{"id":1004,"date":"2014-07-01T14:00:59","date_gmt":"2014-07-01T06:00:59","guid":{"rendered":"http:\/\/alfanso10.com\/?p=1004"},"modified":"2017-01-08T14:34:17","modified_gmt":"2017-01-08T06:34:17","slug":"4-8-plet","status":"publish","type":"post","link":"https:\/\/alfanso10.com\/?p=1004","title":{"rendered":"12” & 4.5” Pipeline End Termination (PLET)"},"content":{"rendered":" <\/p>\n
COMPANY: EMAS-AMC (SUBCONTRACTOR)<\/span><\/strong><\/p>\nPROJECT TITLE: Liwan Deepwater Project<\/span><\/strong><\/p>\nCLIENT: Husky Oil China<\/span><\/strong><\/p>\nCONTRACTOR: SAIPEM<\/span><\/strong><\/p>\nLOCATION: CHINA<\/span><\/strong><\/p>\nYEAR:\u00a02014<\/span><\/strong><\/p>\nVESSEL: Pipe Lay Barge (PLB) Lewek Centurion<\/span><\/strong><\/p>\nLewek Centurion is a self-propelled DP2 S-lay pipeline installation vessel, The vessel measures 146.5m long by 30m wide (35m wide included the external thrusters), with mean operating draft of 7.8 m. The pipe lay ramp is located on the center of the barge and runs the entire length of the barge.<\/span><\/p>\nThe vessel is equipped with one pipe transfer crane and one shipboard crane. The pipe transfer crane has a maximum capacity of 36MT at 30m radius, and the shipboard crane has a maximum capacity of 20MT at 25m knuckle boom. The main crane is a 300 MT Kenz crane at 15-16m radius.<\/span><\/p>\nLCE is also equipped with 300mT A-Frame and retractable Hang off Platform at port side with 300mT capacity at maximum retraction.<\/span><\/p>\nAll of the vessel 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 an S61 helicopter.<\/span><\/p>\nSCOPE OF WORK<\/span><\/strong><\/p>\nThe scope of work for the PLET installation using pipelay installation vessel Lewek Centurion is described below:<\/span><\/p>\n\n- Recover the pipeline to surface using 300mT A-Frame and cross haul to Main crane<\/span><\/li>\n
- Hang-off pipe in Hang-Off Platform<\/span><\/li>\n
- Cut-off the laydown head and prepare pipe end for welding<\/span><\/li>\n
- Transfer the PLET from the supply vessel to LCE, upend the PLET and position on to\u00a0PLET support frame<\/span><\/li>\n
- Align PLET piping with pipeline and perform tie-in weld, NDT and Field Joint Coating<\/span><\/li>\n
- Deploy pipeline and PLET to seabed with crane and cross haul to A&R wire.<\/span><\/li>\n
- Perform PLET as built survey<\/span><\/li>\n<\/ul>\n
PLET installation is for empty condition. Flooded\u00a0condition is considered as a contingency plan.<\/span><\/p>\nMY\u00a0INVOLVEMENT:<\/span><\/strong><\/p>\nI was on board LCE to install both 12” & 4.5” PLET<\/span><\/p>\nINTRODUCTION<\/span><\/span><\/strong><\/span><\/p>\nEMAS-AMC was subcontracted by Saipem to perform the installation of pipelines as part of\u00a0Liwan 3-1 Area Facilities Development Project. The works involved installation of two (2) pipelines\u00a0including its pipeline end terminals (PLET\u2019s), four (4) in total, and lifting support of two (2) spools\u00a0which will be installed offshore in South China Sea, approx. 300 km south from Hong Kong in a\u00a0water depth range from 1100 to approx. 1400 meter.\u00a0EMAS-AMC mobilized its pipelay vessel, the Lewek Centurion, end of March 2014 in\u00a0Singapore for an arrival date of 28th April 2014 at latest in Shekou, China, for inward clearances\u00a0and pipe load out. The installation activities were\u00a0estimated to last approximately two (2) months.