Cummins extends tug and OSV references 1

A harbour tug recently completed at the Geumgang Shipbuilding yard in Korea for the domestic towage company Haeyang Shipping is powered by a pair of Cummins KTA50-M2 high speed main engines coupled to Schottel SRP 1012 azimuthing thrusters. A maximum speed of 13.5 knots and a service speed of 12 knots are yielded by the 2,650kW propulsion package.

Designed by Inchon-based naval architects Kumho Marine Engineering, the 33m-long x 8.7m-wide vessel will join a fleet of four tugs operated by the owner in ports on Korea’s rugged west coast, handling container ships, tankers and deep-draught coal carriers.

A slightly shorter near-sistership in the fleet, Haeyang No. 7, has been in service for six years with a similar Cummins package driving Schottel SRP 1010 propulsors, so far logging over 10,000 running hours without problems.

Memphis, USA-based Waxler Transportation has taken delivery of the last in a series of five 29.7m-long x 10.5m-wide pushboats, Helen Merrill undertaking a maiden voyage for Seacor’s inland transport subsidiary in January. The class was specified with twin Cummins KTA50-M2 engines rated at 1,180kW apiece. Electrical power requirements are satisfied by a pair of 99kW Cummins-Onan gensets.

Another in a series of 42m-long x 11m-wide anchor handling tugs has been handed over by the South China Shipyard in Guangdong Province. The Bureau Veritas-classed Kitty Fox II is powered by a pair of Cummins QSK60-M engines with a combined rating of 3,240kW.

A similar propulsion outfit serves the 26.5m-long Z-drive tug recently delivered by China’s Jiangsu Wuxi Shipyard to the Peruvian owner Trabajos Maritimos. Each engine develops 1,620kW at 1,800 rpm and is arranged to drive an HRP model 7111 WM (P3) azimuthing thruster via 6.681:1 reduction gearing. A pair of 100kW Cummins 6BT5.9DM-powered gensets provide electrical power, with a 38kW 4BT3.9DM-driven genset installed for harbour service.

Diesel-electric propulsion is increasingly favoured for offshore tonnage, a trend sustained by the 3,755 dwt diesel-electric platform supply vessel Stril Mariner, handed over last October to Stavanger-based Simon Mokster Rederi by the Norwegian yard Simek A/S. The 78.6m-long x17.6m-wide Havyard-designed PSV is classed by DNV.

Four Cummins KTA50-(D)M diesel-driven gensets form the 5,164kW power station, electrical power driving a pair of Ulstein Aquamaster US 205 CRP thrusters from Rolls-Royce and two bow thrusters.

Environmental friendliness is fostered by running only those number of gensets required to meet the given load, thus curbing emissions and enhancing fuel economy. In addition, the main engine exhaust lines incorporate selective catalytic reduction (SCR) systems to cut NOx emissions by around 90 per cent. A similarly-equipped sistership is due for delivery this spring. MP