Washburn & Doughty delivers Independent

Washburn & Doughty Associates, Inc.

delivered the 5,000 hp Z-Drive Tug Independent to Marine Towing of Tampa. The 92 x 32 x 13.7-ft. tug is designed for ship handling and built to ABS Class Maltese Cross Al. Maltese Cross AMS, with notation: Towing Service and Fire Fighting Capability.

Independent admeasures 148 gt and has a Load Line based on USA flag registry and USCG rules. Bollard pull is estimated at 135.000 lbs ahead and 130,000 lbs astern.

Independent is powered by High Displacement Caterpillar 3516 B main engines — rated at 2,500 blip @ 1,600 rpm — with electronic injection. The propulsion units are Rolls-Royce 1650H Z drives equipped with 2,400 mm stainless steel propellers and Kort nozzles with stainless steel liners. The vessel is equipped with two Caterpillar 3304 DIT marine package unit generators that provide 99KW @ 1,800 rpm, 208V 3 phase.

One generator is normally on line while the other is on standby. In event that the on line generator fails, the switchboard and generator automatically start the standby generator, put it on line, and shut down the other generator.

Fernstrum grid coolers are used to cool the main engines and fire pump engine.

The Z Drives are keel cooled by a welded channel cooler and the generators are cooled by circulating jacket water in the skeg void.

Independent is outfitted with Schuyler 16-in. laminated "soft loop" bow fender and a 12-in. black rubber "D" fender on the sides and stern. The vessel is equipped with two 1,500 gpm SKUM Fire Monitors, with water and AFFF no/./les with local pick up, and an Aurora model 411 centrifugal fire pump.

Power is provided by a Caterpillar 3406TA pump engine. Deck machinery consists of a Markey electric hawser winch and an Almon Johnson electric capstan aft. It is outfitted with a Siemens machinery alarm system, and all components are completely modular and plug into a single dedicated backbone.

Navigation and communications equipment include a Furuno GP-37 DGPS: a Simrad/Robertson AP9MK3 autopilot; a Simrad HS50 satellite compass; a Standard LH5 loud hailer; a Simrad RA53-4 radar; a Furuno 1953 C/NT radar; a Furuno depth sounder; and three Icom Ml27 VHF radios

Maritime Reporter Magazine, page 13,  Jun 2004

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First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.