Some tugboats are built for long-distance ocean towing, while others are nimble and powerful enough to dock big ships. Harley Marine Services’ Earl W. Redd is the rare vessel that performs both jobs equally well.
Diversified Marine built the 5,350-hp z-drive vessel at its Portland, Ore., shipyard using a design from Jensen Maritime Consultants. Upon delivery in January, Earl W. Redd became the first U.S. tractor tug with EPA Tier 4 engines. It’s also the first using a selective catalytic reduction (SCR) system to meet tougher federal emissions rules.
Earl W. Redd has been assigned to Harley subsidiary Olympic Tug and Barge, and it is expected to work on the West Coast. Harley Marine’s Chief Operating Officer Matt Godden likened the versatile new tug to a Swiss army knife. “For us, it’s an exciting tool because it can go anywhere and pretty much do anything,” he said during an interview at the company’s Seattle headquarters.
“With the fuel capacity at almost 130,000 gallons, there aren’t a whole lot of places she can’t go and the combined bollard pull and horsepower is exceptional for this kind of activity,” Godden continued, noting the estimated 75-ton bollard pull rating.
Earl W. Redd is based on plans Jensen developed almost two decades ago. Over the years, the Seattle naval architecture firm has modified the design to accommodate higher and higher horsepower. This time around, the design evolved to accommodate heavier and slightly larger engines, SCR after treatment units and stainless steel urea holding tanks.
Jensen placed the roughly 100-cubic-foot side-mounted SCR units above each engine to save space. The units can be accessed from the fidley. Twin 4,000-gallon urea tanks are located in the center of the tug, aft of the mains. Ballast water tanks that formerly occupied those spaces are now located under the engine room.
この記事は Professional Mariner の American Tugboat Review 2017 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
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この記事は Professional Mariner の American Tugboat Review 2017 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
すでに購読者です? サインイン
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