Hyperbaric repair to subsea gas pipeline, Romania

Supply of engineering, welder coding, project management, habitat manufacture and all personnel for gas pipeline repair in the Black Sea. Development of procedures and welder coding was completed at the DCN facilities in Bergen op Zoom.
A 6” pipeline was “piggy‐backed” off an unburied 20” inch gas pipeline installed on the seabed. Welding was required in two locations on the 6” pipeline to repair and install a 31m long spool piece in water depths of 48m. To achieve the required welding quality, the spool piece had to be installed and welded under hyperbaric (dry) conditions, according to a qualified PQR and utilising certified (coded) hyperbaric welders. (2011)