The Seattle-based naval architecture and marine engineering subsidiary of Crowley Maritime Corporation is proud to announce that two of its tug designs have been selected among WorkBoat’s 10 Significant Boats of 2017.
Jensen’s design work, which yielded four constructed vessels – Earl W. Redd, Arkansas, Mardi Gras and South Carolina – will be recognized at the International WorkBoat Show on Thursday, 30 November, in New Orleans.
The first winning tug, Earl W. Redd, was designed for owner Harley Marine Services of Seattle, and built at Diversified Marine’s shipyard in Portland, Oregon.
Notably, it was the first tractor tug in America to enter service in compliance with the US Environmental Protection Agency (EPA)’s Tier IV environmental standards by use of a selective catalytic reduction (SCR) system.
The SCR system significantly reduces the amount of nitrous oxide (NOx), particulate matter and hydrocarbons released into the environment.
It is also equipped with a modern Rolls-Royce US 255-P30-FP Z-drive propulsion system and two Caterpillar 3516E diesel engines, for a rated 5,000 horsepower. Two 125kW John Deere generator sets provide the tug’s electrical power.
Following its christening in March, the tug joined Harley’s Olympic tug-and-barge operations along the US West Coast, including in Alaska, Puget Sound and on the Columbia River.
Jensen’s second winning design provided the blueprints for tugs Arkansas, Mardi Gras and South Carolina, which were built at Steiner Shipyard in Bayou La Batre, Alabama.
The 92-foot vessels each feature two modern Rolls Royce 255 Z-drive propulsion systems and two, low-maintenance G.E. 250 diesel engines, for a rated 2,748 horsepower. Two 99kW John Deere generator sets provide the tugs’ electrical power.
The trio of tugs feature improved steering by 30 percent and increased stability. Further, the tugs’ high horsepower and deep-draft are ideally suited for safety, long-term serviceability and the ever-increasing size, tonnage and draft of the ships calling at the ports served by Crescent Towing, which include New Orleans, Mobile and Savannah.
The workboats make up three of seven Jensen-designed tugs in the owner’s 18-vessel fleet.
