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RAL-DESIGNED Z-DRIVE TUG FOR ITALIAN FLEET

Wednesday, April 8, 2020 

Rimorchiatori Riuniti Group of Genoa, Italy, has taken delivery of a modified version of the Robert Allan Ltd (RAL) TRAktor 2500-SX design, built in Turkey by Sanmar Shipyards.

Rimorchiatori Riuniti has several older Z-drive tractor tugs, but recent additions to its large fleet have been ASD and VWT type tugs. RAL believes that the addition of Italia, its TRAktor 2500-SX, could potentially signal a renewed interest in newbuild Z-drive tractor tugs for the Group. RAL and Sanmar worked closely with Rimorchiatori Riuniti to modify the design to suit the owner's requirements. Modifications included:

  • Rescue boat and davit on the foredeck
  • Fi-Fi 1 capability through independent pumpset
  • Recovered oil capability
  • Escort rating
  • Other minor modifications to outfitting and arrangement.

Despite having a low length to beam ratio (25.3m long and 12m wide), in order to accommodate high bollard pulls, the TRAktor 2500-SX is claimed to be efficient, highly controllable, and manoeuvrable, thanks to its modern hull form and appendage configuration resulting from RAL's investment in model testing and CFD optimisation.

The hull features a raised fo’c’sle deck for operation in rough weather and for keeping the lower accommodation space above the design waterline per the MLC code.

Italia has accommodation for a crew of six. The wheelhouse is designed with a single split control station for both ahead and astern operation offering visibility over the aft working deck. The engine room includes a separate switchboard compartment and engineer’s workshop. Main propulsion consists of a pair of Caterpillar 3516C diesel engines each rated 2,100kW at 1600 rpm driving Rolls Royce US 255 P30 fixed pitch azimuthing drives through straight line carbon fibre shafts. Two Caterpillar C 4.4 auxiliary gensets each have an output of 86ekW. Deck machinery features a DMT TW-E250KN frequency controlled electric drive, constant tension, towing winch with tension and length indication.

On trials, Italia recorded 70.2t bollard pull ahead and free running speed, ahead, of 12.4 knots.

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