GMG Shipbuilding & Heavy Industry of China has delivered 'AOS Power' to her owner Atlantic Maritime Group of the UAE, the very first vessel in the RAmpage 4500 class of anchor-handling tug/supply vessels designed by Robert Allan Ltd of Vancouver, Canada.
'AOS Power' is fully equipped for anchor-handling, ship-assist, long-distance towing operations, firefighting, deck cargo transfers, personnel transfer and other offshore support duties. She has a length overall of 45.00 metres, a beam of 15.00 metres, a depth of 6.75 metres and a draught of 5.55 metres. The vessel has been built and classed to Bureau Veritas Notations.
The propulsion machinery comprises a pair of Wärtsila 6L26 diesel engines, each rated 2,040kW at 1,000rpm, each driving Lips CS250 thrusters. On trials, AOS Power met all performance expectations, with a bollard pull ahead of 70 tonnes and a free running speed of 13.9 knots. Manoeuvrability is enhanced by a 400 kW controllable pitch electric bow thrusters.
Electrical power is supplied by three Caterpillar C18 gensets, each rated at 500 kW. Emergency power is provided by a Cummins 6CTA-M diesel genset, rated at 95 kW. Tank capacities include 525 cubic metres of fuel oil and 115 cubic metres of potable water.
The deck machinery comprises a single drum Hawser winch at the bow, a water-fall double drum Towing Winch on the aft together with other deck machinery to fulfill operation requirements such as stern roller, shark's jaw-top pin unit, gobeye, deck crane, tow hook, tugger winches, capstans, storage reel, etc.
The vessel has been outfitted for a crew of up to 25 people, although normal operating crew is 15. The large main deckhouse contains a spacious galley and mess, with cabins for senior officers and guests. The wheelhouse is designed for maximum all-round visibility with forward and aft control stations providing maximum visibility to both fore and aft deck working areas.
The RAmpage 4500 class tug is the newest member of the successful RAmpage series of offshore support tugs, developed by Robert Allan Ltd to address a gap in the market for smaller high-performance towing and anchor-handling tugs for critical offshore terminal and oil-field duties. The tugs are designed to be able to maintain station in extreme ocean conditions, with enhanced manoeuvring and sea-keeping capabilities.