Abstract
The propeller shaft and white-metal bearings of a shaft are normally inspected every five years by the surveyor of a ship classification society. But this work is time-consuming to ship owners and dangerous at practice site due to its heavy load. We have studied for years whether the analysis of lube oil in service can be used as an alternative to the aforementioned time-based survey. We found that when the wear metal particles derived from propeller shaft and bearing metal in oil is below 30 W.P.C./ml by Ferrograph Analysis(Ferrography) Direct Reading(DR) method, it can be clearly said that the stern tube is in a satisfied lubricating condition and it is not necessary to withdraw the propeller shaft for inspection. We also report some severely damaged cases which Ferrography DR showed to be over 50 W.P.C./ml. Our new experiences, in addition, of wear particles in oil which is in service with
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