane capacity 220MT at 22.31m radius during overboarding and 184.6MT at 40.56m radius during lowering. Limiting seastate for Hammer and Pile Follower Assembly overboarding is H_S=1.5m. Sign lifting plan checklist prior to upending of pile. Reference:· 11011-AMC-INT-ME-DW-1006 Hammer and Pile Deployment Sequence
Lower down the hammer-follower assembly at the pile location by paying out on the crane until the bottom of the follower is ~2m above the pile top. Note:
· Zero the crane payout meter when the bottom of the pile follower touches the waterline.
· Deploy, ROV to monitor the hammer/follower assembly descent through the water column and confirm the depth between the follower bottom and the pile top. Reference: 11011-AMC-INT-ME-DW-1006 Hammer and Pile Deployment Sequence
Under ROV Instruction, adjust the crane boom and slew angle as required to centralize the follower stabbing guide with the pile. Reference: 11011-AMC-INT-ME-DW-1006 Hammer and Pile Deployment Sequence
Ensure that there is a slack chain catenary of 5m hanging down from the pile padeye (assume 70m of chain payout) and a slack hammer hose catenary of at least 5m hanging down from the connection point on the hammer. Note:
· When the hammer and follower are landed on top of the pile, the additional weight will cause the pile to penetrate further into the seabed (5.2 – 18.9m)
· Pay out additional 7m of chain (approx. 70m of chain payout in total)
· Be ready to pay out on hammer hoses to keep the hoses slack at all time.
· ROV to keep monitoring chain slack and hammer – follower lowering
Keep paying out on the crane, chain and the hammer hoses in increments of 3m until the crane load monitor reads zero load or the weight of the rigging only implying the self-penetration has completed. Alternatively, ROV to monitor the orientation of the lift shackle on the hammer. If it is upright, it implies it is still holding the weight of the hammer and if it is lying at an angle, implies that the self-penetration has completed. Note: The self-penetration of the pile+hammer+follower is expected to be between 5.2 – 18.9m Reference: · 11011-AMC-INT-ME-DW-1006 Hammer and Pile Deployment Sequence
Once the pile penetration stops, payout additional 5m on the crane wire and on the chain and monitor pile for 2 minutes to ensure the completion of self-penetration. Chain payout 75m in total
ROV to read the pile marking on the seabed to estimate pile self-penetration. Alternatively, if the visibility on the seabed is poor, ROV to read the pile marking coinciding with the sleeve on the PGF to estimate self-penetration of the pile.
Record the self-penetration of the pile on the relevant record sheets

Pile Driving

Ensure that the crane wire has slack on it and the hammer hoses and chain catenary shall be maintained sufficiently slack throughout pile driving. All payouts to be synchronized with the pile penetration which shall be monitored by ROV.
Commence pile driving with 5% hammer efficiency and hammer the pile in the manner of “ hammering and stop” sequence. ROV will up and down to checks hammer + pile follower arrangement and anchor pile penetration. Gradually increase it to up to 20% until the pile is driven to 21m depth. After the pile is driven to 21m depth, continue with 20% efficiency until the pile is driven to target depth. Note: Limiting seastate for pile driving is H_S=1.5m.
ROV to monitor the following at all times during the piling operations:
· The top of the PGF to estimate the pile penetration.
· The hammer hoses, lift rigging and chain catenary to ensure that there is sufficient slack in the lines and that they remain clear of the hammer and guide frame. Note: ROV should maintain a suitable clearance from the pile hammer when it is operating. Reference:
P10046-A001-02 Pile Guide Frame GA
11011-AMC-INT-ME-DW-1006 Hammer and Pile Deployment Sequence
When the pile padeye is ~1m above the PGF funnel, ROV to check that the chain catenary is hanging towards the opening on the pile guide frame sleeve. Note: Adjust the chain catenary as required by paying out or hauling in on the chain windlass
Piling Hammer Technician(s) to record a running log of all pile driving operations throughout the piling process. As a minimum, the following shall be recorded via the pile hammer control data logger:
· Project Name and Date
· Pile Identification
· Mooring Leg Identification
· Running Time
· Blow Energy
· Blow Count
· Pile Penetration
· Events or anomalies
Stop the pile driving operations, if the 50MT winch wire reaches close to the barge B1 stern. Secure the chain, take another bite with the active and passive winches, disconnect the lock off rigging and then resume pile driving operations.
When the mooring padeye is approximately 0.5m above the seabed, ensure that the mooring chain is in a suitable configuration to continue driving pile to final depth.
Note: If required, stop the pile driving operations to adjust the chain catenary as required.
Continue driving until the target penetration depth is reached. Notes: ROV to confirm that the target penetration has been achieved by viewing the pile/follower interface at the seabed. Alternatively, it can also be confirmed if the ROV views the depth marking on the follower coinciding with the top of the PGF.
Complete the pile driving log. Record the final pile penetration and complete the relevant piling datasheets and obtain client approval. Note: Project Engineer and Client Representative to witness the pile at the target penetration.

Recovery of Hammer

Gradually increase the tension on the crane wire to pull the follower out of the pile. Note: The pile follower may be full of mud due to the presence of soil plug. Estimation ~3.5MT soil plug to be used in calculation
Come up on the crane until the follower is clear of the PGF
Haul in the crane and slew as required to bring the hammer follower assembly to the stern side of LCR. Ensure the crane wire is sufficiently outboard of the hang off frame. Recover the hammer hoses to catch up with the haul-in speed of the crane. Note:
Approx 131MT air weight and 140.2MT submerged weight (included DAF)
Crane capacity 220MT at 22.31m radius during overboarding and 184.6MT at 40.56m radius during lowering
ROV to monitor the hammer recovery and ensure that the crane haul-in and the hammer hose recovery are synchronized and the hammer hoses are not getting entangled.
Once the follower is out of water, bring the follower outside the hang off frame (in front of side opening of hang-off frame). Lower the pile follower until bottom of pile follower trunnion almost in the same height of top of pile follower saddle. Bring in pile follower from side opening of hang-off frame and align the follower trunnions with the trunnion guides on the hang off frame and land the follower on the hang off frame.
Secure the follower to the hang off frame as required to avoid tipping over (ie: using endless chain to tie down pile follower trunnion to pile hang-off frame)
Disconnect the hammer follower assembly rigging from the trunnions on the follower
Reference: 11011-AMC-INT-ME-DW-1044 Rigging Arrangement for Handling of Hammer and Pile Follower
Haul-in on the crane to slide the hammer sleeve clear off the follower.
Note: Ensure the hammer hoses are slack
Slew the hammer towards the hammer upending frame and laydown the hammer on the support frame.
Disconnect the crane stinger from the hammer lift grommet.

In case of pile follower can’t be recover, contingency plan to recover pile follower take in place.

ROV to cut connection rigging arrangement between Hammer and Pile Follower. Reference: 11011-AMC-INT-ME-DW-1044 Rigging Arrangement for Handling of Hammer and Pile Follower
Recover hammer based on step 10-18
Connect pile follower recovery rigging to crane stinger. Reference:
11011-AMC-INT-ME-DW-1031 Deployment Stinger Arrangement for Huisman Main Block.
11011-AMC-INT-ME-DW-1013 Pile Follower Upending Rigging and Lift Rigging Arrangement
With ROV guidance, lower down pile follower recovery rigging
Connect pile follower recovery rigging to Masterlink on pile follower trunnion
Reference:
11011-AMC-INT-ME-DW-1031 Deployment Stinger Arrangement for Huisman Main Block
11011-AMC-INT-ME-DW-1013 Pile Follower Upending Rigging and Lift Rigging Arrangement
Recover pile hammer based on step 10-14

Mooring Chain Installation

General

This section covers the Lay down of mooring chain operations. Mooring chain will be pre-connected (during Load out) to the anchor pile via special anchor shackles. Following pile driving activities, mooring chain section will be installed and abandoned to seabed. After completion of pile driving of each leg, each mooring chain end will recovered to tensioning tug deck and pre-tensioned.

The chain has to be installed using the 40T chain windlass, 35T winch and 15T winch on B1. At any given point, 40Tchain windlass will take the catenary tension.

