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Marine Log

AVT 36/70 E

September 9, 2007

Genoa operator orders new offshore/escort tug design

Rimorchiatori Riuniti of Genoa, Italy has contracted with Robert Allan Ltd., Naval Architects of Vancouver, B.C., to design a new offshore support and escort tug to add to its growing fleet of versatile tugs.

This latest vessel, designated an AVT 36/70 E tug by Robert Allan Ltd., will be the second of a pair of almost identical Voith propelled tugs to be constructed by Astilleros Armon in Navia, Spain.

Both tugs, to be classed by RINA, will be suitable for a wide range of duties including harbor towage and ship-handling, coastal towing, salvage and escort operations, firefighting and oil spill respons.

The second vessel is also equipped for heavy duty anchor-handling.

Particulars of the AVT 36/70E Class tugs are:
Length Overall 36.65 m
Beam, Molded 13.60 m
Depth, Molded 4.80 m
Maximum Draft (overall) 4.0 m
Power 5,280 kW
Bollard Pull 70 tonnes minimum

Tank capacities are:
Fuel Oil 218 cubic m
Reserve Fuel Oil 130 cubic m
Potable Water 67 cubic m
Engine Lube Oil 10 cubic m
VSP Oil 10 cubic m
Fi-Fi Foam 15 cubic m
Dispersant 2 cubic m
Recovered Oil 130 cubic m

Features of the first tug, now nearing completion, include a large aft deck to facilitate oil recovery operations, a removable escort towbitt to ensure a clear deck during non-towing activities, and oil dispersant spray capabilities.

The second tug will have slightly different stern lines to incorporate a 3 m long stern roller, and a set of shark-jaws. The design features a full raised forecastle running nearly half the length of the tug to provide a high standard of accommodation and the best possible sea-keeping capability for operation in exposed conditions.

The vessel will be outfitted to the highest standards for a crew of up to 14 people. Main deck accommodations include three two-person cabins, four one-person cabins, a galley, mess, galley stores, workshop, oil lab, locker room/lobby, and deck store. The deckhouse at forecastle deck level includes four one-person officer cabins.

The wheelhouse is designed for maximum visibility with a single control station providing maximum visibility to both fore and aft deck working areas, with the emphasis on the aft deck. The lower deck includes engineer's stores, and laundry facilities. All cabins are of a generous size, and boast en-suite lavatory facilities. The noise level throughout the crew accommodation is predicted to be in the range of 60 dBA, based on utilizing advanced methods of isolating main propulsion machinery, as well as high grade insulations and floating floor techniques.

Main Propulsion for the AVT36/70E comprises a pair of MaK 8M25 diesel engines, each rated 2,640 kW at 750 rpm, and each driving a Voith model 32R5-265-2 cycloidal propeller in tractor configuration.

This combination is predicted to deliver a Bollard Pull of 70 tonnes, and provide a free running speed of not less than 13.5 knots. The indirect escort steering force is estimated at 110 tonnes at 10 knots.

The operating range at economical cruising speed is estimated at 3,500 nautical miles (minimum).

The electrical plant is comprised of three identical diesel gen-sets, each with a 380 volt/50 Hz power output of 125 kW.

Fire-fighting will be to a Fi-Fi 1 Class.

The main towing winch is a waterfall-style, double drum type, in which the upper drum contains 1,000 m of 56 mm steel wire rope. The lower drum is a split configuration with a 250 m synthetic hawser for escorting, and a 150-metre synthetic line for harbour towing. The anchor windlass, in a horizontal axis configuration is fitted with two chain wildcats and two warping heads, which are clutched separately.

Towing flexibility is enhanced by the inclusion of a 70-tonne, radial arm tow hook, while salvage and general stores/deck operations are aided by inclusion of a 25-tonne-meter knuckle boom crane. Shiphandling fenders at the stern (skeg end) comprise a 900 x 450 cylindrical fender above a row of 450 mm "W" block fenders. A 300 x 300 hollow "D" fender provides protection at the main and foc'sle deck sheer lines, and "W" block type fendering is used again at the bow.

The first tug is scheduled for delivery in late 2007. The second vessel will follow approximately one year later.