Cofferdam Set Up

This photographs show UMC setting up the biggest cofferdam system they have ever been involved. The cofferdam will allow repair to the leg wells and ultimately install the three legs of a jack up rig in Oman, which was damaged during Hurricane Katrina in the Gulf of Mexico, in 2005. SeaTec developed the detail design of the cofferdam from the outline design required by UMC, the finished product coming in at just over 100 metric tonnes with an overall diameter larger than 18 meters.

So far the cofferdam construction and testing has been completed, including the special seal system that will ultimately allow the cofferdam to be drained down and result in a massive maximum buoyancy upthrust of 1500 tonnes on the structure.  The challenge was to create a dry working environment around the giant support feet (known as spudcans) of a jack up oil rig so that repairs could be undertaken on the top surfaces of each foot whilst the unit was afloat.  The cofferdam system will completely enclose each of the spudcans in turn and seal against the underside of the rig hull, and when in position the area around the spudcan can be drained down thus allowing surface workers to carry out the necessary repairs.  This in-water repair system provides a cost-effective and practical alternative to docking.

More Launches For SeaTec

SeaTec is pleased to announce the successful launch and delivery of two gas carriers and one Aframax tanker, with delivery of another Aframax tanker scheduled for early December 2008.

These new vessels, built for the Arab Maritime Petroleum Transport Company (AMPTC), are the result of great team work between SeaTec and AMPTC. The project started in April 2006 with SeaTec advising on specifications for the two gas carriers. Following on from this stage, plan approval took place during the summer/autumn of 2007 with steel cutting for the first (GAS ALKHALEEJ) commencing on 6th August 2007 and delivery on 3rd September 2008. The second gas carrier (OCEAN GAS) was delivered 24th October 2008, about three weeks ahead of schedule.

Steel cutting for the first Aframax tanker (ALBURAQ) took place on 17th December 2007 with delivery on 6th October 2008. This will be followed by delivery of the second Aframax tanker (SEA LEGEND) on 6th December.

The gas tankers were built at Hyundai Samho Heavy Industries in Mokpo in southwest Korea. Both were equipped with a Hamworthy gas plant which enables the carriage of propane, butadiene, butane, butylene and propylene in independent tanks.

The Aframax tankers are designed to carry crude oil and petroleum products and were built in Hyundai Heavy Industries in Ulsan in eastern Korea.

Both sites were managed by SeaTec site staff with project management taking place in SeaTec Glasgow. Back up support was provided by SeaTec Shanghai whenever a quick management response was required by the owners on site.

SeaTec Celebrate Two New Launches

SeaTec celebrate the recent launches on consecutive days of two newly-built ships for which SeaTec provided expert guidance during construction.

WG Columbus is Western Geco’s newest seismic vessel launched at Hijos de J Barreras Shipyard in Vigo, Spain on Tuesday 3 June. SeaTec provided site supervision for the project as part of our contract with Western Geco to provide design, construction and support services for new build, conversion and refit projects.

On Wednesday 4 June, product tanker CS Weymouth was launched at Shenfei Group’s Fanshun Shipyard near Wenzhou, Zhenjiang Province in China on behalf of shipowner Courtney Fynn. For this project SeaTec provided project management, plan approval and site supervision services. CS Weymouth will undertake final commissioning and trials for delivery in August.

AMPTC Award LPG Carriers Newbuild Contract

In Q1 2007, AMPTC awarded the contract of plan approval for 2 x LPGC’s  (82,000m3). Steel cutting for the first Hull (S333) took place in August 2007, with steel cutting for the second taking place in November 2007. Full site supervision will be undertaken by SeaTec with additional support supplied by both SeaTec Glasgow and SeaTec Shanghai.

Eastern Spirit / Western Spirit Conversion

In Q2 2006, SeaTec were awarded the contract to undertake the feasibility study, design and Yard Supervision for the conversion of the Eastern Spirit Seismic Survey vessel. The vessel was originally a 6 streamer vessel but would return to service as a Q-Marine technology vessel capable of towing up to ten 6-kilometer seismic streamers. She was also to be equipped with DSC – Dynamic Spread Control.