BP and Topaz Marine AHTS Vessels Choose L27/38 Power

By Peter Pospiech at July 18, 2013 04:53
Filed Under: Company News, MAN Diesel&Turbo, Offshore, Shipyards, Workboats

80-ton bollard pull vessels ready for anchor handling tug supply services

MAN Diesel & Turbo’s medium-speed propulsion   packages   have   gained another foothold in Middle Eastern offshore operations. After successfully completed sea trials, Abu Dhabi-based Adyard has earlier delivered the ‘Topaz Dignity’ – which is now followed by the ‘Topaz Triumph’ AHTS. Topaz Energy and Marine, a subsidiary  of  Oman-based  Renaissance  Services  SAOG  and  a  regional leader in providing offshore support  vessels  and  engineering services, has passed yet another milestone in its 35-year history by building two Anchor Handling Tug Supply vessels.

The  two  67-metre,  ’80-ton  bollard pull’ vessels are ready for anchor handling tug supply services and the transportation of dry and liquid cargo to and from pipe-laying barges, drilling platforms and production platforms for offshore operations. The Topaz Dignity will operate on behalf of BP, the oil and gas major, on a long-term-contract basis in the Caspian Sea – whilst Topaz Triumph may remain in the Middle East and be operated by Topaz Marine MENA. The state-of-the-art vessels are equipped with the latest technical equipment and are custom-built for Fi-Fi Class I and DP2 operations.

Propulsion package

The  twin-screw  propulsion  package  for  each  vessel  consists  of 8-cylinder, medium-speed  MAN L27/38 engines of 2,720 kW each, horizontal  offset  reduction  gear-boxes with a CPP servo oil distribution unit, and a 1,500 kW shaft alternator PTO. The gearboxes drive approximately 18-metre intermediate shafting and 13 metre propeller tailshafts in oil-lubricated stern tubes. The MAN Alpha CP Propellers are 2,800 mm diameter ducted, turning 198 rpm at MCR. The propeller thrust and pulling power are boosted by Alpha High Thrust nozzles, customised to hull integration with a length/diameter ratio (L/D) of 0.6. In the same vein, the Alphatronic 2000 Propulsion Control System is configured with twin control stations on both main bridge, aft bridge and in the engine control room – including interfaces to joystick and dynamic positioning systems.

Performance

Upon completing seatrials for the Topaz  Triumph  –  Topaz  Marine Project Manager,  Stewart  Smith, expressed his satisfaction with the propulsion system and vessel performance  in  general:  “Everything fulfilled  our  expectations.  Compared  to  the  estimated  design speed  of  13.5  knots  for  the  vessel, we even achieved a radically increased top speed of 15 knots”. Additionally, a bollard pull test verified the vessels’ pulling power specification by achieving a test result of 87 tons. 

 

Image/graph: courtesy of MAN Diesel&Turbo

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