Ulstein Supplies Revised Thrusters, K-Series Engines
Ulstein Maritime Ltd. in Canada has developed a new version of its successful series of deck-mounted Z-drive thrusters, and has added another fixed pitch retractable thruster to its range. The previous Z-drive thruster incorporated a kick-up arrangement to eliminate damage when grounding — a feature deemed unnecessary during inservice situations. In the newly revised model, the thruster can still be hydraulically lifted clear of the water for inspection, maintenance, and propeller access, if the drive shaft coupling is disconnected prior to inspection — which reportedly takes a few minutes. Current production of Z-drives has centered on a series of five units rated at 440 kW (600 hp), including installations on ferries operating in eastern Canada.
Ulstein's largest demountable TCNP thruster, originally developed for powering large offshore service vessels, was recently supplied to an 8,000-gt seismic vessel, Ramform Explorer, and will also be featured on the vessel's sistership, currently under construction. Three TCNP units have also been supplied this year to the FPSO vessel building at Far East Levingston Shipbuilding in Singapore for Smedvig Offshore.
Ulstein Bergen has revised its 250-mm bore K series engines, offering reduced oil consumption, extended oil filter life, and improved valve train performance. The engines are leading auxiliary engines with the capability for burning heavy fuel oil.
Improvements to the engine family include the addition of a carbon cutting ring and other improvements to the cylinder unit, as well as hot box enclosed fuel injection equipment, and improved timing gear for extended life and higher injection pressures. For more information on Ulstein Circle 162 on Reader Service Card