PSI Announces Contracts For ACOE Dredges

Propulsion Systems, Inc., Kent, Wash., has been awarded a series of major contracts to furnish controllable-pitch propellers, bow thrusters, and rotary vane steering gear on the large and medium class dredges being built for the Army Corps of Engineers.

Both the large and medium class dredges being built at Avondale Shipyards and Sun Shipbuilding, respectively, will be equipped with P S I / L i a a e n E 105 fourbladed controllable-pitch propellers in nickel-aluminum-bronze.

The controllable-pitch propellers for the large dredge will be 12 feet 6 inches in diameter and capable of absorbing 5,200 bhp per shaft line at 170 rpm, while the 12-foot 6-inch-diameter propellers for the medium class dredge will be capable of absorbing 3,600 bhp per shaft line at 155 rpm.

Both controllable-pitch propeller systems will be furnished with micro-processor based electronic controls designed and manufactured by PSI.

In addition to the controllablepitch propellers, the large dredge will also be equipped with PSI/ Frydenbo HS 180 rotary vane steering gear with PE-type power units.

The steering gear is capable of developing 260,000 ft/lbs of torque per rudder at low operating pressures which provides safe and reliable operation of the steering system. Lock valves which are integral with each steering motor further enhance the system's safety and reliability in preventing fluid loss from the rotary actuator in the event of a burst pipeline.

The PSI/Brunvoll SPX-YP 600- hp controllable-pitch bow thruster will be supplied on the medium class dredge to aid in maneuverability. PSI has supplied over 300 Brunvoll thrusters in the U.S.A. Propulsion Systems, Inc. is the exclusive U.S. licensee for AM Liaaen Controllable Pitch Propellers and Frydenbo Rotary Vane Steering Gears, as well as the exclusive U.S. sales agent for Brunvoll Bow and Stern Thrusters.

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