Robert Allan Ltd Marvelous Tug Designs


Embark on an awe-inspiring journey as we unveil the cutting-edge RAmparts 3500 tugs, redefining the maritime landscape with their unrivaled power and versatility. The maritimeinformed news source.

  • Robert Allan Ltd. delivers RAmparts 3500 tugs Cao Gang 30 and Cao Gang 31 to Caofeidian Port, China, meeting challenging design requirements for towing and fire-fighting purposes in Bohai Bay.
  • The tugs feature advanced propulsion machinery, including Yanmar main engines and Schottel Z-drive, and offer comfortable accommodations for a ten-member crew.
  • Impressive sea trial results demonstrate high bollard pull (81.5 tones) and free-running speed (13.1 knots), making the owner highly satisfied with the tugs’ performance.

Challenging Design 

The design process for these tugs was challenging, considering the required vessel length of 34.8 metres, bollard pull of 80 tonnes, and a gross tonnage limit of 500. The development of the hull form and arrangement, along with other essential features like single cabins for 10 crew members and a Fi-Fi 1 Class fire-fighting system, demanded substantial effort. However, the results were well worth it.

Key Particulars

The Cao Gang 30 and Cao Gang 31 tugs have an overall length of 34.7 meters, a molded beam of 11.1 meters, and a least molded depth of 5.19 meters. Their maximum navigational draft is 4.94 meters, and they have a gross tonnage below 500. The main tank capacities include 85 m3 of fuel oil, 30 m3 of potable water, 110 m3 of ballast, and 10 m3 of fire-fighting foam. During sea trials, the tugs showcased their outstanding performance, achieving a bollard pull of 81.5 tones and a free-running speed of 13.1 knots.

Advanced Machinery

The tugs are equipped with two powerful Yanmar main engines of 8EY26W, each generating 2390 kW at 750 rpm, and a pair of Schottel Z-drive SRP 460FP, Ø2700, FP. The deck machinery, including hawser winches and towing winches, is provided by Karmøy Winch AS, Norway. The fenders for ship-handling comprise an upper row of cylindrical fenders and a lower course of W-fenders at the bow, and “D” rubbers and W-fenders at the stern.

Comfortable Accommodations

The tugs have been designed to accommodate a crew of ten, with cabins for the master and chief engineer, a mess, and a galley in the deckhouse, along with eight other crew cabins located on the lower accommodation deck. The wheelhouse has a split-type control station, offering maximum all-round visibility for safe and efficient operations.

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