FOUNDATIONS FOR SUBSEA PIPELINE ACCESSORIES

摘要

A pipeline (12) including an accessory (10) such as a flowline end termination or an in-line tee is lowered to the seabed (124) and a mudmat foundation (62) is subsequently lowered toward the seabed for subsea docking with the accessory to provide a permanent foundation support for the accessory. Once docked and with a mudmat of the foundation landed on the seabed, weight loads of the accessory structure (10) and the attached pipe (12) are transferred to the mudmat (62) to provide a permanent foundation for the accessory structure. Before and during installation of the mudmat foundation, the pipe may be allowed to become embedded in the seabed. Temporary interim support such as buoyancy (118) may be provided to the accessory (10) to limit embedment into the seabed (124).