Chain Details

Parameter	Mooring Chain
Number of Lines	9
Grade / Type	R3 / Studless
Diameter x Length	Ø114mm x 650m
Unit Weight (Air / Submerged)	262.5 kg/m / 228.2kg/m
Minimum Breaking Load	11287KN

Note: The free tail of the mooring chain = 30m of 144mm R3 chain

Shackle Details

The mooring chains are pre-connected to the piles via offshore special shackles. Important details of the shackles are summarised in the table below.

Parameter	Offshore Special Shackle
Number of Shackles	9
Grade / Type	R3S / D-Type, Round Pin, LTM
Unit Weight (Air / Submerged)	437.1 kg/ 380.3kg
Proof Load	8159 KN

Chain Lay Information

Chain Section			Layback (m)			Max. Static Tension (MT)			Max. Dynamic Tension (MT)
Mooring Chain			15 (Min) 25 (Nominal) 70 (Max)			22			24
	Chain Normal Lay – Static Analysis Result									Water Depth @ 55m
	Step	Vessel Move (1)		Gypsy Overboarding Location Offset From Pile Target Centre (2)	Chain Payout (3)		Total Chain Length Paid Out (4)	Chain Departure Angle (5)		Layback (6)	Top Tension at Gypsy (7)	TDP Tension (8)
		(m)		(m)	(m)		(m)	degrees		(m)	(Te)	(Te)
	Pile Lowering Last Step	–		40	–		90	8		25	17	3
	1	5		45	0		90	13		35	19	5
	2	0		45	5		95	8		25	17	3
	3	5		50	0		95	13		35	19	5
	4	0		50	5		100	8		25	17	3
	5	10		60	0		100	19		48	22	7
	6	0		60	10		110	8		25	17	3
	7	10		70	0		110	19		48	22	7
	8	0		70	10		120	8		25	17	3
	9	10		80	0		120	19		48	22	7
	10	0		80	10		130	8		25	17	3
	11	10		90	0		130	19		48	22	7
	12	0		90	10		140	8		25	17	3
	13	10		100	0		140	19		48	22	7
	14	0		100	10		150	8		25	17	3
	15	10		110	0		150	19		48	22	7
	16	0		110	10		160	8		25	17	3
	Repeat vessel step 10 m fwd	10		~	0		~	19		48	22	7
	Repeat chain payout 10m	0		~	10		~	8		25	17	3
	113	10		600	0		640	19		48	22	7
	114	0		600	10		650	8		25	17	3

At any given point during chain lay, the layback shall not be exceeding 85m since it will given the tension on the chain windlass ~40T

Chain Abandonment Information

For the 32mm chain abandonment, with a maximum layback of 48m, static analysis showed maximum top tension at the gypsy to be 22 Te with a touch down point tension of 7 Te

Chain Abandonment (32mm Chain) – Static Analysis Result					Water Depth @ 55m
Step	Vessel Move (1)	Surface Rigging Payout (2)	Total Surface Rigging Length Paid Out (3)	Surface Rigging Departure Angle (4)	Layback (5)	Top Tension at Gypsy (6)	TDP Tension (7)
Step	(m)	(m)	(m)	degrees	(m)	(Te)	(Te)
Chain Normal Lay Last Step	–	–	–	–	25	17	3
1	10	0	0	N/A	48	22	7
2	0	15	15	7	18	13	2
3	10	0	15	18	39	16	5
4	0	15	30	5	11	9	1
5	10	0	30	12	24	10	2
6	0	15	45	1	2	4	0
7	10	0	45	9	15	5	1
8	0	15	60	24	5	4	2
9	30	0	60	28	41	5	2
10	0	10	70	8	25	1	0.2

For the 24mm wire abandonment, with a maximum layback of 75m, static analysis showed maximum top tension at the gypsy to be 12 Te with a touch down point tension of 8 Te

Chain Abandonment (24mm Wire) – Static Analysis Result					Water Depth @ 55m
Step	Vessel Move (1)	Surface Rigging Payout (2)	Total Surface Rigging Length Paid Out (3)	Surface Rigging Departure Angle (4)	Layback (5)	Top Tension at Gypsy (6)	TDP Tension (7)
Step	(m)	(m)	(m)	degrees	(m)	(Te)	(Te)
32mm Chain Abandonment Last Step	–	–	70	8	25	1	0.2
1	20	0	70	45	75	12	8
2	0	15	85	13	36	1	0.3
3	10	0	85	27	59	2	1.0
4		15	90	8	26	1	0.2
5	10		90	19	49	2	0.5
6		15	105	5	17	1	0.1
7	10		105	13	36	1	0.3
8		15	130	2	9	1	0.04
9	15		130	13	36	1	0.3
10		10	140	5	17	1	0.1

For the 24mm polyprop rope abandonment, with a maximum layback of 65m, static analysis showed maximum top tension at the gypsy to be 2 Te with a touch down point tension of 1 Te

Chain Abandonment (Polyprop Rope) – Static Analysis Result					Water Depth @ 55m
Step	Vessel Move (1)	Surface Rigging Payout (2)	Total Surface Rigging Length Paid Out (3)	Surface Rigging Departure Angle (4)	Layback (5)	Top Tension at Gypsy (6)	TDP Tension (7)
Step	(m)	(m)	(m)	degrees	(m)	(Te)	(Te)
24mm Wire Abandonment Last Step	–	–	140	5	17	1	0.1
1	20	0	140	26	65	2	0.9
2	0	15	155	11	25	1	0.2
3	10	0	155	22	49	1	1.0
4		15	170	8	16	1	0.1
5	10		170	19	35	1	0.3
6		15	185	6	8	0.2	0.02
7	20		185	30	44	1	0.3
8		15	200	54	18	0.01	0.01
9	10		200	41	30	0.06	0.04
10		10	210	59	28	0.01	0.01

Operational Parameters

The heading of B1 is to be maintained with the chain windlass along the mooring leg lay route and the bow towards the mooring centre throughout the mooring chain lay operation. The heading of LCR and T1 will be monitored by survey screen on their respective bridge.

Allowable chain twist during installation is 5⁰ per link. Chain twist can be monitored visually by paint marking on every other link. The allowable mooring chain lay corridor is 30m i.e +/-15m on either side of the design route.

Chain Laying and Chain Abandonement by Cargo Barge Using Subsea and Surface Pickup Rigging

Status

· HIRA has been reviewed and the mitigation actions been put in place as per document no: 11011-AMC-HESS-RM-RA-1301 Project Hazard Identification and Risk Analysis (HIRA)
· Toolbox talk has been conducted with all personnel to be involved in the operation.
· Offshore weather forecast has been reviewed and actual weather condition is still inside limiting seastate to do intended operation. All parties agreed to proceed with consideration to actual weather condition. Refer to Section 1.12 Table 1 for Limiting Seastate
· B1 with the anchor piles, pile follower and mooring chains moored on the port side of LCR (Refer to drawing 11011-AMC-INT-ME-DW-1007 Chain Laying and Abandonment Sequence using Surface Pickup Rigging and 11011-AMC-INT-ME-DW-1001 Cargo Barge #1 (Anchor Piles, Mooring Chains and Pile Follower) Layout
· Pile driving to target depth is completed.
· Pile hammer and follower assembly recovered and secured.
· Piling operation completed
· Hammer and Pile Follower have been recovered and store at LCR
· The winch wire is marked at every 10m from the end (which has been done during the spooling of the wire onshore)
· Chain seafastenings ( at the end of the each chain end and inner side stanchions) must be cut prior of anchor chain laying

