Liverpool Bay piggybacked gas pipeline installed with bottom tow
- Land and Marine Engineering Ltd., Bromborough (United Kingdom)
Landfall at Point of Ayr, North Wales, for BHP Petroleum`s Liverpool Bay development pipeline was accomplished with minimal disturbance to seabed and beach. The 2.7 mile, 20-in. gas pipeline consisted of a series of 600-m pipe strings fabricated at a Point of Ayr construction site. Piggybacked onto the line were twinned 3-in. condensate pipelines. The strings were pulled into position by bottom-pull with an 800-metric ton (mt) capacity winch spread on a marine barge. When the pulling was complete, the pipelines were buried in the seabed with a submarine trenching machine operated from two work barges. Use of a trenching machine was preferred to extensive dredging and backfill. The article discusses the feasibility study, the Welch Channel area, planning and construction, pipestring fabrication, channel excavation, wire laying, pipe pulling, trenching, and reclamation of the beach.
- OSTI ID:
- 153745
- Journal Information:
- Oil and Gas Journal, Journal Name: Oil and Gas Journal Journal Issue: 52 Vol. 93; ISSN 0030-1388; ISSN OIGJAV
- Country of Publication:
- United States
- Language:
- English
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