<\/span><\/p>\nPLET General Data<\/u><\/span><\/p>\nThe PLET main components are piping, valves and its protecting procedure, the hub and its support, the mudmat and the yoke.\u00a0<\/span><\/p>\n12\u201d PLET Data<\/span><\/p>\n\n\n\n| ITEM<\/span><\/td>\n | 12\u201d Pipeline<\/span><\/td>\n<\/tr>\n\n| PLET 7 (P7)<\/span><\/td>\n | PLET 8 (P8)<\/span><\/td>\n<\/tr>\n\n| Length Overall (LOA)<\/span><\/td>\n | 11.2 m<\/span><\/td>\n<\/tr>\n\n| Height, Mudmat folded<\/span><\/td>\n | 3.33<\/span><\/td>\n<\/tr>\n\n| Height, Mudmat open<\/span><\/td>\n | 3.13m<\/span><\/td>\n | 3.13<\/span><\/td>\n<\/tr>\n\n| Width, Mudmat folded<\/span><\/td>\n | 3.0m<\/span><\/td>\n<\/tr>\n\n| Width, Mudmat Open<\/span><\/td>\n | 8.194m<\/span><\/td>\n<\/tr>\n\n| Nominal Pipe Size<\/span><\/td>\n | 12 inches<\/span><\/td>\n<\/tr>\n\n| Pipe Grade<\/span><\/td>\n | API 5L X-65<\/span><\/td>\n<\/tr>\n\n| Pipe material<\/span><\/td>\n | Carbon Steel<\/span><\/td>\n | 316L CRA \u2013Clad Lined Carbon Steel<\/span><\/td>\n<\/tr>\n\n| Weight, in Air<\/span><\/td>\n | 36.3 mT<\/span><\/td>\n | 36.5 mT<\/span><\/td>\n<\/tr>\n\n| Weight, in Water<\/span><\/td>\n | 30.8 mT<\/span><\/td>\n | 30.5 mT<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n 4.5\u201d PLET Data<\/span><\/p>\n\n\n\n| ITEM<\/span><\/td>\n | 4.5\u201d Pipeline<\/span><\/td>\n<\/tr>\n\n| PLET 6 (P6)<\/span><\/td>\n | PLET 9 (P9)<\/span><\/td>\n<\/tr>\n\n| Length Overall (LOA)<\/span><\/td>\n | 7.89 m<\/span><\/td>\n<\/tr>\n\n| Overal Height<\/span><\/td>\n | 2.25 m<\/span><\/td>\n | 2.15<\/span><\/td>\n<\/tr>\n\n| Overall Width<\/span><\/td>\n | 3.0m<\/span><\/td>\n<\/tr>\n\n| Nominal Pipe Size<\/span><\/td>\n | 4.5 inches<\/span><\/td>\n<\/tr>\n\n| Pipe Grade<\/span><\/td>\n | API 5L X-65<\/span><\/td>\n<\/tr>\n\n| Pipe material<\/span><\/td>\n | Carbon Steel<\/span><\/td>\n<\/tr>\n\n| Weight, in Air<\/span><\/td>\n | 7.5mT<\/span><\/td>\n | 7.7mT<\/span><\/td>\n<\/tr>\n\n| Weight, in Water<\/span><\/td>\n | 6.5mT<\/span><\/td>\n | 6.6mT<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n PLET Installation Target and\u00a0Installation\u00a0Tolerance<\/u><\/span><\/p>\nThe target coordinate and tolerance for the PLET installation is provided in the following table:<\/span><\/p>\n\n\n\n| ITEM<\/span><\/td>\n | Position<\/span><\/td>\n | Tolerance<\/span><\/td>\n<\/tr>\n\n| EAST<\/span><\/td>\n | NORTH<\/span><\/td>\n | Heading<\/span><\/td>\n | Lateral<\/span><\/td>\n | Longitudinal<\/span><\/td>\n | Heading<\/span><\/td>\n<\/tr>\n\n| PLET 6<\/span><\/td>\n | 337748.35<\/span><\/td>\n | 2205914.48<\/span><\/td>\n | 206.5 o<\/span><\/td>\n | \u00b13 m<\/span><\/td>\n | \u00b15 m<\/span><\/td>\n | \u00b12.5 o<\/span><\/td>\n<\/tr>\n\n| PLET 7<\/span><\/td>\n | 337755.43<\/span><\/td>\n | 2205895.97<\/span><\/td>\n | 209.1 o<\/span><\/td>\n<\/tr>\n\n| PLET 8<\/span><\/td>\n | 351846.97<\/span><\/td>\n | 2217132.30<\/span><\/td>\n | 168.5 o<\/span><\/td>\n<\/tr>\n\n| PLET 9<\/span><\/td>\n | 351829.87<\/span><\/td>\n | 2217116.60<\/span><\/td>\n | 168.4 o<\/span><\/td>\n | \u00b12 m<\/span><\/td>\n | \u00b13 m<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n <\/u>FIELD LOCATION<\/span><\/span><\/strong><\/p>\n <\/p>\n LOADOUT & TRANSPORTATION<\/span><\/span><\/strong><\/u><\/span><\/p>\n<\/u><\/u>The PLET was fabricated in China yard<\/span><\/p>\nPLET INSTALLATION AID<\/span><\/span><\/strong><\/u><\/span><\/p>\nPLET\u00a0Support\u00a0Frame Stabbing Guide<\/span><\/strong><\/p>\n<\/u>The PLET Support frame was installed on Hang off platform. The main purpose is as a bumper and horizontal support of the PLET while upend and hold by crane prior tie-in to the pipeline.