MAN B&W packages for Swire AHTSs

MAN B&W Diesel is to supply complete twin-screw medium speed propulsion packages for six 120 tonne bollard pull Anchor Handling Tug Supply Vessels (AHTS). The vessels will be built at the Batam, Indonesia, yard of Singapore’s Labroy Shipbuilding and Engineering and will be operated by Swire Pacific Offshore Limited, Singapore.

The first newbuilding is scheduled to be launched at the beginning of 2007, and the following vessels are planned to follow at two month intervals. The 2,100 dwt ans 66 metre long vessels have been designed by U.K.-based IMT Marine Consultants Ltd, with specific optimization for the worldwide operation of Swire Pacific Offshore activities.

The propulsion package for each ship will consists of two MAN B&W 9L27/38 engines giving a total main engine output of 2 x 3,285 kW and will supply the propeller thrust, for a bollard pull of more than 120 metric tons. The ship service speed is optimized for 13.5 knots. In addition, MAN will provide two Alpha AMG55 gearboxes, type 57VO55EV, with a speed reduction ratio of 800:141. Additionally, each gearbox is equipped with a 1,800 r/min PTO shaft for a 1600 kVA shaft alternator. Each vessel will be fitted with two MAN B&W Alpha type VBS980 four-bladed controllable pitch propellers. The 3,800 mm ducted CPP systems are complete with tail, intermediate shafts and bearings, stern tube equipment, and MAN B&W fixed propeller nozzles type AHT. In addition to the engine room control station, the Alphatronic 2000 Monitoring, Control and Safety System includes a main bridge control station and an aft bridge slave control station. The propulsion control is interfaced to a Joystick/Dyn Pos System, which manages the overall ship maneuvering via gyro compass, rudders and thrusters.