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2. Commercial offshore diving - Wikipedia

   en.wikipedia.org/wiki/Commercial_offshore_diving

   Much of the offshore seabed diving work is inspection, maintenance and repair of the blow-out preventers (BOPs) and their permanent guide bases. The primary functions of a blow-out preventer system are to confine well fluid to the wellbore, provide a way to add fluid to the wellbore and to allow controlled volumes of fluid to be withdrawn from the wellbore.

3. Hyperbaric welding - Wikipedia

   en.wikipedia.org/wiki/Hyperbaric_welding

   The applications of hyperbaric welding are diverse—it is often used to repair ships, offshore oil platforms, and pipelines. Steel is the most common material welded. Dry welding is used in preference to wet underwater welding when high quality welds are required because of the increased control over conditions which can be maintained, such as ...

4. Underwater work - Wikipedia

   en.wikipedia.org/wiki/Underwater_work

   Underwater welding (salvage, ships husbandry, offshore) Use of pneumatic and hydraulic power tools (ships husbandry, civils, offshore, salvage} High pressure jetting (ships husbandry, civils, offshore) Hydraulic bolt-tensioning (offshore oil and gas) Fitting and maintenance of wellhead components (offshore oil and gas)

5. List of welding codes - Wikipedia

   en.wikipedia.org/wiki/List_of_welding_codes

   Underwater welding (Offshore & inland pipelines) AWS D8.1: Automotive spot welding AWS D8.6: ... Certification of welding inspection organizations W178.2-14:

6. Underwater construction - Wikipedia

   en.wikipedia.org/wiki/Underwater_construction

   Underwater cutting and welding, may be necessary, though in most cases it can be avoided in new construction. Commercial diving , is used when necessary or when it is an economical alternative, when work must be done by a human operator at an underwater worksite.

7. Positive pressure enclosure - Wikipedia

   en.wikipedia.org/wiki/Positive_pressure_enclosure

   A positive pressure enclosure, also known as a welding habitat or hot work habitat, is a chamber used to provide a safe working environment for performing hot work in the presence of explosive gases or vapors. They are commonly used in welding environments and are associated with the offshore oil industry. [1]