The Svitzer Hermod and Svitzer Chirripo are the first two of six customized Robert Allan Ltd. RAstar 2800 class terminal support/escort tug designs under construction at Turkey's Sanmar shipyard for Svitzer's "Silver Bullet" fleet replenishment program.
Svitzer Chirripo will be the 150th tug that Sanmar Shipyards has built to a design by Robert Allan Ltd. Cooperation between the two companies began in 1995, with a series of 18 m tugs designed and built for Sanmar's own fleet. The collaboration has since grown to include several classes of tugs, from the high performance RAstar escort tugs, through the workhorse RAmparts class, to the innovative VectRA VSP tug design.
The two new Svitzer vessels have been fully customized to suit the client's very specific operational requirements, and have been classed to ABS, ✠A1, TOWING VESSEL, Fi-Fi 1, ✠ AMS,✠ ABCU, UNRESTRICTED, UWILD
Particulars of the tugs are:
Length overall: 28.2 m
Beam, molded, extreme: 12.6 m
Depth, molded (hull): 5.3 m
Maximum draft: 4.12 m
Major tank capacities are:
Fuel oil: 112 cu m
Potable Water: 14 cu m
Foam: 4 cu m
On trials, the tugs met or exceeded all performance expectations, with the following results:
Bollard Pull, ahead: 70+ tonnes
Free running speed, ahead: 13.5 knots
The vessels have been arranged and outfitted to a high standard with eight crew berths in total. The officer's cabins are located on the main deck and three private double crew cabins are located on the lower accommodations deck. A fully appointed mess/lounge and a modern fully-equipped galley are also located on the main deck.
The tugs are designed to provide ship handling and ship assist work performed over the bow utilizing a hawser winch and staple. Towing operations are performed off the aft deck using a quick release towing hook / tow post.
The wheelhouse is designed for maximum all-round visibility with a forward control station providing maximum visibility to both fore and aft deck working areas.
Main propulsion for each tug comprises a pair of MTU 16V4000 M63 diesel engines, each rated 2,000 kW at 1,800 rpm, and each driving a Schottel, SRP 460 (ex. SRP 1515) fixed pitch Z-drive unit with 0-idle slipping clutch, in ASD configuration.
The electrical plant comprises two identical diesel gen-sets, each with a power output of 100 ekW.
Ship-handling fenders at the bow consist of one row of cylindrical fender at the main deck level, 800 mm OD x 400 mm ID. A 300 mm thick "W" block fender is arranged below the cylindrical fender. Two strakes of 300 x 300 hollow "D" fender provides protection at the main and forecastle deck sheer lines, and a 300 mm thick W-fender is used at the stern.