Payout on the chain using chain windlass. Lay the chain while simultaneously stepping ahead the vessel (LCR) along the mooring leg lay route. Follow the mooring leg lay route as per drawing no: 11011-AMC-INT-ME-DW-1009 Mooring Chain Laydown and Layout Arrangement Drawing which will be plotted in survey monitor. Note:
· Deck Foreman to monitor the chain as it is getting overboarded to ensure no twists are induced and chain tension will not to much by looking for overboarding chain angle
· ROV to continuously monitor the catenary TDP as well as chain twist (when visibility permitted)
· Adjust the catenary as required to be within the layback range specified.
· Survey to take fixes at the chain TDP on the seabed as the chain is being laid to plot the as-laid chain route.
· If ROV unable to monitor the chain TDP due to poor visibility, Survey to take fixes at the barge stern / chain windlass position as the chain is being laid to plot the as-laid chain route
· Barrge stern / chain windlass position will be plotted in survey screen using computer aided program by drawing the position of B1 compared to LCR. Note:
Approx 18T chain tension during chain laying
Limiting seastate for Mooring Chain laying is H_S=2.0m.
Once the end of the chain is almost reaches B1 stern hold back rail, secured the chain using the chain lock off rigging.
Lay down 70m x 32mm chain U3 on centre of the barge. Connect end of chain to 70m x 32mm chain. Connect end of 70m x 32mm chain to 35T winch wire
Winch take tension and disconnect lock off rigging and then resume laying of surface pickup rigging
When 7^th link of chain from end of chain is overboard /outside of chain windlass, all stop on chain windlass and winch. Lock off 32mm chain connect subsea pickup rigging as per 11011-AMC-INT-ME-DW-1016 Chain A&R and Marker Buoy Rigging Arrangement
After completed installation of subsea recovery rigging, winch take tension and disconnect lock off rigging and then resume laying of surface pickup rigging
Once the end of the 70m x 32mm chain is almost reaches B1 stern hold back rail, , secure the chain using the chain lock off rigging. Disconnect 35T winch wire
Lay down 70m x 28mm dia wire sling on centre of the barge. Connect end of 32mm chain to 70m x 28mm dia wire sling. Connect end of 70m x 28mm dia wire sling to 35T winch wire
Winch take tension and disconnect lock off rigging and then resume laying of surface pickup rigging
Once the end of the 70m x 28mm dia wire sling is almost reaches B1 stern hold back rail,, secure the wire using the wire lock off rigging (using endless chain). Disconnect 35T winch wire
Lay down 70m x 24mm dia PP rope on centre of the barge. Connect end of 70m x 28mm dia wire sling to 70m x 24mm dia PP Rope. Connect end of 70m x 24mm dia PP Rope to 35T winch wire
Winch take tension and disconnect lock off rigging and then resume laying of surface pickup rigging
Once the end of the 70m x 24mm dia PP Rope is almost reaches B1 stern hold back rail or no tension detected on PP Rope, secured PP rope on temporary stopper at B1 sterm and disconnect 35T winch wire
Take out PP rope from chain windlass and connect end of 70m x 24mm PP rope to 0.5T surface buoy.
Note: no tension will be expected on the PP rope. Buoy to be marked based on installed mooring leg number
Splashed the buoy by pushing the buoy overboard the B1
Survey take fix of buoy location using barge stern location and indicate it on survey screen

Chain Laying by Cargo Barge and Chain Abandonement by LCR using only Subsea Pick-Up Rigging

Payout on the chain using chain windlass. Lay the chain while simultaneously stepping ahead the vessel (LCR) along the mooring leg lay route. Follow the mooring leg lay route as per drawing no: 11011-AMC-INT-ME-DW-1009 Mooring Chain Laydown and Layout Arrangement Drawing which will be plotted in survey monitor. Note:
· Deck Foreman to monitor the chain as it is getting overboarded to ensure no twists are induced and chain tension will not to much by looking for overboarding chain angle
· ROV to continuously monitor the catenary TDP as well as chain twist (when visibility permitted)
· Adjust the catenary as required to be within the layback range specified.
· Survey to take fixes at the chain TDP on the seabed as the chain is being laid too plot the as-laid chain route.
· If ROV unable to monitor the chain TDP due to poor visibility, Survey to take fixes at the barge stern / chain windlass position as the chain is being laid to plot the as-laid chain route
· Barge stern / chain windlass position will be plotted in survey screen using computer aided program by drawing the position of B1 compared to LCR. Note: Approx 18T chain tension during chain laying. Reference:
11011-AMC-INT-ME-DW-1001Cargo Barge #1 (Anchor Piles, Mooring Chains and Pile Follower) Layout
11011-AMC-INT-ME-DW-1009 Mooring Chain Laydown and Layout Arrangement Drawing
11011-AMC-INT-ME-DW-1050 Chain Laying and Laydown Sequence Using Subsea Pick-up Rigging
Once the end of the chain is almost reaches B1 stern hold back rail, secured the chain using the chain lock off rigging. Reference: 11011-AMC-INT-ME-DW-1034 Chain Lock off Rigging on the barge
Install subsea recovery rigging at the end of 114mm chain Reference: 11011-AMC-INT-ME-DW-1050 Chain Laying and Laydown Sequence Using Subsea Pick-up Rigging
Connect aux block with chain deployment rigging including swivel and ROV hook. Note;Aux crane stinger shall be equipped by beacon. Record beacon ID. Reference:
11011-AMC-INT-ME-DW-1050 Chain Laying and Laydown Sequence Using Subsea Pick-up Rigging
11011-AMC-INT-ME-DW-1017 Chain Deployment and Recovery Pennant by Crane
11011-AMC-INT-ME-DW-1032 Crane Stinger Arrangement for Huisman Aux. Block
11011-AMC-INT-ME-DW-1016 Chain A&R and Marker Buoy Rigging Arrangement
Bring aux hoist with chain deployment rigging to B1 deck
Connect ROV hook to subsea recovery rigging on 1^st link of chain
35T winch take tension and release chain lock-off rigging
Pay out the remaining 114mm chain by gipsy meanwhile crane and 35T winch will follow the chain payout. Cross haul 114mm chain from B1 to LCR.
Note: Limiting seastate for Mooring Chain laying is H_S=2.0m.
After all tension being taken by 35T winch, Aux crane start take tension and slew back to transfer chain to LCR stern where chain hang-off frame located.
35T winch wire follow the chain transfer from B1 to LCR. Note: Expected Load 18MT
Haul chain until 10^th links on the chain hang-off frame. Secured it
Disconnect 35T winch wire from the 114mm chain, Retrieve back 35T winch wire to the B1
Crane take tension on the chain and haul in to release chain from hang-off frame
Lower down 114mm chain using aux block of the crane
· Zero the crane payout meter when the chain touch the waterline. Survey Team to check the location of end of chain position (based on beacon on stinger). ROV to monitor the catenary TDP and ensure that the chain is laid along the planned abandonment route (when visibility is permitted). Note : expected load 18MT
Land the chain on the seabed and slack off the aux block. ROV to disconnect the pennant hook from the subsea recovery rigging masterlink.
ROV to take a fix at the mooring chain link connected to the subsea recovery rigging.
Haul-in the aux hoist to the deck and relocate LCR to the next chain tensioning location for abandon next chain after pre-tensioning by F1. Refer to 11011-AMC-INT-ME-DW-1009 Mooring Chain Laydown and Layout Arrangement Drawing for sequence of mooring leg tensioning

Pre-Tensioning of Mooring Chain by Tensioning Tug and Lower Down of Subsea Recovery Pick up Rigging

This section covers the mooring chain pre-tensioning operation. The pre-tensioning operation will be carried out after all the mooring piles and mooring chain sections are installed. Prior to beginning the pre-tensioning operation, it is required to cast away the B1 and LCR to maximize the utility of vessel bollard pull towards tensioning operation.

Pre-Tensioning Information

Parameter	Value	Unit
Target Pre-tensioning load at anchor shackle	150	MT
Target Pre-tensioning load to be read on the load cell	225	MT
Hold Period	30	minutes
Chain Length	650	m
AHT Bollard Pull Capacity	255	T
AHT Tow/Work Wire	76	mm
Load Cell Capacity	300	T

Installation Tolerance

Anchor Leg Pretension Angle

The specification for the anchor leg pretension angle shall be +/- 1⁰measured from center of pile to center of fairlead straight line

Chain Pre-Tensioning Analysis

The AHT model was moved 47.5 metres away from the end of chain, where a tension of 151 Te was simulated at the chain second end. At this point, a static top tension of 228 Te was produced at the stern of the tug boat pretensioning the chain with a layback of 301 metres. The touch down point tension was 213 tonnes.

Chain Pretensioning – Static Analysis Result					Water Depth @ 55m
Step	Vessel Movement		Layback (3)	Tension
	Vessel Step (1)	Cumulative Distance (2)	Layback (3)	at Tug (4)		at TDP (5)	at Chain Pile End (6)
	(m)	(m)	(m)	(Te)		(Te)	(Te)
1	0	0	6	15		0.5	3
2	25	25	58	24		10	5
3	15	40	151	70		56	22
4	5	45	234	145		131	70
5	2.5	47.5	301	228		213	151
6	-2.5	45	234	145		131	70
7	-5	40	151	70		56	22
8	-15	25	58	24		10	5
9	-25	0	6	15		0.5	3

Operational Parameters

For pre-tensioning, tensioining tug Lewek Teal shark jaw/ stern roller position shall be aligned along the mooring leg lay route with F1 bow towards the mooring centre.

