8/2/2019 Pds 15 Plem Rev021

1/4

Product Data SheetPDS-15: PLEMDate Issued:25.02.10Revision: 02Page: 1 of 4

Captain PLEM

Outline DescriptionThe Captain PLEM may comprise the following main functions:

Connection point between main pipe and branch pipe

Retrievable Pig Launcher / Receiver Structural Foundation and support structure for the diverless tie-in of pipeline in one

end and a spool tie-in in the other end. ROV operated ball valves for pipeline isolation

The PLEM is a connection point between the main pipeline and a subsea structure or a branchpipeline. The PLEM has facilities for pig launching and/or recieval. The header is equipped witha ball valve, to isolate the line, allowing recovery of the Pig Launcher / Receiver (PLR). Thebranch is equipped with a ball valve to isolate the line, allowing recovery of the spool, ifrequired.

The Captain PLEM is independent of type of connector and connection system. Theconnection system and pipe ends are normally Client Provided Items (CPI). The pipelineinboard is tilted to minimize pipeline tie-in moments and minimize free span.

The installation of the PLEM will be done after pipeline abandonment and removal of any endcaps / lay down heads. The pipeline will be resting on the seabed. The PLEM may be landed

with a glass-fiber reinforced plate that allows the PLEM to move with the pipe. The PLEM maybe fitted with a temporary guiding structure allowing a coarse alignment with the pipe. Theconnection system will lift the pipe and close the hub gap by pulling the PLEM towards thepipeline. Spool and pipeline tie-ins will be done by use of CPI tie-in tool contractor.

The PLEM size is dictated by the need of a PLR or a retrievable check valve module, since thePLEM structure is used as a landing platform for the PLR and the check valve module. Theadvantage with this solution is that retrieval / installation of PLR or check valve module can beperformed over the entire design life, without having to mobilize a conventional tie-in spread.The PLR connection will be made by a Nemo provided stroking tool.

8/2/2019 Pds 15 Plem Rev021

2/4

Product Data SheetPDS-15: PLEMDate Issued:25.02.10Revision: 02Page: 2 of 4

Technical DataDesign code: ISO 13628 -1 Subsea Production SystemsPipe Dimensions: 4 42Height to center pipe: 1000 2000 mmLength of structure: 6000 30000 mmWidth of structure: 3000 8000 mmHub tilt angle: 0 7Structural steel material: S355Design Life: 30 YearsTypical weight for 12IDx 8ID PLEM: 20 tonTypical weight for 28IDx 16ID PLEM: 150 ton

Due to the axial expansion in the pipeline, the PLEM foundation shall allow for movement and

transfer the expansion further into a spool. A rock dumped foundation is recommended for thispurpose.

Standard DocumentsThe Captain PLEM will be delivered with the following documentation:

GA and Assembly drawings PLEM Design Report PLEM FAT Report PLEM Outline installation Procedure PLEM Manufacturing Record Book

Options:The following options to the standardized PLEM are offered:

1. Provision of Connection SystemThis option covers the supply and integration of a nominated connection system intothe riser base, or, if a particular system is not nominated, for Nemo Engineering toselect the most optimal system. The scope of the delivery would be hub, porch andconnector (clamp or collet).

2. Remotely retrievable check valve module3. Pig Launcher / Receiver:

Nemo will provide a pig launcher / receiver for pre-commissioning operations. It will beconnected on the main pipeline hub and be delivered with a ROV disconnect clamp

4. Increased foundation area for soft seabed conditions;5. Protection Cover:

Protection for dropped objects can be provided by a roof structure that will withstandthe impact load. NORSOK U-001 guidelines will apply. Alternatively, a free standingGRP protection cover can be delivered.

6. GRP Sliding Plate for low friction axial movement due to pipe expansion7. Temporary guiding structure8. Spool between PLEM branch and other subsea structure9. Offshore support

8/2/2019 Pds 15 Plem Rev021

3/4

Product Data SheetPDS-15: PLEMDate Issued:25.02.10Revision: 02Page: 3 of 4

Project References:Figures below show typical PLEMs that are designed by Nemo Engineering:

Captain PLEMs Functional Requirements:

Tampen Link - Captain PLEMs, Size:32x16

Connection point between main pipe andbranch pipe

Retrieval Pig Launcher / Receiver PLR retrieval independent of tie-in tool Remotely retrievable check valve

module

Gja Captain PLEM, Size: 28ID x 16ID

Connection point between main pipe andbranch pipe

Retrieval Pig Launcher / Receiver PLR retrieval independent of tie-in tool Remotely retrievable check valve

module

Troll Captain PLEM, Size: 12ID x 8 ID

Connection point between main pipe andbranch pipe

Retrieval Pig Launcher / Receiver PLR retrieval independent of tie-in tool

8/2/2019 Pds 15 Plem Rev021

4/4

Product Data SheetPDS-15: PLEMDate Issued:25.02.10Revision: 02Page: 4 of 4

Required data for further study / budget price

Pipeline / Branch Nominal Diameter: _______________________________

Pipeline Design Pressure / Temperature _______________________________

Pipeline Material Quality: _______________________________

Insulation/Coating: _______________________________

Free issue items / CPI _______________________________

Option 1;

Nominated Connection System: _______________________________

Option 2;Retrievable check valve module: _______________________________

Option 3;Pig Launcher / Reciever _______________________________

Option 4;Soil Conditions: _______________________________

Option 5;

Protection Requirements: _______________________________

Option 6;Sliding Plate: _______________________________

Option 7;Guide structure: _______________________________

Option 8;Spool: _______________________________

Option 9;Offshore support: _______________________________

E-mail nemo@nemo-engineering.noPhone + 47 67 52 57 00Fax +47 67 52 57 01Web: www.nemo-engineering.no

http://www.nemo-engineering.no/http://www.nemo-engineering.no/http://www.nemo-engineering.no/http://www.nemo-engineering.no/http://www.nemo-engineering.no/http://www.nemo-engineering.no/