Full service offshore and subsea infrastructure services contractor BISSO MARINE said it has completed a two-month saturation diving campaign in the U.S. Gulf of Mexico. Using its 126.4m x 30.4m construction barge Bisso Subsea Vision, configured with a 12-man ABS Classed 300m saturation system, BISSO MARINE performed a variety of subsea infrastructure services including several subsea abandonments in water depths ranging from 91m to 220m.
Other scopes of work included a Reverse 'J' recovery of several miles of unpiggable 6" pipeline from 122m of water. The 6" pipeline was lifted vertically through one of the moonpools on the BISSO SUBSEA VISION. The pipeline was vented, saw cut and scrapped within an enclosed decommissioning system designed to capture the contents of the pipeline.
The BISSO SUBSEA VISION also recently completed the lay and burial of several miles of bundled pipeline in the U.S. Gulf of Mexico in less than 60m of water. While the BISSO SUBSEA VISION moved on to its next decommissioning assignment, the bundled pipeline tie-ins will be performed using the company’s four point DSV Joseph Bisso.
All work was performed safely without downtime or incident.
The fully classed 12-man saturation system on the Bisso Subsea Vision has a three-man bell deployed through a moonpool and a side-launched hyperbaric rescue chamber (HRC). The Bisso Subsea Vision is configured with two pedestal cranes, the main crane having a 300-ton capacity and the auxiliary crane having a 60-ton capacity. The barge also features an eight-point mooring system capable of working in 300m. Other barge features include two project moonpools (2.4m diameter and a 3m diameter), a pipelay firing line system, significant open deck space, 100 bunks and a helideck rated for a Sikorsky S-76.