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    Tidewater building Polish designed PSVs in China

    Vessel & ROV News // December 17, 2008

    Tidewater's new PSVs are designed by MMC Ship Design in Poland.

    Since their beginnings with the 1955-launch of Ebb Tide, the first purpose-built boats to serve the Gulf of Mexico offshore oil industry, Tidewater has been an industry leader. With over 400 vessels currently serving the oil industry worldwide the company is now the largest offshore support vessel operator in the world.  The fleet has been built by acquiring competitors but also by an extensive and systematic new construction programme.
    Currently the latest generation of platform supply vessels have completed the design phase. MMC Ship Design & Marine Consulting Ltd of Poland designed the vessels, 12 of which are being built in China at the Fujian Mawei Shipbuilding Ltd.

    The new class of PSVs will be diesel-electric. Each of the four electric generators will be turned by a Cummins QSK60-D(M) rated at 1,825kW. These provide the electrical power to the two motor-driven aft mounted azimuthing thrusters and two bow thrusters, a 910kW controllable pitch tunnel thruster along with an 800kW drop-down azimuthing thruster. Power will also be reserved for the vessel's cargo systems.The boats have a 14.3 knot design speed.
    In the choice of propulsion for the PSVs, Tidewater has moved to the efficiencies offered by diesel-electric technology. The great flexibility of this system allows for significant cost savings when a boat is on standby at an oil rig or maintaining slow speeds for exploration jobs.

    One or more of the engines can be shut down when full power is not required. When linked the vessel's dynamic positioning system, the diesel electric system can deliver just the right amount of power to the bow and stern drives while the diesel engines maintain a constant speed.
    The engines and generators will be mounted forward in the vessels' 87.2m by 18.8m by 7.4m hulls. The hulls will also have tanks with capacities for 945 cubic metres of fuel, 620 cubic metres of water, 1,800 cubic metres of ballast and/or drill water and 2,500 cubic metres of liquid mud. The vessels will also be methanol capable.
    They will be able to handle up to 3,550 tonnes of deck cargo on the 1,000 square metres of deck space. Deck equipment will include a stores crane two 10 ton tugger winches and a rescue boat. 

    Accommodation will be provided for a complement of 52 persons.

    The Vanuata-flagged vessels will be classed by ABS as + A1, (E) Offshore Support Vessel, AMS, DPS 2 and FFV Class 1. The first of the 12-vessel series will deliver in 2010.

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