New Propulsion System Improves Uptime, Power

Thursday, August 16, 2001
The repower of Brother, a 140-ft. aluminum offshore crew/supply vessel with Cat 3508Bs, has reportedly improved efficiency more than 20 percent, and helped to decrease downtime significantly, according to Mike Dickinson, Eastern Division general manager for Graham Gulf Inc. of Bayou LaBatre, Ala. Graham Gulf currently operates five 140-ft. aluminum offshore crew and supply vessels in the Gulf of Mexico. All of the boats were designed and built by C&G Boat Works, a sister company of Graham Gulf, also located in Bayou LaBatre. Brother entered service in January 1998 powered by another manufacturer's 16-cylinder engines rated at 1,100 bhp. After more than two years of operation, Graham Gulf decided that the engines were not performing at the level required for the job. Two different engine models were considered for the repower. One manufacturer's engines were eliminated from consideration because they would have required extensive hull modifications, making it cost prohibitive. After discussions with local Cat Dealers and with corporate Caterpillar personnel, Graham specified four Cat 3508B engines rated 1,200 bhp at 1,800 rpm. ZF 2.33:1 marine gears replaced the previous 2.5:1 gears. Required changes during the repower included new water piping from the engines to the coolers, new engine controls and gauges, and new blowers to increase combustion and ventilation air flow through the engine room. Pipe diameter for the water-injected stern- discharge exhaust system was changed from 6 in. to 12 in. Low-end maneuvering was also a major concern coming into the repower, says Dickinson, because 60 percent of the vessel's operating hours are spent maintaining station while offloading supplies. "The Brother's original electronic engines required full throttle to maintain station, but the Cat 350Bs are doing the same job at quarter-throttle: When we put the engines in gear now, the boat moves. And there's less chance of damage to the vessel because the boat can do what we ask it to do," says Dickinson. While Graham Gulf considers improved vessel speed as secondary to improved handling capabilities, the speed increase is significant as well. Brother averages 5.5 hours per day at full-throttle transport speed, serving oil rigs located south of Dauphine Island, about 80 miles out from Bayou LaBatre.
Maritime Reporter July 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Contracts

Hapag-Lloyd Adds Halmstad to Rotation

As one of the top global carriers Hapag-Lloyd offers a comprehensive service network and will add port of Halmstad, Sweden to the Nordic Short Sea Network. As

BBC Chartering Opens Vietnam Office

BBC Chartering announces the opening of a new representative office in Ho Chi Minh City, Vietnam, starting August 1st breakbulk, and general cargo transportation

Fratelli Neri Orders Damen Tug

One of the largest Italian tug owners, Fratelli Neri S.p.A, ordered its first Damen tug, an ASD 3212, on 21 July 2015.   The vessel will be the first ASD tug

New Products

SSE Rolls Out Two Shipping Indices

Shanghai Shipping Exchange launched on Wednesday the "Belt and Road" shipping indices, tracking trade data and shipping freight rates under the initiatives of

INTERSCHALT VDR Earns CCS Certification

INTERSCHALT maritime systems AG, the provider of maritime software, services and systems for navigation and communications systems (NavCom) and manufacturer of Voyage Data Recorder (VDR) systems,

Coxreels Introduces Three-way Brake for 1600 Series

Hose, cord and cable reel manufacturer Coxreels announced the addition of an optional accessory to improve efficiency and safety of its 1600 Series reel, adding

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Standards Naval Architecture Port Authority Salvage Ship Electronics Ship Repair Shipbuilding / Vessel Construction Sonar
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1240 sec (8 req/sec)