Kongsberg Steel Waterjet S-4

Kongsberg Maritime is improving and streamlining its steel series waterjets, further raising the unit efficiency as well as lowering the cost of ownership. A modular system provides a choice of inlet materials and installation strategies. The S4 waterjets provides the best pump efficiency on the market, for each operational profile and purpose. The efficiency is improved over the whole speed range, and matches the increased demand of vessels even below 30 knots. This translates into reduced fuel consumption for a given workload and consequently reduced CO2 emissions, as well as increased range. Environmental benefits are achieved not only by increasing efficiency, the inboard hydraulics also reduce the risk of oil spill. The steel series incorporates numerous improvements made possible by advanced design calculation methods and testing and production techniques. The compact reversing bucket and steering nozzle enables superior position keeping and manoeuvrability at low and high speed. This reduces fuel consumption and lowering noise and emissions in harbour manoeuvring, as well as saving time and increasing safety. In high speed turns the steel series maintains speed very efficiently, which is a highly appreciated benefit for patrol vessels and others alike. At the heart of the waterjet is the fully stainless steel mixed flow pump. There are different impellers depending on application. Efficiency has been achieved by using the latest computational fluid dynamics (CFD) techniques combined with extensive testing in the cavitation tunnels at the Kongsberg Maritime Hydrodynamic Research Centre. The steel series waterjets can be individually optimised and selected based on boat design requirements and operational profile.