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Propulsion solutions for offshore patrol vessels - 4 Pages

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Catalogue excerpts

PROPULSION SOLUTIONS FOR OFFSHORE PATROL VESSELS Comandante Toro, Chilean Navy Coast Guard. Courtesy of Chilean Navy. With increasing numbers of countries turning to Offshore Patrol Vessels (OPVs) for their coastal defence and policing, they are becoming a strategic feature in most nation's naval fleets. But as these modern vessels perform an array of non-military functions, including fisheries, environmental and Exclusive Economic Zone (EEZ) protection and law enforcement, as well as playing a key role in public relations, their propulsion systems have to suit the varying loads that are required in such a diverse operational envelope. Because of this, no two OPV designs are the same, although they are usually between 500 t and 3300 t displ. with a speed of up to 25 knots and a limited weapons and communications fit. WÄRTSILÄ SOLUTIONS ENHANCED TO FIT AN EVOLVING OPV MARKET Wärtsilä has a long track record in delivering equipment for OPVs. But like other ship systems, propulsion systems do vary a great deal from design to design. A medium speed engine is found to ideally suit this rugged application and for the Danubio IV OPV (shown below) the 12-cylinder Wärtsilä 26 in V-configuration delivers 4080kW per shaftline. The Wartsila 26 is a robust engine which has been specifically designed to achieve 24,000 running hours before a top overhaul is scheduled and all engine servicing can be carried out in-situ. Wärtsilä has combined this engine with its in-house range of gearboxes and controllable pitch propellers (CPP), available in both 4 and 5 bladed configuration, to provide optimum operation in terms of performance, reliability and maintenance. This configuration is favoured by the Chilean Navy Coast Guard who give the integrated nature of the control system coupled with the cost of ownership as key reasons for selecting the Wärtsilä package.

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A similar solution has also been taken up by the Portuguese Navy but with the addition of a small loiter drive of around 250kW for continuous operation at less than 6 knots. The Wärtsilä 26 range offers 340kW per cylinder extending to the 16-cylinder Wärtsilä 26, V-engine at 5440 kW maximum continuous rating. When larger engine powers are required and the power-to-weight ratio demands high speed engines, Wärtsilä can offer CPPs and gearboxes to suit such applications. OPVs with 18,000kW propulsion power are driven by Wärtsilä CPPs. The versatility of the Wärtsilä propeller range is well suited...

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ENGINES – GENERATING SETS The guiding principles behind the design of Wärtsilä engines and generating sets are: • Reliability and low maintenance costs • High thermal efficiency and low emissions • Modular construction and reduced parts count • Ergonomic interfaces • Minimised consumables • Cylinder liner with Anti Polishing Ring • Extended time between overhauls (up to 24,000 hours between top overhauls) • Common Rail Technology • Emission compliant with IMO Tier II requirements SEALS & BEARINGS • Design simplicity provides maximum sealing system security • Leakage virtually eliminated and easily...

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COMANDANTI class, Italian Navy. BARENTSHAV class, Norwegian Coast Guard. ROISIN class, Irish Navy. OFFSHORE PATROL VESSEL REFERENCES Displ. Speed Engine (GT) (Kn) Chilean Navy (DGTMMN) Piloto Pardo Class Colombian Navy Plan ORION Indian Coast Guard Indian Coast Guard Samar Class Indian Navy Irish Navy Roisin Class Italian Navy Comandanti Class Italian Navy Sirio Class Philippines Coast Guard Portuguese Navy Viana do Castelo Class Royal Moroccan Navy Royal Navy Royal Navy River Class Royal New Zealand Navy Otago Class South Africa Sarah Baartman Spanish Navy Trinidad & Tobago Coast Guard Venezuelan...

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