M/V SEA POWER

A2SEA own and operate two vessels, M/V SEA ENERGY and M/V SEA POWER.  Both vessels were originally feeder-type container ships but were converted by A2SEA in 2001 into self elevating crane ships, specifically designed to meet the requirements of the offshore wind farm market.

The vessels have four jacking legs operated by a wire pulley system, enabling the legs to take the weight of the vessel by raising the hull a short distance within the water.  This provides a stable platform from which crane operations can be performed.

The propulsion arrangement comprises diesel powered twin screw engines driving controllable pitch propeller drives, twin rudders that can operate independently and a bow thruster unit, making them quite manoeuvrable. With their own propulsion and heavy lift cranes the vessels are self contained so the operation does not depend on other supply vessels or tugs.

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Technical specification SEA POWER (113KB)
General Arrangement SEA POWER (602KB)

Crane

Both vessels are fitted with a “Demag CC2500 Crawler Crane” mounted on a specially designed pedestal, effectively making them an integral part of the vessel.  The main crane is used for the assembly and installation of the turbine on the offshore foundation.

The boom length can be adjusted to ensure the optimum configuration for any lifting requirement.  With a standard boom length of 48 metres the crane can lift up to 289 tonnes below the hook at a 9 metre radius, while 115 tonnes at 84 metres hook height can be achieved with the longest boom arrangement.

Additionally each vessel is fitted with two Hydralift duplex cargo handling cranes, each with a capacity of 40 tonnes at a 12m radius. These cranes can act as tailing cranes when tilting up tower sections and as pre-assembly cranes for assembling the rotor.

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48m Main Boom (331KB)
60m Main Boom (339KB)
60m Main Boom + 12m Boom - with 160 ton Ballast (390KB)