Harley Marine Welcomes First US EPA Tier 4 Tractor Tug

Photo: Harley Marine Services

Posted by Eric Haun

Harley Marine Services accepted delivery of its newest tractor
tug, Earl W Redd, a first-of-its-kind workboat equipped with
Caterpillar's Tier 4 emissions technology. The vessel enters the
Harley fleet as one of the most efficient and environmentally
conscious vessels in the world, exceeding the toughest marine EPA
standards.

Built at Diversified Marine of Portland, Ore., the Earl W Redd
measures 120 feet by 35 feet, with a loaded draft of 19 feet 3
inches. The tug features twin Cat 3516 Tier 4 Final main engines
that will each produce 2,675 horsepower at 1,600 rpm. Each of the
engines is paired with a selective catalytic reduction (SCR)
after treatment system. SCR uses a urea-based solution to reduce
NOx contained in diesel exhaust down to nitrogen and water vapor.
The main engines will be paired with Rolls Royce US 255-P30-FP
azimuth thrusters delivering an expected bollard pull capability
of 75 tons.

The Earl W Redd has a fuel capacity of 127,000 gallons and can
carry 6,534 gallons of water, 1,137 gallons of lube oil, 1,263
gallons of hydraulic oil and 8,200 gallons of diesel exhaust
urea. The vessel also features tow and bow winches by Markey and
fendering by Schuyler. The bow winch is specially designed for
ship handling and escort services. Auxiliary power comes from
John Deere 125kW generators.

The tug will enter service along the U.S. West Coast.

Feb 28, 2017

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