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First US-built Rotortug now in service with Seabulk Towing

Feb 10, 2017 04:16 PM

Trident from Robert Allan and Master Boat Builders features three z-drives

Courtesy Robert Allan Ltd.

The following is the text of a news release from Robert Allan Ltd.:

(VANCOUVER, British Columbia) — The first U.S.-built Rotortug, ART Trident, has undergone trials and is now in service. Designed by Robert Allan Ltd. and designated as an ART 80-98US, it was built by Master Boat Builders in Bayou La Batre, Ala., and is the first in a series of three being constructed for Seabulk Towing of Fort Lauderdale, Fla.

The ART (Advanced Rotortug) designation applies to Robert Allan Ltd. designed tugs featuring the unique triple z-drive configuration, originally conceived and developed by Rotortug (KST) B.V. of the Netherlands. Offering exceptional omni-directional maneuvrability and control, with a redundant propulsion machinery configuration, the ART series offers enhanced performance for ship-handling, terminal support and escort towing.

Particulars of the ART 80-98 tug are as follows:

Length overall: 98’-6”
Beam, molded, extreme: 43’-6”
Depth, molded (hull): 15’-7”
Maximum draft: 18’-9”

Tank capacities at 100 percent are as follows:

Fuel oil: 52,000 U.S. gallons
Potable water: 5,000 U.S. gallons
Foam: 4,200 U.S. gallons

On trials, Trident met or exceeded all performance expectations, with the following results:

Average bollard pull, ahead: 78 tons
Free running speed, ahead: 12.5 knots

The vessel has been arranged and outfitted to a high standard with six crew berths. The master’s and chief engineer’s cabins are located in the deckhouse with two double crew cabins located on the lower accommodation deck. A fully appointed mess/lounge and a modern, fully equipped galley are also located in the deckhouse.

The deck machinery consists of a JonRie Series 230 ship-assist hawser winch forward, and a JonRie Series 500 combination towing/hawser winch on the aft deck. The tug is equipped to perform escort operations over both the bow and stern, and is also equipped for long line towing over the stern. The wheelhouse is designed for maximum all-round visibility with a forward control station providing maximum visibility to both fore and aft deck working areas and featuring an Alphatron integrated bridge system.

Main propulsion comprises three Caterpillar 3512C diesel engines, each rated 1,911 bhp at 1,600 rpm, and each driving a Schottel SRP 1012 fixed-pitch z-drive unit.

The electrical plant consists of two identical diesel gensets, each with a power output of 150 kW.

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