AVT 36/70E new high-performance escort tug for Rimorchiatori Riuniti designed by Robert Allan Ltd.

May 19, 2006

Rimorchiatori Riuniti of Genoa, Italy have contracted with Robert Allan Ltd., Naval Architects of Vancouver, BC, to design a new offshore support and escort tug to add to their growing fleet of versatile tugs. This latest vessel, designated an AVT 36/70E tug by Robert Allan Ltd., will be constructed by Astilleros Armon in Navia, Spain.

The new tug, to be classed by RINA, will be suitable for a wide range of duties including harbour towage and ship-handling, coastal towing, salvage and escort operations. The tug is also equipped for fire-fighting and oil spill response duties.


Particulars of the AVT 36/70E Class, Voith propelled tug are as follows:


Length, overall
Beam, moulded
Depth, moulded
Maximum draft (overall)
Bollard pull
– 36.65 metres
– 13.60 metres
– 4.80 metres
– 4.00 metres
– 5,280 kW
– 70 tonnes minimum


The tank capacities are as follows:


Fuel oil
Reserve fuel oil
Potable water
Engine lube oil
VSP oil
Fi-Fi foam
Recovered oil
– 218 m³
– 130 m³
– 67 m³
– 10 m³
– 10 m³
– 15 m³
– 2 m³
– 130 m³


AVT 36/70E GA


Features of the new tug include a large aft deck to facilitate oil recovery operations, a removable escort tow bitt to ensure a clear deck during non-towing activities, and oil dispersant spray capabilities. There is also 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 general layout of the tug is illustrated in the General Arrangement drawing attached.

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 AVT 36/70E 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 gensets, 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 metres of 56 mm steel wire rope. The lower drum is a split configuration with a 250 metres 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-metre knuckle boom crane. Ship-handling 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 focsle deck sheer lines, and “W” block type fendering is used again at the bow.

The completed tug is scheduled for delivery in late 2007.

For more information on the AVT 36/70E Class tugs, or other high-performance terminal or escort tug designs, please contact us.