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RAL DESIGN LNG TERMINAL TUG DELIVERED TO MALTA

Tuesday, May 28, 2019 

'Vittoriosa', the first RAstar 3000-W Class LNG terminal escort tug has been delivered to Tug Malta, a wholly owned subsidiary of the Italian Rimorchiatori Riuniti Group, from Turkish builder Med Marine Shipyards.

The Robert Allan Ltd (RAL) RAstar series are LNG terminal escort/support tugs in operation at major LNG facilities worldwide, a high-performance ASD tug design with a sponsoned hull form proven to provide significantly enhanced escort towing and seakeeping performance. Roll motions and accelerations are less than half those of comparable sized 'standard' tug hulls.

The 29.7m long RAstar 3000-W design for Tug Malta has various features for LNG terminal support. The bow fendering system is designed for a low contact pressure requirement of 20t/m². A gas detection system is fitted to warn the crew of a potential hazardous atmosphere. Ventilation dampers can be remotely closed. All essential electrical equipment on deck is certified safe and type suitable for use in a Zone 2 LNG environment and all non-essential electrical equipment can be electrically isolated. Fi-Fi 1 capability with water spray is provided along with a large capacity of fire-fighting foam.

The RAstar 3000-W is designed with a low profile for operation under the flare of assisted ships. The wheelhouse provides 360-degree visibility from the operator’s position with sight lines to the fore and aft working decks. Tug Malta elected to use a Rolls-Royce double drum winch with dual aperture escort staple on the fore deck and a towing hook on the aft deck with the option for future installation of an aft towing winch.

The Vittoriosa was designed and constructed to RINA rules with notation: RINA C ✠ HULL ✠ MACH; ESCORT TUG; FIRE FIGHTING SHIP 1; WATER SPRAYING; UNRESTRICTED NAVIGATION; AUT-UMS; AUT-PORT; COMF- NOISE C; COMF-VIB C; INWATERSURVEY

Main propulsion comprises a pair of box cooled MTU 16V4000M65L diesel engines, each rated at 2,560 kW at 1800 rpm, driving - through a carbon fibre floating shaft system - a Rolls Royce US 255 P30 FP fixed pitch Z-drive unit with HD slipping clutches on the drive units. Two identical diesel gensets each with a power output of 99kWe provide electrical power.

On trials, the Vittoriosa demonstrated nearly equal ahead and astern performance, with bollard pull 81.5 tonnes ahead, 81 tonnes astern, and free running speed 13.8 knots ahead, 13.7 knots astern.

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