Vessel adds Subsea Versatility
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Vessel adds Subsea Versatility


Due to enter service in May the 4,500 dwt Polar Prince will add a versatile, subsea engineering capability to the fleet controlled by Bergen-based Rieber Shipping. Designed for inspection, maintenance, repair and subsea construction tasks, and built in southern Norway by Flekkefjord Slipp & Maskinfabrikk, Polar Prince incorporates two moonpools, heavy duty craneage and a Class II dynamic-positioning capability.
Polar Prince has been purpose-designed for the highly demanding, precision tasks she will be required to undertake in difficult offshore conditions. She thereby promises very low motion characteristics, low noise, and high redundancy in all operating modes and long-duration operational autonomy. As a mark of her trade, the new ship incorporates two moonpools, one of which is intendedfor lowering modules, while the other is designated for remote-operated vehicle (ROV) deployment.
The capacity and flexibility of the newbuild are expressed in a port side opening and hangar for a second work-class ROV, and provision for a third ROV to be handled from the upper deck by way of a light crane.
The main deck aft provides more than 1,000 sq m of working area. A pedestal-mounted, heave-compensated offshore crane is fitted on the starboard side aft, designed for 75-tonne lifts at 11 m radius down to an astonishing 2,000 m water depth. Capacity is alternatively in excess of 120 tonnes at 11 m outreach with double-fall reeving, and up to 150 tonnes in harbour waters.
In addition, the vessel is equipped with a 100 tonne-capacity A-frame over the stern, into which has been incorporated a 60-tonne roller. As well as light subsea construction and intervention, Polar Prince has been designed to support various Sonsub trenching machines for cable and flowline burial, trunkline trenching, excavation and other jobs.
She is installed with German-manufactured main machinery in the shape of twonine-cylinder MaK medium-speed M32-series engines, delivering 4,320 kW apiece at 600 rev/min. Drive is through Renk Tacke reduction gearing to a pair of nozzled, controllable pitch propellers supplied by Kamewa, in an installation offering a 150-tonne bollard pull capacity. Slow-speed course-keeping precision and manoeuvrability should benefit from the specification of high-lift rudders. Calm water speed at maximum continuous output is expected to be 13 knots, with an approximate daily fuel consumption of 25 tonnes, while a more economic daily burn of 16 tonnes is projected from operation at 11 knots in such conditions.
For a vessel of her size, Polar Prince has an enormous electrical appetite, to the extent that the installed power rating based on the main gensets and shaft alternators is 9,800 kW. The Brunvoll thruster plant alone has an aggregate maximum power absorption of 5,080 kW, since it comprises tunnel thrusters of 1,180 kW and 800 kW plus a 1,500 kW retractable azimuthing unit forward, and 800 kW transverse and 800 kW retractable azimuthing thruster aft.
Classed by Det Norske Veritas, she employsa Kongsberg Simrad dp system embracing multiple reference systems, with station-holding exercised through the remarkable Brunvoll thruster outfit.
The engineering installation combines increased economy and heightened safety and propulsive power redundancy by means of the adoption of arrangements in the transmission machinery for both power take-off and power take-in (PTI) modes.
Each of the shaft generators, using rotational energy delivered from the main engine crankshaft to provide electrical power at sea, has an output of 2,700 kW. The PTI arrangement enables the shaft alternator to function, if required, as a motor acting on the propulsion shaft, drawing on electrical energy fed from the main gensets. The two main aggregates are based on MaK 8M25 engines, giving a unit generator output of 2,200 kW.
More information: Lloyd's List


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