DNV GL approves underwater wet welding procedure

SEPTEMBER 2, 2014 — Classification society DNV GL says it has completed a joint research and development program with Subsea Global Solutions LLC (SGS), that will allow permanent repairs to be carried out by underwater wet welding on certain areas of vessels.

Subsea Global Solutions' network of coded welder divers will be available to perform these permanent repairs, on a case by case basis, utilizing this procedure in suitable locations throughout the world in accordance with the approvals given by DNV GL.

Over the last two and a half years, Subsea Global Solutions welded in excess of 80 groove weld test plates underwater at depth in its training facilities in Miami, FL, Long Beach, CA, and Terneuzen, the Netherlands. Non-destructive and mechanical testing of the plates was performed at the DNV GL lab in Hamburg, Germany. All data collected were shared between SGS and DNV GL during this procedure development program.

At the End of April 2014, test plates were welded in the training tank in Miami with a DNV GL welding engineer in attendance. The non-destructive and destructive testing was again performed at the DNV GL lab in Hamburg. Welding of the plates, as well as non-destructive and destructive testing, was performed in accordance with AWS D3.6M:2010 Class A. The results of the non-destructive and destructive testing were very positive with all welded test plates exhibiting metallurgical properties equivalent to permanent weld repairs performed "top-side" dry.

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