Washburn and Doughty signs tug contract with Moran

On January 5, 2009, Washburn & Doughty Associates, Inc. signed a contract with the Moran Towing Corporation to build one 121′ x 36′ x 18′ Intercon Tug (Hull 98).

Designed by Ocean Tug & Barge Engineering Corp., Hull 98 will be the fourth vessel built by Washburn & Doughty to this design. Pati R. Moran and Linda Moran are already in service and Lois Ann L. Moran is scheduled for delivery in the 3rd Qtr. 2009.

The vessel is being surveyed by the American Bureau of Shipping and will be Classed X A1 Towing Service and X AMS, with an international load line.  The vessel will comply with all applicable SOLAS regulations.

Hull 98 will feature an Intercon C series coupler outfitted with 34•bCrLf diameter rams; hydraulic tensioning; port and starboard hydraulic power units; motor control center; logic/control panel; and two touch screen station remote controls.

The vessel will be powered by two EMD 12-710G7C-T2 main engines each rated at 2550HP @800RPM and outfitted with Lufkin model RHS2500HG reverse reduction gears.  Nominal gear ratio is 4:1. 

Specifications call for ABS grade 2 steel shafts 10•bCrLf in diameter, and Rolls Royce New Generation Workwheel, 5-blade, 115•bCrLf diameter, stainless steel propellers.
Plans call for the tug to be outfitted with an EMI electro-hydraulic steering system designed to interface with the gyrocompass and autopilot.

The electrical system will be 480 VAC, 3-phase, 4-wire, designed for non-paralleling operation. The two ship service generators shall be John Deere Tier 2 emissions certified 1800-rpm marine engines with Marathon generators each providing 125 KW, 480VAC, 3-phase power.

The main switchboard, manufactured by Industrial Power Systems, will be located in the engine room and fitted with a 480 V 3 phase distribution section. It will be non-paralleling with a split bus.

The emergency generator shall be a keel cooled John Deere Tier 2 emissions certified 1800-rpm diesel engine with a Marathon generator providing 65 kW.  It shall be supplied with a 24V starter, 24V controls and block heater. It shall be arranged to automatically start (electric start) upon loss of the ship service generators.

The emergency switchboard, also manufactured by Industrial Power Systems, will automatically sense loss of power from the main switchboard and will automatically start the emergency generator and transfer energy loads.

Markey capstans will be located on the fore and aft decks. A CEWP-90, 27•bCrLf diameter, 40 hp electric capstan will be located aft.  It will have a rated pull of about 60,000 lbs at 40 ft/minute and be capable of withstanding 300,000 lb static pull. A CEW-60, 15 hp electric capstan will be located forward. It will have a rated pull of about 30,000 lbs at 30 ft / min. 

The electronics package is being developed consistent with SOLAS requirements. It is anticipated that the following will be installed: 5 VHF radios (w/ antennas); Loud hailer (w/ 6 talk back speakers); 2 Radars (w/ 2 – 6.5′ antennas); Depth sounder (w/ transducer); 2 GPS (w/ antennas); GMDSS system (includes SSB radio, TELEX, FAX 5, and VHF radio with applicable antennas); Wind speed indicator; Nav Tex (w/ antenna); Boat Tracs (w/ antenna); Speed Log (w/ transducer); SSAS (w/ antenna); AIS (w/ antenna); Auto pilot; and Gyro Compass (w/ repeater).
Accommodations will be provided for 12 crew members.

By Professional Mariner Staff