The heading of Lewek Teal will be monitored by survey screen on her bridge

Allowable chain twist during installation is 5⁰ per link. Chain twist can be monitored visually by paint marking on every other link.

Recovery of Chain by AHT, Pre-Tensioning by AHT and Chain Abandonment by LCR

Status

Pre-rigged chain tensioning arrangement. Reference:
11011-AMC-INT-ME-DW-1008 Chain Recovery and Pre-Tension
11011-AMC-INT-ME-DW-1022 Crane Pre-Tensioning Rigging Arrangement
Prepare load cell and ensure in good working condition including the spare battery. Calibration certificate to be shown to CAR and third party
Based on survey system which indicates the location of each pick up buoy, Teal to approach surface pick up rigging. Note: the tensioning sequence shall take consider the surface buoy location and the next location of lowering down of mooring chain after pre-tensioning.
Reference: 11011-AMC-INT-ME-DW-1008 Chain Recovery and Pre-Tension
Teal recover surface buoy (NO TENSION) and heave up work wire until surface buoy on deck; secured surface pick up rigging by karmfork / shark jaw
Reference: 11011-AMC-INT-ME-DW-1016 Chain Laydown and Recovery with Subsea Pick Up Rigging Arrangement
Disconnect surface buoy from surface pick up rigging.
Connect surface pick up rigging with work wire
Take tension on work/tow wire and lower down karmfork/shark jaw
Start recover surface pick up rigging and spool to work drum. Vessel Master monitors Teal position and tension on work drum
Continue recover surface pick up rigging until chain on deck. Note: if work drum can’t spool all surface pick up rigging, stop the recover operation, and transfer the parts of surface pick up rigging before continue recover surface pick up rigging. Total length of surface pickup rigging = 210m
Secure chain on deck by karmfork/sharkjaw and disconnect surface pick up rigging
Connect chain tensioning arrangement to end of chain. Note: Subsea recovery pick up rigging still connected to 1^st link chain from end. removed subsea recovery rigging and reconnected to the 1^st link of chain after pre-tensioning completed
Connect other end of chain tensioning arrangement to work wire
Teal starts positioning herself for chain-pretensioning. Teal work wire shall be aligned with mooring leg lay route meanwhile Teal bow towards the mooring centre. Note: No personnel allowed to be near to “live” wire during tensioning due to high load. Limiting seastate for Mooring Chain pretensioning is H_S=1.0m.
Teal starts pre-tensioning the mooring chain, gradually increase vessel thrust until the required pre-tension value is achieved.VM keeps monitoring Teal position during pre-tensioning. Note: 228T on load cell reading to get 150T on anchor shackle.
Hold the intended tension value for 15 minutes. Note: Record the load cell reading, winch loadcell and vessel heading and the vessel stern position at an interval of 1 minute throughout the hold period. Company representative and third party rep (MWS and class) to witness the pre-tensioning. The reading of load cell and winch load cell will be compared with each other, if the result gives no significant difference (+/- 5%) with each other, winch load cell will be used as a tools to record the tension result.
After the acceptance of the pre-tensioning, gradually reduce the vessel thrust and step Teal astern to slack off the chain catenary.
Secured chain on karmfork/sharkjaw and disconnect chain tensioning arrangement and work wire
Teal follows the chain abandonment layout (in dog leg fashion) based on survey monitor. Teal captain monitors the tug movement to avoid chain twist
Connect subsea pickup rigging to end of chain. Reference: 11011-AMC-INT-ME-DW-1016 Chain Laydown and Recovery with Subsea Pick Up Rigging Arrangement
After Teal reaches intended position for transfer of chain, LCR approach and alongside Teal. 11011-AMC-INT-ME-DW-1009 Mooring Chain Laydown and Layout Arrangement Drawing.
Connect aux block with chain deployment rigging including ROV hook. Reference:
11011-AMC-INT-ME-DW-1030 Chain Laying and Abandonment Sequence using subsea pick-up rigging
11011-AMC-INT-ME-DW-1017 Chain Deployment and Recovery Rigging by Crane
11011-AMC-INT-ME-DW-1032 Crane Stinger Arrangement for Huisman Aux. Block
11011-AMC-INT-ME-DW-1016 Chain Laydown and Recovery with Subsea Pick Up Rigging Arrangement
Bring aux hoist with chain deployment rigging to AHT deck
Connect ROV hook to subsea recovery rigging on 1^st link of chain
Haul in main crane to take out any slack in the rigging and take tension on the chain
Work Wire also take tension as chain hold back on 7^th link of chain
Lower down karmfork/shark jaw and start cross haul the chain from Teal to LCR
Crane continue to slew back to chain hang-off plate position at midstern of LCR, Teal work wire continue follow crane direction
Secured chain on chain hang-off plate and disconnect Teal work wire from chain
Heave in Teal work wire and after F1 work wire on deck, F1 cast off from location and approach other surface buoy location. Refer to 11011-AMC-INT-ME-DW-1009 Mooring Chain Laydown and Layout Arrangement Drawing for sequence of mooring leg tensioning
Haul in main crane to take out any slack in the chain deployment rigging and take tension on the chain
Lower down the chain include the aux block of the crane. ROV to monitor the catenary TDP and ensure that the chain is laid along the planned abandonment route (when visibility is permitted)
Land the chain on the seabed and slack off the aux block. ROV to disconnect the pennant hook from the subsea recovery rigging masterlink.
ROV to take a fix at the mooring chain link connected to the subsea recovery rigging.
Haul-in the aux hoist to the deck and relocate LCR to the next chain tensioning location for abandon next chain after pre-tensioning by Teal. Refer to 11011-AMC-INT-ME-DW-1009 Mooring Chain Laydown and Layout Arrangement Drawing for sequence of mooring leg tensioning

