Mooring Systems’ 150t spooler for the BP Valhall flowline.
Aberdeen-based Moorings Systems has completed the installation of a flexible export flowline to transfer water to a DP tanker at the BP Valhall platform complex in the Norwegian North Sea. The project involved installation of 1160m of 6in flexible flowline, front end engineering, mobilisation of equipment, and offshore installation team.
Located in 70m of water, the Valhall complex consists of five separate, bridge-connected, steel platforms for quarters, drilling, wellheads, production and water injection respectively. In addition the field has two unmanned flank platforms, one in the south and one in the north, both around 6km from the field centre.
From its Montrose quayside facility, Mooring Systems deployed a 150t spooler containing five sections of Manuli hose (3 x 300m, 120m and 140m) on the DP vessel Olympic Zeus. The flowline was connected to the production platform using a specially designed hang off spool fitted to the end of the hose and the entire hose laid along the seabed away from the platform. A 20in Pusnes connector was fitted to the end of the hose, and laid on the seabed complete with pickup rope and marker buoys, for subsequent retrieval by DP tanker. The flowline was then leak tested and covered with concrete mud mats.