Page 27: of Maritime Reporter Magazine (July 2005)

July 2006 27

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Document.

Ice Class Tugs Delivered by

Irving Shipbuilding

Nordane Shipping of

Svendborg, Denmark took delivery of the first of two

Ice Class 1A FS tugs from

Irving Shipbuilding Inc of

Canada in late January 2006. To ensure the low- est possible noise levels and to comply with the stringent Danish Maritime

Authority regulations, floating floors are fitted throughout together with double thickness joiner panels and extensive insu- lation in the engine room.

Two remote-controlled FiFi monitors supplied by FFS capable of a discharge rate of 1,200 m3/h each are fitted just aft and above the wheelhouse. The monitors are supplied by a dedicated pump of 2,700 m3/h capacity, driven off the front end of the port main engine. A water curtain of 300m3/hr is also supplied by the pump, or alternatively foam can also be supplied at 300 cu. m./hr.

Below the waterline, the tug is fitted with a large "escort" keel forward to provide effective indirect towing capability and enhance course keeping, especially when running astern. The forward end of the skeg has been fitted with an icestop, designed to prevent the hull riding-up onto the ice. T he aft end is fitted with two iceknives to divert large pieces away from the propellers.

Stevns Iceflower is the third iceclass vessel delivered by Irving Shipbuilding Inc since September 2005. Measuring 30.8m x 11.14m, the LR-classed Stevns

Iceflower is powered by a pair of Caterpillar 3516BHD diesels, devel- oping 2,500hp each at 1,600 rpm. Heavy duty 2.4m diameter control- lable pitch US255 Z drives were supplied by Rolls-

Royce Aquamaster.

Trials results were even better than the builder had anticipated. A speed of 14 knots was achieved, together with a maximum bollard pull of 60.4 tons ahead, 56.9 astern.

To provide extra flexibility to help secure niche charters, a Kamewa 45TV bow thruster of 150kW is also fitted. A uxiliary power is provided by two Caterpillar C9 gensets developing 165kW each. F or towing and anchor-handling operations, a set of 200mm towpins is installed in conjunction with a 150 tonne Ridderinkhof aft towing winch, Ridderinkhof tugger winch/capstan, a 75 tonne Washington Chain tow-hook and a stern roller. The frequency-controlled aft winch is a single drum type (complete with spooling gear) capable of storing 762m of 51mm wire.

The 150 ton Ridderinkhof electric line handling winch on the raised foredeck is capable of storing 400 ft. of 3.25-in. Spectra line. This winch is also fitted with heavy duty spooling gear. Comfortable accommodation for six is provided (all in single cabins). The Captain and Chief Engineer's cabins are located on the main deck, the remainder on the lower deck.

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