Kongsberg Maritime Kamewa Waterjets
Kongsberg Maritime Kamewa waterjets provide thrust by accelerating seawater through a high‑pressure pump and nozzle, delivering high speed and excellent maneuverability for vessels requiring shallow draft.
Inspector Detail
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Common issues
- Inlet grid damage or blockage from debris ingestion
- Impeller/rotor erosion or cavitation damage from operation in shallow or debris-laden water
- Bearing wear from inadequate lubrication or loss of seal water supply
- Steering and reverse deflector actuator hydraulic leaks
- Shaft seal leakage
- Vibration from impeller imbalance after a debris strike
Inspection checklist
- Inspect the inlet grid for damage, blockage or missing bars
- Check impeller/rotor blades for cavitation pitting or debris damage
- Check bearing seal water flow and pressure
- Inspect the steering/reverse duct actuator for hydraulic leaks and full travel
- Check the shaft seal for leakage
- Verify vibration levels against baseline
- Check hydraulic oil condition and filter differential pressure on the steering system
Service intervals
| Bearing/seal water strainer cleaning | routine; frequency depends on water quality |
| 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 wear limits
| 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 |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Bearing/seal kit for the waterjet unit
- Shaft seal
- Steering/reverse actuator seal kit
- Inlet grid bars for damage replacement
- Hydraulic filter elements
Safety
- High-pressure water discharge - keep clear of the jet outlet and reverse duct during operation and testing
- Stored hydraulic pressure during actuator maintenance
- Rotating impeller hazard through the inlet if the grid is removed - lock out the drive before entry
Class survey
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.
Components & Design
Component data being added…
Technical Data
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