Thrusters adapted for giant newbuild Heerema semisubmersible crane vessel

Offshore staff

SINGAPOREHeerema Offshore Services’ new semisubmersible crane vessel under construction at the Sembcorp Marine Tuas Boulevard Yard will feature a wide range of Wärtsilä propulsion products, systems, and solutions.

On completion, the vessel will be the largest of its type in the world, Wärtsilä says.

Eight 5.5-MW Wärtsilä underwater mountable thrusters will provide accurate positioning of the vessel. The 8° tilted propeller shaft solution reduces significantly the interaction between the thrusters and the hull, thereby enhancing the vessel’s dynamic positioning performance, said Arto Lehtinen, vice president, Propulsion, Wärtsilä Marine Solutions.

Four of the thrusters, adapted for this project, are also retractable (type WST-65RU).

The four units installed at the aft of the vessel are WST-65U underwater mountable thrusters, and all eight are also suited to underwater demounting, so dry docking of the vessel is unnecessary for change-outs.

All are equipped with Wärtsilä Oceanguard anti-pollution face type seals, primarily because of the tough environments in which the thrusters will operate.

In addition, the contractor’s scope includes auxiliaries for steering and lubrication, control units, a propulsion condition monitoring service, and centrifugal pump packages. Deliveries will start at the end of 2016.

The vessel will feature two cranes with 10,000-metric ton (11,023-ton) lift capacity, beyond any heavy crane lifting that the marine contracting market currently offers, the contractor claims. It will also be self-propelled with a transit speed of 10 knots.


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