Recovery of Chain by LCR, Pre-Tensioning by AHT and Chain Abandonment by LCR

LCR is positioned over the end of the mooring chain. Vessel heading will be selected based on Site conditions and position of the FPSO during the chain recovery. Reference: 11011-AMC-INT-ME-DW-1051 Chain Recovery and Tensioning Sequence Using Subsea Pick-up Rigging.
ROV is launched to locate exact location of the recovery sling, Reference:
11011-AMC-INT-ME-DW-1016 Chain Laydown and Recovery with Subsea Pick Up Rigging Arrangement
11011-AMC-INT-ME-DW-1009 Mooring Chain Laydown and Layout Arrangement Drawing
ROV hook assembly is connected to the aux hook line, Reference:
11011-AMC-INT-ME-DW-1016 Chain Laydown and Recovery with Subsea Pick Up Rigging Arrangement
11011-AMC-INT-ME-DW-1017 Chain Deployment and Recovery Rigging Arrangement
11011-AMC-INT-ME-DW-1051 Chain Recovery and Tensioning Sequence Using Subsea Pick-up Rigging
ROV hook assembly is lowered into water and to within 5 meters of seabed, Reference: 11011-AMC-INT-ME-DW-1051 Chain Recovery and Tensioning Sequence Using Subsea Pick-up Rigging
ROV directs ROV hook assembly over end of mooring chain, Reference: 11011-AMC-INT-ME-DW-1051 Chain Recovery and Tensioning Sequence Using Subsea Pick-up Rigging
Using ROV, connect ROV hook to abandonment rigging master link. Reference:
11011-AMC-INT-ME-DW-1051 Chain Recovery and Tensioning Sequence Using Subsea Pick-up Rigging
11011-AMC-INT-ME-DW-1016 Chain Laydown and Recovery with Subsea Pick Up Rigging Arrangement
11011-AMC-INT-ME-DW-1017 Chain Deployment and Recovery Rigging Arrangement
ROV moves away from connection and inspects the chain as it is lifted by the crane. Note: The swivel has been added to attempt to eliminate any twists that may have formed in the chain during the installation. Reference: 11011-AMC-INT-ME-DW-1051 Chain Recovery and Tensioning Sequence Using Subsea Pick-up Rigging
Crane recovers chain to surface while the vessel moves along the layback path as per Ref. Reference
11011-AMC-INT-ME-DW-1009 Mooring Chain Laydown and Layout Arrangement Drawing
11011-AMC-INT-ME-DW-1051 Chain Recovery and Tensioning Sequence Using Subsea Pick-up Rigging
11011-AMC-HESS-ME-RA-3111 Mooring Installation and Hook-Up Analysis Report
Note: Vessel is moved as close as possible while avoiding any hazardous areas (ie. Subsea asset)
Haul chain over chain hang-off frame and slot in 10^th chain link onto chain hang-off frame as per 11011-AMC-INT-ME-DW-1051. After chain secured on chain hang-off plate, lock the chain hang-off plate to add chain securing point, per Ref. 11011-AMC-INT-ME-DW-1051 Chain Recovery and Tensioning Sequence with Subsea Pickup Rigging 11011-AMC-INT-ME-DW-2003 Chain Handling on Lewek Crusader Deck
Note: ensure no side loading of ROV hook, swivel, etc during recovery to deck. Analysis shows tension In crane to be 18 tonnes during recovery (11011-AMC-HESS-ME-RA-3111 Mooring Installation and Hook-Up Analysis Report )
Teal alongside to LCR and secured it
Aux crane stinger connected to the subsea pick-up rigging. Crane take tension on the chain and haul in to release chain from hang-off frame. Note: Expected load 18MT
Slew crane to the AHT deck
Land 114mm chain on AHT deck and secured it on the Sharkjaw. Disconnect subsea pick-up rigging
Pre-rigged chain tensioning arrangement. Reference:
11011-AMC-INT-ME-DW-1008 Chain Recovery and Pre-Tensioning.
11011-AMC-INT-ME-DW-1022 Crane Pre-Tensioning Rigging Arrangement (with load cell)
Prepare load cell and ensure in good working condition including the spare battery. Calibration certificate to be shown to CAR and third party
Connect chain tensioning arrangement to end of chain. Note: Subsea recovery pick up rigging still connected to 1^st link chain from end. removed subsea recovery rigging and reconnected o the 1^st link of chain after pre-tensioning completed
Connect other end of chain tensioning arrangement to work wire
Teal starts positioning herself for chain-pretensioning. Teal work wire shall be aligned with mooring leg lay route meanwhile Teal bow towards the mooring centre. Note: No personnel allowed to be near to “live” wire during tensioning due to high load. Limiting seastate for Mooring Chain pretensioning is H_S=1.0m.
Teal starts pre-tensioning the mooring chain, gradually increase vessel thrust until the required pre-tension value is achieved. VM keeps monitoring Teal position during pre-tensioning. Note: 228T on load cell reading to get 150T on anchor shackle.
Hold the intended tension value for 15 minutes. Note: Record the load cell reading, winch loadcell and vessel heading and the vessel stern position at an interval of 1 minute throughout the hold period. Company representative and third party rep (MWS and class) to witness the pre-tensioning. The reading of load cell and winch load cell will be compared with each other, if the result gives no significant difference (+/- 5%) with each other, winch load cell will be used as a tools to record the tension result.
After the acceptance of the pre-tensioning, gradually reduce the vessel thrust and step Teal astern to slack off the chain catenary.
Secured chain on karmfork/sharkjaw and disconnect chain tensioning arrangement and work wire
Teal follows the chain abandonment layout (in dog leg fashion) based on survey monitor. Teal captain monitors the tug movement to avoid chain twist.
Connect subsea pickup rigging to end of chain. Reference: 11011-AMC-INT-ME-DW-1016 Chain Laydown and Recovery with Subsea Pick Up Rigging Arrangement.
After Teal reaches intended position for transfer of chain, LCR approach and alongside Teal 11011-AMC-INT-ME-DW-1009 Mooring Chain Laydown and Layout Arrangement Drawing
Connect aux block with chain deployment rigging including ROV hook. Reference:
11011-AMC-INT-ME-DW-1030 Chain Laying and Abandonment Sequence using subsea pick-up rigging
11011-AMC-INT-ME-DW-1017 Chain Deployment and Recovery Rigging
11011-AMC-INT-ME-DW-1032 Crane Stinger Arrangement for Huisman Aux. Block
11011-AMC-INT-ME-DW-1016 Chain Laydown and Recovery with Subsea Pick Up Rigging Arrangement
Bring aux hoist with chain deployment rigging to AHT deck
Connect ROV hook to subsea recovery rigging on 1^st link of chain
Haul in main crane to take out any slack in the rigging and take tension on the chain
Work Wire also take tension as chain hold back on 7^th link of chain
Lower down karmfork/shark jaw and start cross haul the chain from Teal to LCR
Crane continue to slew back to chain hang-off plate position at midstern of LCR, Teal work wire continue follow crane direction
Secured chain on chain hang-off plate and disconnect Teal work wire from chain
Heave in Teal work wire and after F1 work wire on deck, FI cast off from location and approach other surface buoy location. Refer to 11011-AMC-INT-ME-DW-1009 Mooring Chain Laydown and Layout Arrangement Drawing for sequence of mooring leg tensioning
Haul in main crane to take out any slack in the chain deployment rigging and take tension on the chain
Lower down the chain include the aux block of the crane. ROV to monitor the catenary TDP and ensure that the chain is laid along the planned abandonment route (when visibility is permitted).
Land the chain on the seabed and slack off the aux block. ROV to disconnect the pennant hook from the subsea recovery rigging masterlink.
ROV to take a fix at the mooring chain link connected to the subsea recovery rigging.
Haul-in the aux hoist to the deck and relocate LCR to the next chain tensioning location for abandon next chain after pre-tensioning by Teal. Refer to 11011-AMC-INT-ME-DW-1009 Mooring Chain Laydown and Layout Arrangement Drawing for sequence of mooring leg tensioning

FPSO HOOK-UP AND TENSIONING

The scope of work for mooring system hook-up and tensioning in sequence of installation activities are listed below:

Completed installation of mooring system (pile installation, chain laying and mooring system pre-tensioning.
Arrival of FPSO on site and transfer hook-up team, including client and third party rep., to FPSO.
Hook-up positioning tugs to FPSO and establish positioning control (2 Tugs at FPSO bow and 1 Tug at FPSO stern)
LCR recover the mooring chain from seabed with assistance of the ROV helps to pick-up subsea pick-up rigging arrangement
Transfer FPSO pull in winch wire and LLLC from FPSO to LCR
Connection of FPSO pull in wire and LLLC to chain end link
Cross haul mooring chain from LCR to FPSO and initial pull in of mooring chain
Secure chain on chain stopper (2nd link)
Recover and pull in remaining chain leg to FPSO chain stoppers
Disconnection of bow tugs
Tensioning of chains to target tension
Cutting of excess chains as instructed by LMC representative onboard, recovery of cut sections and stockpiling on FPSO designated area for chain storage
Perform as-built survey of chain catenaries

FPSO CHAIN HOOK-UP AND TENSIONING EQUIPMENT S AND MATERIALS

FPSO Chain Hook-Up and Tensioning Equipments

The following are the particulars of FPSO hook-up and tensioning equipment on board LCR and FPSO

Equipment

Particulars

Quantity

Chain hang-off frame

Type frame

Capacity

Chain hang-off

: 30 MT (SWL)

1 x unit

ROV Spread (24 hrs operation)

Type

: Subsea Vehicles

1 x LARS



	Make : EMAS XLS Dim :1.80mx3.23mx2.13m Capacity : 150 HP Work Class	1 x Control Container 1 x Workshop Container
Survey Equipment (24 hrs operation)
Lewek Crusader	C-Nav DGNSS c/w C-Nav Global Correction Signal (Primary and Secondary)	2
	Survey Gyrocompass (Primary)	1
	GNSS Heading Sensor (Secondary)	1
	EIVA Navigation & Barge Management System	1+1
	Remote EIVA Navigation Computer (ROV, Dive Control)	2+1
	Remote LCD Monitors (Capt/DPO and 1 spare)	2+1
	Radio Telemetry System Fq1 and Spare	1+1
	UPS (Gyro+BMS+GNSS)	2
	Admin PC	1
	Mini-Beacons and Chargers (ROV x2, TMS x 1, Crane, Diver1, Diver2, 1 Spare)	7+1
	Total Station c/w Accessories	1
	Midas SVX2 SVP/CTD Profiler	1+1
	EIVA Tug Management System on Frequency Fq2	1
	Radio Data Telemetry System: and Spare	1+1
FPSO Perisai Kamelia	C-Nav DGNSS c/w C-Nav Global Correction Signal: Bridge (Primary & Secondary) and Turret	2+1
	EIVA Barge Management System: Bridge Fq2 and Spare	1+1
	EIVA Tug Management	1+1

