SEACOR Marine services the offshore oil and gas industry with a worldwide fleet of 191 vessels. Even within the same vessel category, say fast supply vessels, horsepower ratings vary as well as deck space and passenger capacity.
“SEACOR has always had a strategy where it’s not one-size-fits-all,” said the company’s Joe McCall.
Instead of building most of its boats to the same design, SEACOR emphasizes a diversified fleet. The most recent example of that is the company’s plans for four new 202’×34’×13′ DP-2 fast supply vessels. “The vessels will be in the middle range of cargo carrying, number of passengers and speed. They will be a good all-around vessel,” said McCall. “They give us new vessels in the fleet. We don’t want the fleet to age.”
Four Cummins QSK60 engines rated at 2,700-hp each will power the FSVs. Hooked up to Twin Disc MGX-61500 marine gears with a ratio of 2.56:1, the Cummins diesels will spin HamiltonJet HT810 waterjets.
In light conditions, the FSVs should hit 32 knots. With the 3,615-sq.-ft. cargo deck loaded to a maximum 400 long tons and with 64 passengers in reclining seats on the main deck, speed should be about 20 knots.
It’s possible two of the fast suppliers will offer a comfort advantage for its passengers on the ride out to an offshore platform. That’s because two of the boats are being outfitted with Naiad Dynamics ride-control systems, which employ underwater fins activated by a stabilizer control system to counteract a boat’s rolling motion. Two boats will not have the system. “We want to evaluate this class of vessels with and without the system,” said McCall.
For maneuvering in tight places and dynamic positioning, the boats will have three Thrustmaster 200-hp electrically driven bowthrusters. Power for all electrical needs will come from three 290-kW generators, each powered by a Cummins QSM11 diesel engine. If a boat has to deal with a fire, it will be able to rely on two remote-control monitors, each putting out 5,300 gpm. One of the monitors will have foam capability.
McCall said the boats “will operate globally. They could be operating anywhere in the world.”
Two of the boats are being built at C&G Boat Works in Mobile, Ala., and two are under construction at Gulf Craft in Franklin, La. C&G is scheduled to launch the first new boat in July 2013 and the second in October 2013.
Gulf Craft should deliver its first boat in November 2013 and the second in April 2014. Gulf Craft, working with Incat Crowther, designed the boats.