Anchor-handling tug supply (AHTS) vessel
Sea Eagle 1 is a 12,000bhp anchor-handling tug supply (AHTS) vessel owned by Norwegian offshore supplier Deep Sea Supply. It is used to supply oil rigs, tow them to the destination and anchor them up. Deep Sea Supply bought the vessel from ship builder Jaya Holdings in April 2009.
Deep Sea Supply had agreed to charter the ship under a bare-boat charter agreement till July 2010 and then purchase it. However, the agreement was renegotiated and Deep Sea Supply purchased the vessel on improved terms, which saved the company approximately $6m.
The vessel is currently hired for anchor handling / towing / supporting a drilling rig in the Russian island of Sakhalin.
Sea Eagle 1 design
Sea Eagle 1 has an overall length of 75.40m, a waterline length of 71.99m, moulded breadth of 16.80m, and moulded depth of 7.5m. The vertical distance between waterline and bottom of the hull is 6.10m. This enables the vessel to navigate safely. The vessel has a gross tonnage of 2,900t.
It has a class notation of A1E offshore support vessel, firefighting class 1 + AMS + DPS2 + ACCU.
At 6.1m draught, Sea Eagle 1 can carry a maximum weight of 2,300t without submerging. The 600m² deck area can load up to 800t of cargo. Liquid cargo including 1,230m³ of fuel, 490m³ of fresh water, 10m³ ballast / drill water, 560m³ of liquid mud, 140m³ base oil and 226m³ bulk cement can be stored on the vessel.
The main propulsion of Sea Eagle 1 comes from two Wartsila 9L32s engines. Each of the two engines can develop a maximum continuous revolution (MCR) of nearly 5,440bhp on site. It provides an output of 4,500kw at 750rpm.
There are two identical caterpillar 3408DITA main generators producing 410kW at 1,800rpm. Both the generators are rated at 370kW and 440V three-phase 60Hz. An emergency caterpillar 3408DITA generator, producing 60kW at 1,800rpm, is also rated at 60kW and 440V three-phase 60Hz.
The ship includes two CP propellers and two Lips 400mm blades. It also includes two 2,300kW at 1,800rpm shaft alternators to provide alternate current to the mains.
To improve manoeuvrability, the ship is equipped with two Kawasaki KT-88B3 bow thruster units. The units are 680kW tunnel type and are operated by an electric motor. It produces a propeller thrust of 10.5t.
The vessel can demonstrate 14kt speed, loaded, and a minimum bollard pull of 140t. At full load, the ship consumes 40m3 of marine gas oil throughout the day.
For anchor handling and towing, Sea Eagle 1 is outfitted and equipped with an anchor windlass and winch system. The anchor windlass consists of one Braattvaag BFMG 63046-type drum operated on electrohydraulic power.
Suitable for 230m×60mm polypropylene rope, the drum has a pulling power of 17t at up to 15m a minute.
The winch also includes a warping drum and gypsies suitable for 46mm chains. There are two identical bow anchors, two electrohydraulic capstans (each 8t at up to 25m a minute) and a 467.5m-long chain.
There are also two 10t tugger winches, operated by electrohydraulic power.
The towing winch has one electrohydraulic-operated double towing Brattvaag SL300W/BSL300W drum. The upper drum has the capacity to tow 2,000m×76mm, while the lower drum has an anchor handling capacity of 2,000m×76mm SWR. The brake holding capacity for both the drums is 450t.
The ship is ideal for a crew of 40. There are ten single-berth cabins and 15 double berth cabins. All the cabins are fully air-conditioned and have separate washrooms. There is also a cabin dedicated to hospital needs.
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