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Title: Hyperbaric Welding Of Offshore Pipelines
Author: W. Thomas Holden
Source: American Gas Association 1970
Year Published: 1970
Abstract: The need for making sub-sea code-quality welds has never been more apparent than in the last few years. With oil and gas production from areas of greater water depths, the pipeline industry has to reach out to take this production. But once pipelines are installed, it is difficult, and sometimes impossible, to bring a line to the surface for repair. Underwater welding meeting API 1104 code requirements allows us to now make in situ repairs of these lines. After three years of field experience we are optimistic that hyperbaric welding will have application in new construction. What is hyperbaric welding? It is any type of welding process made under ambient pressure conditions. The ambient pressure comes from the surrounding water at the working depth. The welding habitats used offshore are open bottom, and the inside pressure of the habitat, therefore, is the same as the surrounding water and varies with depth.

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