A compactly designed axial pump with excellent efficiency, cavitation and noise characteristics.
The waterjet unit is completely pre-assembled, thereby reducing installation time.
High performance components in stainless steel to prevent wear and corrosion.
The water lubricated bearing in the stator bowl provides an environmentally friendly solution.
Water lubricated Face type sterntube seal with an optional inflatable emergency seal.
Inboard mounted thrust bearing block, for increased life and easy maintenance.
Inboard hydraulics provide an environmental friendly solution, increased life and easy maintenance.
Machinery controls integrated within the unit.
The characteristics of a waterjet make it a good propulsor for numerous applications.
Examples of such applications include:
During operation, water enters the waterjet through the inlet duct, which is part of the ship’s construction. After passing the pump impeller, the rotation in the flow is removed and the water is accelerated in the stator bowl. This creates the thrust necessary to propel the ship. For steerable waterjets, the jet stream is deflected by a jetavator which is mounted behind the stator bowl. The jetavator is actuated by an inboard mounted hydraulic cylinder and can be turned 30° to port and 30° to starboard.
The jetavator contains a hydraulically activated reversing plate through which part or all of the jet stream can be deflected forward. The reversing plate can be gradually moved, which makes it possible to vary the thrust from full ahead via the zero thrust position to full astern and vice versa.
The zero thrust position prevents the ship from moving when the impeller shaft is clutched in. The reverse cylinder is equipped with a counter balance valve (load holding valve). This safety device keeps the reversing plate movement controllable and prevents that, in the event of a hose failure, the reverse plate from moving to full astern without control.
In addition to the main waterjet hardware, Wärtsilä can supply other equipment that can be integrated as part of the Wärtsilä solution.
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Wärtsilä is a global leader in advanced technologies and complete lifecycle solutions for the marine and energy markets. By emphasising sustainable innovation and total efficiency, Wärtsilä maximises the environmental and economic performance of the vessels and power plants of its customers.