Six Thrusters Launched from Thrustmaster

Posted by Eric Haun
Tuesday, December 03, 2013
Photo: Thrustmaster

Six Thrustmaster 5,000 HP (3,700 kW) Azimuth DP3 Thrusters classed by ABS were launched on November 25, 2013 during the OOS Gretha naming ceremony.

The Brazil bound semisubmersible drilling rig was built at its ship yard in Yantai, China by CIMC Raffles and is due to work for Petrobras offshore.

CIMC Raffles said it is the first asymmetric semisubmersible unit without bracing in the world.

This reduces the towing resistance and dynamic positioning load, improving self propelled transit speed from an average 8 knots to more than 12 knots.

The asymmetric pontoon outline, with pneumatic de-ballast system, also aids quick ballast adjustment, to suit heavy lifting operation.

The OOS Gretha is 137.5m-long, 81m-wide, 39m deep (base line to main deck), with a maximum variable load of 7070-ton. It can accommodate 618 people.

The vessel has two 1,800-ton offshore mast cranes, which can perform tandem lifting, and it can withstand more than 22m wave height, says CIMC. Its specification means it can work in West Africa, Brazil, Gulf of Mexico and the North Sea, added CIMC.

thrustmastertexas.com
 

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