Abstract
For the guide to improve the ship propulsion system reliability, MESJ Boiler Committeecollected the failure data occurred in 15 turbine ships launched about 1972, 1973 under the helpof those ship's owners. According to the analysis of those data, this report presents the statisticaland physical characteristics of serious failures troubled above turbine ships. As for the statistical characteristics, mean failure time is 9.6 hours which is shortened with the comparison of 10.45, 15.6hours of the ships launched about 1966, 1967. MTBF is 3717 hours, which is longer than 1547 and 1200 hours of those ships launched about 1966, 1967 and about 1969, respectively.Therefore mean availability is fairly improved to 0.9975. The 56% of the total failures has occurredin the boiler systems, being most responsible for the propulsion system reliability. The turbinesystems have a minor responsibility for the failure occurrence, but their mean failure time is thelongest of 22 hours. As for the physical characteristics, the leakage failure is most important, whichoccurred in any equipment of the propulsion system. Among the equipments composing the boilersystem mechanical failures of GAH and leakage failures of FWC should be paid attention. GAH and FWC failures are apt to break down the total propulsion system. The turbine system were troubled mainly by the failures due to the defects of lubricating equipments and due to the vibration eventsof components.
