Subsea pipeline contract
A contract worth some NOK 160 million for subsea work to install a gas pipeline in the North Sea has been awarded by Statoil to the Stolt Rockwater joint venture (SRJV).
Due to tie the Gullfaks A and C platforms to Statoil's Statpipe transport system, the new line will carry gas from Gullfaks and the Gullfaks South, Rimfaks and Gullveig satellites.
The contract has been placed by the Gullfaks satellites phase II export pipeline (GFSE) project, and includes the installation of external risers on both platforms, seabed valves and hook-up with Gullfaks A and C.
It also covers a hot tap operation to tie the new pipeline to Statpipe. This means the work will be done without shutting off the flow of gas through the main line.
Water depths in the relevant area range from 135-125 metres. Work in less than 180 metres will be largely performed by divers, explains GFSE manager Geir Mellgren.
"The valve station alongside Gullfaks C is to stand in 215 metres of water. This will be hooked up with the aid of a newly-developed tool for diverless connection of flanged pipe ends."
Subsea work is scheduled to start next June and should take 65-75 days. Plans call for the hot tap on Statpipe to start in early August.
The schedule specifies that new export line will be ready to receive gas in February 2001.