New Caribbean tug works forward and aft.
For its size, the vessel has significant diesel power installed onboard relying on four diesel engines for main propulsion, electrical generation and to drive the fire pump and hydraulic system.
The propulsion system includes a pair of Caterpillar C18 diesels rated 714 hp each at 2100 rpm. Each engine is fitted with a Reintjes reduction gear with 5 in. shafts transmitting power to 53.28 in. x 59 in. propellers in 53.9 in. kerr nozzles.
Other engines include two John Deere diesels, one driving a 50 kW Newage generator for vessel power and the second drives the hydraulics and the fire monitor pump.
A Wesmar bow thruster is fitted on the vessel, powered by a hydraulic pump via a PTO off the generator engine.
The firefighting setup on the Sand Cay features a Desmi fire monitor pump connected to a Twin Disc PTO driven by the John Deere engine. The fire pump serves two Stang monitors mounted on top of the pilothouse.
All engines and the air conditioning system are keel cooled using Fernstrum grid coolers.
Like many vessels built for the Caribbean, the Sand Caywill be called on to perform a variety of tasks in Georgetown Harbor. Towing, line hauling, ship assist in docking and undocking maneuvers, and firefighting to name just a few. The vessel can also engage in limited cargo hauling on her flat main deck, although the vessel is not designed for that task.
The vessel is extremely versatile from the single push knee at the bow, to the A-frame for the towing winch aft. A bulwark is placed around the main deck with an open stern. The superstructure is placed well inboard and forward, maximizing space for the large work deck. A double pole cruciform type towing bitt with towing hook is amidships on the center aft deck.
One of the main jobs of this vessel is to offer towing assistance to other ships. The towing winch is a single-drum single-capstan unit by ESI with a 24 in. x 8.9 in. winch drum driven by two Oil Gear hydraulic pumps that are in turn connected to a Technodrive PTO driven by one of the John Deere engines.
The towing wire fits over an aft-mounted A-frame that is lowered and raised by two hydraulic cylinders powered by the hydraulic pump mounted on the front of the generator.
The A-frame is constructed of 8 in. steel pipe with 1 in. steel pad eyes, 3 in: stainless-steel pins mounted on a 1.7 in. steel doubler continuously welded to the main deck. The transom is fitted with a 15.9 in. x 1.68 in. roller for paying out and retrieving the towing cable.
The Sand Cay is very well equipped in the pilothouse with a Simrad radar/echo sounder, a Simrad GPS, Simrad autopilot, Simrad Satellite Compass and two Simrad VHF radios. Also onboard is an Iridium satellite communications system and a remote display.
Not only is the pilot house well equipped with the latest electronics, the layout offers an unobstructed view in all directions. The wheel house is designed to prevent damage to other vessels when coming in alongside. Steering is electrohydraulic using two sets of jog levers. There is an emergency steering station located at the access to the lazarette with a 21.9 in. stainless wheel with a Tastrum rudder angle indicator.
The Sand Cay is registered under the U.S. flag and built to ABS class meeting all U.S. Coast Guard construction rules and regulations. The vessel was officially christened in Georgetown in September 2005.
Larry Pearson is an independent journalist based in Metaire, La.
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|Publication:||Diesel Progress North American Edition|
|Date:||Jun 1, 2006|
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