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Field Development design consideration. Gulfstar will have a variety of ? ow assurance chemicals employed, including onboard storage for over 1100bbl of methanol, and other ? ow-assurance chemicals such as asphaltine and paraf? n inhibitors. There is also storage for more than 10,000bbl of high quality, treated ‘dead oil’ onboard the spar that can be used to ? ll and preserve ? owline functionality in the event a shut-in is required.

The spar-based FPS will have 60,000b/d of oil handling capacity - and 135mmcf/d of gas capacity (with the potential to expand to

COURTESYCRAYMEDIA

Figure 3. Subsea layout of Tubular Bells project. 200mmcf/d), and provide seawater injection services.

American states. This will create with design requirements similar to Wood Group’s Alliance about 1000 jobs. The major Tubular Bells, including Engineering was awarded an components, the hull and topsides, 3000-8500ft water depths and engineering and design contract are being built at Aransas Pass, compliance with new maximum for the topside decks and facilities.

Texas, and Houma, Louisiana, storm speci? cations. The three-deck topsides include respectively. Given the water depths, the long processing and seawater-injection Williams expects Gulfstar’s offsets to the hub and substantial equipment, utilities, personnel standardized design to be used length of the ? owlines (Figure 3), accommodations, pumping economically on other projects ? ow assurance will be a signi? cant and gas compression for export, oedigital.com January 2013 | OE 71 oe_topsides.indd 71 03/01/2013 13:57