SX-157 Ulstein Design

Germany-based Caterpillar Marine has been selected to provide propulsion solutions for four ocean-going towing vessels to be owned and operated by ALP Maritime Services, which was recently acquired by Teekay Services.

Designed by Ulstein Design and Solutions, each of the vessels will be powered by four 9 M 32 C propulsion engines, three Cat C32 auxiliary generator sets and a Cat C9 generator set, to provide emergency power.

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The vessels each have two AEM shaft generators on-board, as well as Cat BCP1330F main propellers, BTT625 tunnel thrusters and BTT419 tunnel thrusters.

Caterpillar Marine global offshore segment manager Alexander Kohse said: “Through our rigorous project management and close collaboration with Cat dealer, Pon Power, we have been able to seamlessly work with Ulstein to equip the vessels with performance solutions you can only get from Caterpillar.”

“The Cat BCP propellers are primarily designed for heavy-duty applications with the pitch-setting hydraulic servo cylinder in the hub, which is an oil circulating system.”

“As a result of the synergies we offer amongst our power, propulsion and comprehensive service offerings, shipyards and operators can rely on Caterpillar for more than ever before.”

Cat power and propulsion systems are slated for delivery over the course of 2015.

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The Cat BCP propellers are primarily designed for heavy-duty applications with the pitch-setting hydraulic servo cylinder in the hub, which is an oil circulating system with an integrated moisture monitoring system.

The Cat tunnel thrusters feature a modular design with modern transmission layout and custom-designed blades; they can be mounted and dismounted in the tunnel and powered by an electric motor or diesel engine.

Construction of the ULSTEIN SX157 design vessels will be carried out at the Niigata Shipyard in Japan.

The vessels are claimed to offer a 300t bollard pull and are capable of operating at full loads for 45 days without refuelling. They will be used to tow large structures, such as offshore drilling rigs.

Image: An illustration of ALP SX-157 Ulstein design. Photo: courtesy of Teekay Corporation.