<\/span><\/p>\nThe support frame was equipped with hydraulic jack on top of the frame to adjust the angle of the PLET or adjust the alignment prior install the external clamp. The hydraulic jack had a max. Stroke length of\u00a0700mm with 8.2mT and 6.2mT push pull capacity respectively. This main function of this hydraulic jack is to push forward the PLET to ensure the cone insert the stabbing frame.<\/span><\/p>\nIn order to ensure that PLET was\u00a0aligned with the pipeline below, HOP was also provided with a stabbing guide. The stabbing guide can be adjusted to meet the required installation angle of the pipeline on HOP.<\/span><\/p>\nThis stabbing guide vertical angle can be adjusted from range 0 \u2013 4 deg. by changing pin location on the guide.<\/span><\/p>\nBuoyancy Modules<\/span><\/span><\/strong><\/p>\nBuoyancy module was required to compensate the weight of the PLET during lowering it to seabed. The net buoyancy required to install the PLET is summarize in below table.<\/span><\/p>\n\n\n\n| Item<\/span><\/td>\n | Net Buoyancy (mT)<\/span><\/td>\n<\/tr>\n\n| 12\u201d PLET<\/span><\/td>\n | 27<\/span><\/td>\n<\/tr>\n\n| 4.5\u201d PLET<\/span><\/td>\n | 5.5<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Hang Off Platform (HOP) & Clamp<\/span><\/span><\/strong><\/p>\nThe main function of the Hang off Platform was\u00a0to carry out full catenary of the pipeline once it is recovered in J-configuration with Max. Load capacity is 300mT.<\/span><\/p>\nThe HOP came\u00a0with a clamp for closing and locking the pipeline via hang off collar clamp. The Hang off collar clamp capacity is max. 300mT.<\/span><\/p>\nShim plate was installed on top of hang-off collar to adjust the pipeline angle requirements.<\/span><\/p>\nExternal Line-Up Clamp<\/span><\/span><\/strong><\/p>\nSubcontractor designed and fabricated external line up clamp to align pipeline and PLET pup piece prior welding.<\/span><\/p>\nCollar Protector<\/span><\/span><\/strong><\/p>\nSubcontractor has been design and fabricated collar protector to protect pipe collar during abandon the pipeline in S-Lay mode. This protector was removed once the pipeline rise up on the surface and collar protector above the HOP.<\/span><\/p>\nPLET Upending Frame<\/span><\/strong><\/p>\nPLET was transferred from Contractor supply vessel to LCE and landed on PLET upending Frame. PLET upending frame was installed on top of firing line of LCE Deck.<\/span><\/p>\nPLET mudmat opening, laydown rigging installation, hold back rigging installation and Buoyancy rigging installation to the Yoke was done when PLET sitting on the upending frame. Cutting of the pup piece for P6, P7 and P9 was\u00a0also be done on this stage. Due to height of upending frame is about 4m above the top of the firing line, scaffolding was required as\u00a0this was considered\u00a0as a working at height which required full body harness for those people involved.<\/span><\/p>\nPLET TIE-IN WELD GENERAL INFORMATION<\/span><\/span><\/strong><\/u><\/span><\/p>\nPipe Cutting and Bevelling Machine<\/span><\/strong><\/p>\n | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |