Controllable-Pitch Propeller (CPP) · Shaft Line & Propulsion
A large-diameter (6 m) controllable‑pitch propeller from Rolls‑Royce/Kongsberg Kamewa, featuring five nickel‑aluminium bronze blades and designed for low‑speed operation around 140 rpm.
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| Hub oil sample / water content check | every 3-6 months, more often if there is a history of water ingress |
|---|---|
| Hydraulic oil filter change | per the manufacturer's schedule, commonly annually or every 2,000-4,000 running hours |
| Pitch feedback calibration check | annually |
| Blade and hub seal inspection | at each drydocking, typically every 2.5-5 years |
| Full system overhaul | aligned with the class special survey / drydock cycle, commonly around every 5 years |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Blade/hub seal leak-off rate | renew seals once leakage exceeds the acceptable rate stated for this unit size in the manufacturer's own criteria - this varies by system and should not be assumed from a generic figure |
|---|---|
| Hub oil water content | investigate the source of ingress and consider seal renewal once water content by the specified test method exceeds the vessel's planned-maintenance limit for this system |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Controllable-pitch propeller systems of this size are normally covered by a class-approved planned maintenance system or continuous machinery survey arrangement; expect class to review hub oil sampling records, pitch feedback calibration records, and blade/seal condition reports, particularly at drydock special surveys, along with confirmation that the emergency/local pitch control means is operable.
Estimated lifetime: Blades and the hub structure are generally designed for the vessel's full service life (multiple decades) with periodic seal, bearing and hydraulic component renewal; wear items such as seals and pump components are renewed on a multi-year cycle driven by condition rather than a fixed running-hours figure - confirm renewal intervals against the vessel's class-approved planned maintenance system.
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