System: Turret Fq1

Radio Data Telemetry

System: Bridge Fq2, Turret Fq1

2+1

Meridian Gyrocompass (Primary & Secondary)

LCD Monitors: FPSO Hook-up

Supervisor, 1 Spare

1+1

UPS: GNSS, Radio, BMS,

Gyro, 1 Spare

AHT X 3

C-Nav DGNSS c/w C-Nav

Global Correction Signal (Spare on LCR)

EIVA Tug Management

System Fq1 (Spare on LCR)

Radio Data Telemetry System Fq1 (Spare on LCR)

Hemisphere GPS Heading

Sensor (Spare on LCR)

LCD Monitors: Bridge (Spare on LCR)

UPS: GNSS, TMS, GPS-

HDG, Radio, 1 Spare (Spare on LCR)

FPSO Chain Hook-Up Materials and Installation Aids

This section details the project materials and installation aids required for FPSO chain hook-up and tensioning. The following table details the list of the materials and installation aids:

Particulars

Permanent Material:

9 off connecting shackle between anchor pile and anchor chain

Contractor

9 off Ø114mm studless mooring chains, 650m long each

Contractor

Installation Aids

3 x LLLC Connector

Contractor

Chain Recovery Rigging (pre-installed onto chains)

Sub-Contractor

FPSO Pull-In Arrangement including 120T MT winch, chain wheel etc

Contractor

LCR crane

Sub-Contractor

Chain sacrificial sling (for cross hauling, to be cut by ROV)

Sub-Contractor

Chain hang-off plate and riser working platform

Sub-Contractor

Scaffolding

Contractor/ Sub-Contractor

FPSO Pull-in Winch

Contractor

PRODUCT DATA AND INSTALLATION PARAMETER

Mooring Chains

Parameter	Ground Chain
Number of Lines	9
Grade / Type	R3 / Studless
Diameter x Length	Ø114mm x 650m
Unit Weight (Air)	262.5 kg/m
Unit Weight (Submerged)	228.2kg/m
Minimum Breaking Load	11287 kN

Note: The free tail of the mooring chain = 30m of 144mm R3 chain

LLLC Details

The mooring chains will be connected to FPSO pull in winch rire with LLLC connector Important details of the LLLC are summarised in the table below.

Parameter	LLLC Connector
Number of Shackles	3
Grade	R3S
Unit Weight (Air / Submerged)	128 kg / 111.4 kg
Proof Load	3136 kN

FPSO Pull-In Winch Details

The FPSO shall be outfitted with a 120 MT pull-in winch complete with sufficient wire rope. The pull-in winch shall be used to recover the mooring chains into the FPSO chain stoppers and for the final anchor leg tensioning. Refer Appendix D for pull-in winch

Parameter	120T FPSO pull-in winch
Capacity	120T all layers
Speed	3m/min
Wire specification (type, length etc)	Flexpack fully non rotating 35xk7, lay direction RHOL Rope Grade 1960N/mm2 62mm – tolerance +2%/+4% No load 327m (including 5 dead turns) 3540kN.
Socket type	Rope-Block Short Bow Socket 526

FPSO Summary Details

The general particulars of the FPSO are listed below:
Length Between Perpendiculars (LBP)	=	263.690 m
Length Overall (LOA)	=	250.300 m
Breadth (Moulded)	=	40.792 m
Depth (Moulded)	=	22.200 m
Tow Draft (mean)	=	8.30 m
Deadweight	=	95,102.5T

FPSO Trim Angle = Baseline draft 8.408 @250.85f, 8.19 @0.00

Trim: Forward 0.22 / 250.85 Heel: Starboard 0.46 deg

Refer to P956-00-DWG-G-00008 for FPSO Perisai Kamelia general arrangement drawing /20./. The installation location for the FPSO turret centerline is below.

Easting 302 315.26 m

Northing 774 986.25 m

Anchor leg horizontal tension angle (with respect to turret): 45 degrees at 8.32m (ballast) draft, Refer to Mooring Analsysis

Note: the above figures represent mean position of the FPSO without any environmental forces acting on the FPSO. Final acceptance of the FPSO installation location will be at the discretion of Company representative and mooring system design engineering company representative.

Cross Haul information

Chain Section	Max. Static Tension (MT)	Max. Dynamic Tension (MT)
Mooring Chain	17	20

Station Keeping Capabilities

It is imperative that the FPSO can be held on station and not permitted to yaw, sway or surge uncontrollably during final positioning whilst the FPSO is near the LCR and other marine vessels during hook-up of the mooring chains. Therefore, to gain an understanding of the control of the FPSO, station keeping familiarization will be undertaken as the FPSO moves from the end tow location approximately one (1) nautical mile South West of the turret center.

FPSO Installation Tolerances

The FPSO shall be installed relative to the position of the turret design center with the following tolerances

FPSO Hook-Up

Parameter	Value
FPSO Turret Position	+/- 3m
Orientation or Heading during Pull-in	+/- 5 O
Anchor Leg Pretension Angle	+/- 1 O
Chain Twist	5° Per link
Mooring Chain Final Tension	5 %

The control of the final position of the turret will be confirmed on the basis of link counting and chain angle measurement. Chain links shall be painted before chain links come to offshore. The mooring system design engineer will give instruction for which links shall be stop and cut for every leg and every round of tensioning. The target link will also be verified by rigging crew onboard the FPSO during chain pull-in. After final target link is engaged in the chain stopper, chain angle measurement using digital inclinometer onto the chain stopper shall be performed. Final acceptance of the chain tensioning shall be performed in conjunction with Company representative and mooring system design engineering company representative.

Weather Limiting Criteria

The limiting weather criteria described below is defined primarily by the ability of the positioning tugs to maintain the FPSO position and heading during the chain hook-up operations. The limiting criteria are based on beam sea conditions which are considered the worst possible loading conditions on the FPSO.

Significant Wave Height (Hs) = 1.5 m

While the above stated criteria can be used as a guide, limiting weather criteria shall be at the discretion of the Tow Masters, FPSO Master and OCM

FPSO Positioning Bridle Pre-Rigging and Hook-Up

Towing bridle will be used as positioning bridle for this project. Towing and positioning bridles for the FPSO shall be sent to Keppel Yard Singapore and pre-rigged onto the FPSO before departure of the FPSO to field. Refer Appendix C, 11011-AMC-INT-ME-DW-2001 FPSO Tow, Positioning and Heading Control Tug Arrangement for towing and positioning bridle pre-rigging drawings.

Upon completion of FPSO towage to site and during tensioning of mooring system by Tensioning Tug (F1), FPSO is steaming at holding area with the 2 tugs (F2 and T2) connected to FPSO port bow and FPSO stbd bow. F1 as tensioning tug after completion of her work will approach FPSO stern for later to be connected with emergency towing arrangement. Refer Appendix C, 11011- AMC-INT-ME-DW-2001 FPSO Tow, Positioning and Heading Control Tug Arrangement.

Heaving line will be used to transfer positioning bridle from FPSO to F1 for FPSO bow and stern side positioning bridle.

Hook-up Sequence

The following sequence shall be considered as the base case for hook-up sequence however the sequence is dependent on the onsite weather conditions and shall remain at the discretion of the Tow Master in conjunction with FPSO Master and OCM.

Maintain FPSO heading of 247.5 degrees, hook up chain leg #2
Rotate FPSO to heading of 7.5 degrees, hook up chain leg #5
Rotate FPSO to heading of 127.5 degrees, hook up chain leg #8
Rotate FPSO to heading of 132.5 degrees, hook up chain leg #9
Rotate FPSO to heading of 252.5 degrees, hook up chain leg #3
Rotate FPSO to heading of 12.5 degrees, hook up chain leg #6
Rotate FPSO to heading of 2.5 degrees, hook up chain leg #4
Rotate FPSO to heading of 242.5 degrees, hook up chain leg #1
Rotate FPSO to heading of 122.5 degrees, hook up chain leg #7

Refer Appendix B, 11011-AMC-INT-ME-DW-2005 Chain Pull-in Sequence and Appendix B, 11011- AMC-INT-ME-DW-2007 Field Layout and Mooring Leg Hook-Up Sequence for Chain Pull-In Sequence.

