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Norwegian company Herøyhav AS has taken delivery of a 69.95-metre trawler/purse seiner from Karstensens Shipyard, Denmark. The vessel is hallmarked by its flexible propulsion package that offers a number of fuel-saving power modes to accommodate the different fishing patterns it will encounter at sea.

The Herøyhav [pictured] was ordered by the Ervik family of Fosnavåg, Norway in January 2012 and replaces a previous vessel of the same name from 1999. The new fishing vessel has been updated with modern equipment that provides flexible and economic operation, both for pelagic trawling and purse-seine fishing in the Atlantic adjacent to Norway’s coast.

The propulsion package consists of a MAN 9L27/38 engine and a two-speed reduction gear that drives a MAN Alpha 4,200 mm diameter ducted propeller. The propeller nozzle is a customised MAN Alpha AHT design. MAN Diesel & Turbo also supplied its Alphatronic 2000 propulsion control system, including the ECO Speed Pilot for optimal voyage planning and speed setting.

Hybrid flexibility

A hybrid configuration is a fuel-efficient and flexible power-and-propulsion system with high redundancy. Hybrid propulsion systems are a combination of electric propulsion and diesel drive, and enable ships with variable power requirements to run at high propeller efficiency. A large number of operational modes are available, which enable the engine and propeller to run optimally over a wider power range.

The Herøyhav's propulsion system has several power modes: both diesel-mechanical, diesel-electrical and hybrid combinations. Its auxiliary generators can deliver 1,500 kW auxiliary power to the hybrid system, which – in combination with the main-engine power of 3,285 kW – offer a total propulsion output of 4,785 kW (~ 6,500 hp) for trawling or full-speed steaming.

The following ship speed / power modes were verified during sea trials:
• 11.6 knots – 1,400 kW (diesel-electric, variable propeller speed)
• 14.0 knots – 2,400 kW (diesel-electric, fixed propeller speed)
• 15.5 knots – 3,285 kW (diesel-mechanical)
• 16.6 Knots – 4,785 kW (diesel-mechanical + electric boost)

Environment – no oil to water

As a result of the fuel-saving propulsion setups for the various operational modes, the Herøyhav also limits exhaust gas-to-air emissions. Another eco-friendly feature is its coated propeller shaft, installed in combination with a water-lubricated stern-tube system, that eliminates any risk of sealing damage and any leakages of stern-tube oil to the sea in the event of impact with fishing gear wires.

Image: Herøyhav fishing vessel.