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Stabbert converts vessel

Stabbert converts vessel
Ocean Services has recently completed conversion of a former North Sea supply vessel into a state of the art DP2 deep sea construction vessel.

Ocean Services has recently completed conversion of a former North Sea supply vessel into a state of the art DP2 deep sea construction vessel.

Ocean Services, a member of Seattle's Stabbert Maritime Group of Companies, has recently completed conversion of a former North Sea supply vessel into a state of the art DP2 deep sea construction vessel, able to compete with newbuilds at a very attractive dayrate.

The 85 m x 18 m Ocean Carrier went directly on contract upon completion of the refit.

The shipyard division of Stabbert Maritime, Stabbert Yacht & Ship, was contracted to assist in the refit and DP upgrades with Ocean Services managing the project oversight.

The conversion took 12 months and involved a 100 person crew working around the clock on an all-encompassing, technically intensive project where every system onboard was rebuilt or replaced.

Vice President of Commercial Operations, Neal Forde, said, "the Ocean Carrier is a landmark for Ocean Services as well as for the men and women of the Pacific Northwest and Stabbert Yacht & Ship. To my knowledge no other Seattle facility has undertaken a DP2 installation and retrofit of a vessel of this scope."

The Ocean Carrier was originally built by Smith's Dock of Middlesborough, U.K., as a North Sea pipe carrier / supply vessel.

Prior to purchase by Ocean Services, the vessel was acting as a 4 point dive support vessel.

A major element of the conversion process on the ship was the addition of the diesel electric propulsion system.

The vessel was originally outfitted with a conventional mechanically driven CPP propeller system and two 360 degree rotational gill jets in the bow. In the conversion two diesel electric 1,000 hp Schottel stern tunnel thrusters were installed and each bow thruster was upgraded to an 1,100 hp diesel electric power system.

All DP2 power is supplied by three 3516 CATs rated at 2000 kW.

A Kongsberg K-Pos DP-21 dual redundant position system was installed and controls the ship while on station. The vessel is now a Lloyd's Register certified DP2 vessel.

The vessel's interior was completely removed and rebuilt. All steel was audio gauged and replaced as necessary to meet Lloyd's Register requirements. Interior tanks were coated and exterior of vessel blasted and painted. A moon pool was installed in the center of the ship to accommodate client specific activities and is large enough to handle a 12 man SAT diving bell.

A CAT C18, 425 kW house generator was installed as well as a 120kW Cat 3306 emergency generator. Virtually all other sub systems including but not limited to; mechanical, electrical, insulation, plumbing, navigation electronics and audio video were rebuilt or replaced new to meet Lloyd's Register requirements.

Primary characteristics of the Ocean Carrier include open deck space of 850 square meters, 3.7 m X 3.7 m moon pool, total horsepower in excess of 12,000hp for running propulsion, dynamic positioning system and deep-sea construction equipment, and accommodations for over 50 personnel.

Special emphasis was given to the active heave compensated hydraulic pedestal crane with a hook height of 35 m and lifting capacity of 15 0t on single part line.

Mike Woods, Owner of Puget Sound Hydraulics, and contractor on the job said, "the Ocean Carrier's refit literally transformed the vessel into a technically advanced ship competitively comparable to new purpose built DP2 vessels."

On DP sea trials the Ocean Carrier outperformed the DP capability plot and held within 4 tenths of a meter in 2 kts of current on the beam, 40 kts winds.


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