Vessel Location and Position

All positioning operations of the FPSO shall be monitored by means of:

FPSO control (survey room) from FPSO Tow Master/Surveyor.
General observation by LCR and FPSO team member
LCR heading monitored by bridge crew.
Positioning tugs heading monitored by FPSO Tow Master and Tug Masters.

The desired heading for the FPSO during the initial leg of chain hookup is 247.5 degrees based on prevailing weather conditions forecast for the hook-up period.

Prior to operations commencing, the FPSO Tow Master, LCR Master, FPSO Master, AHTs master, OCM, Client Rep and CAR shall assess the local environmental conditions, which shall include but not be limited to the following factors:

Weather forecast (to establish / confirm weather window)
Tidal stream and velocity
Ground swell direction
Wave height and direction
Wind direction and velocity

During all activities within the FPSO swing circle, the LCR bridge shall display the FPSO and its swing circle, the stern AHT, ROV and installation vessel positions. It shall also display the FPSO anchor chain positions, FPSO anchor chain subsea buoy positions, PLEM, pipeline and WHP

FPSO Preparation Works

Before commencing the chain pull-in operations, the following preparatory works shall be completed by the FPSO team.

Onshore

Status

· HIRA has been reviewed and the mitigation actions been put in place, as per Ref. 11011-AMC-HESS-RM-RA-1301 Project Hazard Identification & Risk Analysis (HIRA
· Toolbox talk has been conducted with all personnel to be involved in the operation.

Mobilize FPSO hook-up rigging team and equipments required onboard FPSO.
Test and verify installed survey system in FPSO and AHTs during mobilization at Keppel shipyard, as per Ref. 11011-XXX-HESS-MO-KA-4211 Survey and Positioning Procedure – FPSO & Mooring System Installation
Check all supporting facilities onboard FPSO (lighting, electricity, water, crane, tugger, winch, laydown area etc) prior to sailout from Keppel shipyard, as per Ref. P956-00-DWG-G-00008 FPSO Perisai Kamelia General Arrangement
Familiarize FPSO rigging crew with turret area and pull-in arrangement system and operation, prior to sailout from Keppel shipyard, as per Ref. P956-85-DWG-U-02156 Chain Pull-in Arrangement and Details Appendix B, 11011-AMC-INT-ME-DW-2004 Chain Handover Sequence Appendix B, 11011-AMC-INT-ME-DW-2005 Chain Pull-in Sequence Appendix B, 11011-AMC-INT-ME-DW-2006 Chain Tensioing Heading Sequence Appendix B, 11011-AMC-INT-ME-DW-2007 Field Layout and Mooring Leg Hook-Up Sequence
Establish rigging container at FPSO laydown area and transport required rigging to FPSO turret prior to sailout from Keppel shipyard, as per PE instructions on board, as per Ref. P956-00-DWG-G-00008 FPSO Perisai Kamelia General Arrangement Equipment List. Inspect chain stoppers and verify orientation rigging and chain stopper orientation, prior to sailout from Keppel shipyard, as per Ref. P956-85-DWG-U-02156 Chain Pull-in Arrangement and Details
Function test Pull-in Winch and trial fit to be performed (to be witnessed and signed by MWS and Contractor), as per Ref.
Inspect and re-tag scaffolding on the below and under chain table, as per Ref.

Offshore

Connect positioning vessels to FPSO bow and stern as per and establish positioning control of the FPSO, as per Ref. Appendix C, 11011-AMC-INT
Inspect messenger lines moussed through chain stoppers, as per Ref.
Survey chain table and ensure correct orientation for first chain hook-up based on 247.5 degrees FPSO heading, i.e. FPSO centerline shall be orientated 247.5, as per Ref.

LCR Preparation Works

Before commencement of chain recovery and handover to FPSO, preparation works shall be performed to prepare the LCR for recovery and handover of the mooring chain to the FPSO.

Status

· HIRA has been reviewed and the mitigation actions been put in place, as per Ref.
· Toolbox talk has been conducted with all personnel to be involved in the operation.
· Mooring System has been pre-laid and pre-tensioning
· Set up and test ROV on port side of LCR.
· Trial run for cutting of sacrificial sling for hook-up operation. This is prior to sailout from Pasir Gudang, as per Ref.

Set up and verify/test ROV hook mechanism. This is prior to sailout from Pasir Gudang, as per Ref.
Install chain hang-off frame on LCR stern. This is prior to sailout from Pasir Gudang, as per Ref. Appendix B, 11011-AMC-INT-ME-DW-3001 LCR Deck Layout Appendix D, 11011-AMC-INT-ME-DW-4023 Chain Hang-Off Plate Drawing Appendix D, 11011-AMC-INT-ME-DW-4001 Riser Working Platform Drawing
Hold Kickoff meeting onboard FPSO with all relevant personnel
Prepare 9 sets of sacrificial sling for lowering rigging on LCR.

Mooring Chain Recovery

The chains shall be recovered individually from the seabed to LCR stern deck using crane and handed over to the FPSO pull-in winch. After FPSO pull in winch connected to end chain and LCR crane connected to 7th link of mooring chain by sacrificial sling, chain will be lowered back to 25 metres from the seabed. Once FPSO pull in winch takes sufficient tension, ROV will cut sacrificial sling and disconnect the sling from the chain. Thus the FPSO pull-in winch starts to pull in the chain leg until the first link of chain is engaged in the appropriate chain stopper. The process will be repeated for all chain legs so that the first links of each chain leg are engaged in the chain stoppers.

Status

· HIRA has been reviewed and the mitigation actions been put in place.
· Toolbox talk has been conducted with all personnel to be involved in the operation.
· Check weather forecast report and all parties agreed for weather window required for chain hook-up operation. Limiting seastate 1.5m.
· Mooring System has been pre-laid and pre-tensioning
· FPSO and LCR have done their own preparation works

LCR is positioned over the end of the mooring chain (installed with subsea recovery rigging) (beginning with chain #8) as per Appendix B, 11011-AMC-INT-ME-DW-2002 Chain recovery Sequence. Vessel heading will be selected based on Site conditions and position of the FPSO during the chain recovery.
ROV is launched to locate exact location of the subsea recovery sling, as per Ref.
ROV hook assembly is connected to the aux hook line, as per Ref
ROV hook assembly is lowered into water and to within 5 meters of seabed, as per Ref.
ROV directs ROV hook assembly over end of mooring chain, as per Ref.
Using ROV, connect ROV hook to subsea recovery rigging master link
ROV moves away from connection and inspects the chain as it is lifted by the crane.
Note: The swivel has been added to attempt to eliminate any twists that may have formed in the chain during the installation.
Crane recovers chain to surface while the vessel moves the stern along the layback path as per Ref. Note: Load expected 18MT
Note: Stern is moved as close as possible while avoiding any hazardous areas (i.e. FPSO hull).
Haul chain over chain hang-off plate and slot in 10th chain link onto chain hang-off plate as per 11011-AMC-INT-ME-DW-2002. After chain secured on chain hang-off plate, lock the chain hang-off plate to add chain securing point, per Ref.
Note: ensure no side loading of ROV hook, swivel, etc during recovery to deck. Analysis shows tension In crane to be 19 tonnes during recovery (11011-AMC-HESS-ME-RA-3111 Mooring Installation and Hook-Up Analysis Report
Lower down the chain and lay chain on chain hang-off frame until end of chain on deck.
Disconnect crane wire. The subsea recovery sling assembly is disconnected from the chain and stored in a basket on deck. Note: chain hang-off frame SWL Reference:
Positioned chain end link at the stern ready for connection to FPSO pull-in rope, as per Ref. Note: The target link, defined as the chain link at the chain stopper when chain tensioning is complete and catenary angles are achieved, shall be identified by link counting and painted yellow for ease of identification when the target link has reached the chain stopper
Connect sacrificial sling as lowering rigging to 7th link of chain from chain end link as per 16002-EMA-OP-FPSO-DWG-0036 Detail 1B
Connect other end of sacrificial sling to aux crane line
Crane slowly haul in, take load of the chain

Initial Pull-in of Mooring Chain

The procedure for the retrieval of the pennant and pull-in wire and connection of the pull-in wire to the chain is detailed below.

