Giant mooring system from Rolls-Royce

Mon, 04 April 2016

Rolls-Royce is to design the mooring system for the giant crane vessel ‘Sleipnir’.

The contract, worth £8 million to Rolls-Royce, will be delivered in conjunction with SembCorp Marine which is building the massive ship in its Singapore yard for Heerema Offshore Services.

The self-propelled vessel will be no less than 220m long with a beam of 102m and a displacement of 273,700 tonnes at maximum operational draft – and will have a large, reinforced work deck to deal with extremely heavy loads.

Sleipnir (named after Odin's eight-legged stallion) will be used to install and remove offshore facilities and place both floating and subsea structures in deep water.

Therefore the scale of the vessel demands a tailor-made 12-point mooring system, including electrically driven winches, fairleads, wire sheaves and control system. This means there are a dozen of these large winch units to install, each having an AC power draw of up to 400kW, fed by variable frequency drives. All this will result in a hoist capacity up to 3,000KN (around 300 tonnes).

Alongside this are to be a pair of Huisman tub mounted offshore cranes able to lift 10,000mt at 48m reach. The difference between these and more traditional designs is that the Huisman cranes will make use of large bearings rather than wheels or bogies to accomplish the slewing action. This allows for a substantial weight saving on the crane although the scale is still large: these cranes will still require slew bearings with a diameter of 30m.

The vessel is due to join the rest of Hereema’s fleet in the second half of 2018.

Source: Stevie Knight;

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