Propulsion Equipment · Shaft Line & Propulsion
Kamewa waterjets from Kongsberg Maritime are marine propulsion units that generate thrust by accelerating a stream of seawater through an inboard pump and discharging it astern through a steerable nozzle. They are installed at the transom, with the pump section inside the hull and the steering and reversing gear at the stern, and are driven by the main engines or gas turbines through a shaft line or gearbox. The listed approvals are DNV and ABS, and the product is shown as still in production.
| Bearing/seal water strainer cleaning | routine; frequency depends on water quality |
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| Hydraulic oil and filter change (steering/reverse system) | typically every 1000-2000 hours or annually - confirm against the maker's manual |
| Impeller and inlet grid inspection | typically at each haul-out/dry-docking or after any suspected debris strike |
| Bearing inspection | condition-based on vibration/temperature trend, per the maker's schedule |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Bearing and impeller-to-liner clearance | bauart-typical values vary significantly by waterjet size and model - confirm against this unit's own maker manual rather than a generic figure |
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Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Waterjet units supporting main propulsion are surveyed similarly to other propulsion shafting - class looks for bearing clearance/vibration trend records, steering/reverse system function tests, and inlet grid condition at dry-docking.
Estimated lifetime: Bearings and seals typically need renewal in the 15000-30000 hour range depending on water quality and debris exposure; the housing/impeller itself commonly lasts the life of the vessel with periodic component renewal - confirm against the maker's own guidance for this unit size.
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