While the LCR is recovering and preparing the chain, the FPSO will be adjusting its head (as required), passing the pull-in rope over the FPSO chain pull-in wheel, go through FPSO Chain J- tube and down to the chain table and chain stopper/chain fairlead.

During the initial payout of the pull-in rope, it will be marked with paint at regular increments to identify the approximate amount paid out at any given time to enable cross referencing of the chain hand-over sequence defined in the pull-in drawings. Refer to Appendix B, 11011-AMC-INT-ME- DW-2004 Chain Handover Sequence for sequence drawings of chain handover sequence from LCR to FPSO

Status

· HIRA has been reviewed and the mitigation actions been put in place, as per Ref. 11011-AMC-HESS-RM-RA-1301 Project Hazard Identification & Risk Analysis (HIRA)
· Toolbox talk has been conducted with all personnel to be involved in the operation.
· Check weather forecast report and all parties agreed for weather window required for chain hook-up operation
· Mooring System has been pre-laid and pre-tensioning
· FPSO and LCR have done their own preparation works
· One leg of mooring chain has been recovered and secured on LCR deck

Bring FPSO onsite using positioning tugs as per Appendix B, 11011-AMC-INT-ME-DW-2005 Chain Pull-in Sequence approaching from the West South West
Stabilize FPSO with turret positioned at the design center
Move LCR stern to within 55 meters of turret center

Chain Tensioning

After minimum 3 legs of mooring chains have been pulled in and hung off at their end links the FPSO will be considered to be “Storm Safe”. At this point, the two bow tugs can be removed and FPSO orientation maintained by the stern tug only however this shall be at the discretion of the Tow Master.

The LCR will continue hook-up of other 6 chains until all 9 chains are locked to chain stopper. After all 9 chains are locked; the LCR may depart location and proceed to complete other work during the tensioning of the mooring chains however the crew onboard the FPSO shall be capable of working independently of the LCR.

Chains will be tensioned using the FPSO pull-in winch to a final tension of approximately 56 MT (at the chain stopper) at 8.3m FPSO draft; Winch tension will be determined during the pull-in. To achieve the target catenary angle and target link at the chain stopper, it is expected that approx. 30 meters of chain will need to be pulled through each chain stopper and removed. This will be completed in three rounds of chain tensioning as follow with corresponding tensions and catenary angles. The final tension and length will be advised by the LMC representative on board.

Mooring system design engineer will oversee the engineering parts of chain tensioning; He will give instruction in related with chain tensioning operation in relation with how many links have to be pulled in in every round.

For each stage of tensioning, equivalent number of links to be removed is also provided for ease of reference. The total numbers of chain links that need to be cut has been analyzed and documented on P956-85-DOC-J-02183 Chain Cut Off Calculation.

Mooring system design engineer onboard will be finalizing the number of chain links pull-in during offshore execution.

Chain tensioning operation will be performed under the instruction of Client’s Mooring System Design Engineering Contractor and Client Rep onboard the FPSO who will ultimately provide acceptance of the tensioning operation. Sequence of chain pull-in and chain length pulled in each “Round” may also be adjusted at discretion of Mooring System Design Engineer (from LMC).

FPSO heading during chain tensioning has been selected based on prevailing weather conditions but is subject to change based on site conditions. Alternative headings suitability shall be evaluated onsite by field engineers. Refer Appendix B, 11011-AMC-INT-ME-DW-2006 Chain Tensioing Heading Sequence for FPSO headings during chain tensioning operations. The procedure for one stroke of chain tensioning is described below.

Chain catenary angle shall be measured using a digital inclinometer positioned on the chain stopper. The angle of the chain stopper shall be considered to be equal to the angle of the chain catenary. Chain angle measurement shall be performed during the final round of tensioning only as required by Client’s Mooring System Design Engineering Contractor and Client Rep onboard the FPSO.

Status

· HIRA has been reviewed and the mitigation actions been put in place. 11011-AMC-HESS-RM-RA-1301 Project Hazard Identification & Risk Analysis (HIRA)
· Toolbox talk has been conducted with all personnel to be involved in the operation.
· Check weather forecast report and all parties agreed for weather window required for chain hook-up operation
· Mooring System has been pre-laid and pre-tensioning
· FPSO and LCR have done their own preparation works
· All legs of mooring chain has been recovered and secured on FPSO chain stoppers

Route FPSO pull-in winch wire over J-Tube and lower to chain table, as per Ref.
Connect to end link using LLLC connector, as per Ref.
Hoist FPSO pull-in winch wire to remove slack from connection to Chain, as per Ref.
Hoist chain out of chain stopper allowing clapper to open, as per Ref. Appendix B, 11011-AMC-INT-ME-DW-2006 Chain Tensioing Heading Sequence
Note: Only designated personnel will be around operation area due to FPSO pull-in wire winch will be in high tension
Continue hoisting chain until end of stroke length or until the specified length is pulled through, as per Ref.
Secured chain using wire connected to 25t padeye on FPSO deck after end of stroke length or until the specified length is pulled through, as per Ref.
Lower chain onto chain stopper and slack FPSO pull-in winch wire., as per Ref. Appendix B, 11011-AMC-INT-ME-DW-2006 Chain Tensioing Heading Sequence. Note: Wire on FPSO deck take tension as securing point
Note: Set up flame cutting equipment including fire blankets and fire extinguisher at the chain stopper.
Cut link above locking link using flame cutting equipment avoiding dropping any cut-off sections of chain overboard. Ref: Photograph Captured at Keppel Shipyard
Note: Successful pull-through trials for the above steps have been completed at FPSO ship yard.
After completion of cutting the chain link, haul in FPSO pull-in winch wire to take tension. Open securing wire from chain on FPSO deck. Continue haul in FPSO pull-in winch wire which connected to excess chain link.. Hoist cut off chain section through chain J-tube until chain on FPSO deck
Note: Successful pull-through trials for the above steps have been completed at FPSO ship yard.
Stockpile cut off chain section on main deck for removal by deck crew. Chain shall be moved around on deck using tugger winch to the stockpile location.

CONTINGENCY PROCEDURES

Loss of FPSO Heading and Position Control During Chain Handover

If, during LCR installation activities within the FPSO swing circle, the positioning and heading control of the FPSO is not able to be maintained and the FPSO begins to swing towards the LCR, the following shall be performed,

Disconnect any lines between LCR and FPSO, e.g. chain pull-in rope
Move LCR away from FPSO turret center following as far as possible the chain corridor of the suspended chain
Continue to move until stern of LCR is more than 150 meters from FPSO swing circle
Abandon chain to seabed using abandonment rigging
Develop revised procedure for continuation of installation activities

Loss of FPSO Heading Control During Chain Tensioning

If, during chain tensioning of the mooring chains heading control of FPSO is unable to be maintained, the following shall be performed.

All Stop on chain tensioning activities
Pay out on FPSO pull-in winch wire until closest chain link is engaged in chain stopper
Slack FPSO pull-in winch wire until sufficient slack is available to allow for FPSO heading change
Maintain slack in FPSO pull-in winch wire until heading control is regained
Continue chain tensioning operation

Chain twist

If, during chain recovery and handover to FPSO, chain twist beyond allowable tolerances (5 degrees per link) is observed in chain, the following shall be performed

Recover chain to LCR stern
Disconnect FPSO pull-in winch wire (if already connected)
Pay-out chain until end link approaches chain hang-off plate.
Suspend end link on aux crane with stinger + swivel with chain catenary hanging vertically below
Release twist by means of swivel
Secured chain to LCR chain hang-off frame and continue handover operation to FPSO

FPSO Pull-in Winch Unable to Achieve Target Link

If, during chain tensioning activities, pull-in winch on FPSO is unable to tension chain sufficiently to pull target link into the chain stopper or achieve required chain departure angle, the following may be applied.

Connect second tug to FPSO at the port or starboard bow quarter (as required) using positioning bridle rigging as per Appendix C, 11011-AMC-INT-ME-DW-2001 FPSO Tow, Positioning and Heading Control Tug Arrangement
Apply tension to positioning bridle in the opposite direction of the chain being tensioned. Applied tension shall not exceed 50 MT.
While tension is being maintained by tug, continue chain tensioning operation on chain corresponding to tug position.
Reposition tug as required for subsequent chain tensioning