four stroke engines
One of a pair of Damen-built product tankers with MaK M25C main engines
››› with Quebec City-based Ocean Groupe from the group’s own Ocean Industries yard. The 6,000kW ASD tug Ocean Tundra is the latest example of Vancouver naval architect Robert Allan’s TundRA 100 class icebreaking tug, which has a nominal bollard pull of 100 tonnes.
A range of duties can be handled by the 36m-long x 13m-wide vessel. These include tasks such as tanker escort, terminal support, general shipdocking and icebreaking/ice management in ports along the St Lawrence River. Coastal and rescue towage along with firefighting can also be undertaken. A free-running speed of 15.13 knots, a bollard pull (ahead) of 110.3 tonnes, an escort steering force (predicted) of 122 tonnes at 10 knots and a range of 3,700 nautical miles at 12 knots are provided by an MaK-powered Z-drive azimuthing thruster propulsion plant. Twin nine-cylinder M25C medium speed engines, each developing 3,000kW at 750 rpm, are installed to drive Rolls-Royce US 305 thrusters equipped with 3m-diameter CP propellers.
Electrical power is supplied by three gensets, each driven by a 250kW Caterpillar C9 high speed diesel engine. The main and auxiliary engines are resiliently mounted to maximise noise and vibration isolation.
Quadruple-Cummins outfits drive large FSVs Offshore tonnage continues to provide valuable business for Cummins propulsion and genset engines. A longstanding US-based customer, Seacor Marine, specialises in fast support vessels (FSVs) ranging in length from around 40m to 60m, with speeds between 25 knots and 35 knots. Among the operator’s latest acquisitions is the first of two 54m-long FSVs from the Neuville Boat Works in Louisiana, offering a cargo capacity of 196 tonnes on 234m2 of clear deck space and seating for up to 83 passengers. Tankage is arranged for potable water, drill/fresh water and fuel oil. Propulsive power for the ABS-classed vessels is provided by four Cummins QSK50-M engines, each developing 1,325kW at 1,800 rpm and driving a Hamilton HT811 waterjet via a Twin Disc gearbox with a reduction ratio of 2.58:1. Speeds of 30 knots (at 50 dwt), 25 knots (130 dwt) and 21 knots (180 dwt) are promised by the quadruple-jet installation. Electrical power is supplied by a pair of 290kW Cummins QSM11-driven gensets. Twin Cummins K38M engines,
which are EPA Tier 2-compliant and have a combined rating of 1,470kW, achieve a speed of 13 knots for the 51m-long supply
24 I Marine Propulsion I April/May 2014
vessel Mr Ernie, recently completed by another Louisiana yard, New Generation Marine Shipbuilding. Each engine drives a Bird Johnson four-bladed propeller through Twin Disc MGX-5321 gearing. Electrical demands are met by two 300kW Cummins QSM11-driven gensets, while another QSM11 engine powers the Brunvoll bow thruster.
Deliveries from the New Generation yard on the Intracoastal Waterway near Houma last year included the 21.6m-long x 9m-wide pushboat Gunner. A pair of grid- cooled Cummins KTA38-M engines (an industry standard for pushboats of this size) each yield 735kW at 1,800 rpm, driving Kahlenberge propellers via Twin Disc 5321 gearboxes with reduction ratios of 6.394:1. Triple-screw propulsion plant was specified for ten 42m-long crewboats building at the Vietnam yard of Australia- based Strategic Marine for Brunei’s PTAS Marine. The series was headed by PTAS MV One and will be completed in June by PTAS MV Tide.
Designed by Incat Crowther in conjunction with Strategic Marine and based on an established 40m aluminium crewboat model, the larger vessels feature
a steel hull and aluminium superstructure. Space is arranged for 12 crew, 30 rig workers and 100 survivors of an emergency; up to 10 tonnes of cargo can be carried on a clear deck area of the Lloyd’s Register-classed design. A central Cummins KTA50-M2 engine delivering 1,325kW at 1,900 rpm is flanked port and starboard by KTA38-M2 engines, each rated at 990kW at 1,900 rpm. A total of 3,310kW is transmitted by the engines (all IMO Tier II-compliant) to three fixed pitch propellers via Twin Disc reduction gearsets, driving the vessel at 20 knots (at 85 per cent maximum continuous rating and 40 dwt).
Electrical power is generated by two 80kW Cummins 6BT5.9 diesel-driven sets; a 312kW Cummins QSJ11-D(M) engine serves each vessel’s twin bow thrusters. A 1,400m3 LPG carrier recently completed by Saigon Shipbuilding & Marine Industries One Member Co features twin 294kW Cummins 855 propulsion engines and a pair of 120kW gensets driven by Cummins 6C engines. Designed for coastal and river trading, the 60m-long x 11m-wide vessel carries cargo in two tanks. MP
www.mpropulsion.com
Canada’s most powerful tug was launched with additional flotation from inflatable bags
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