最近のタ-ビン船におけるボイラ系故障について

概要

論文の詳細を見る
MESJ Boiler Committee collected the failure data occurred in 15 steam ships launched about 1972, 1973 under the help of those ships' owners. Following the former report, which analyzed the serious failure out of above data, this report considers the statistical and physical characteristics of the boiler failures. The consideration shows some features of the boiler failure as follows. It is noted that the pattern of the failure rate with respect to time appears to have no random failure component, that is, the failure rate increases with time immediately from the end of the period of the early life failure which is about 1 year. Among the equipments composing the boler system the nine ones, that is, steam generating section, level meter, relief valve, pipings, ordinary valves, sootblower, GAH, FWC, and STC, have the main liability for the unreliability of the boiler system. Those failures account for 75% of total failures and 83% of serious ones. As for the failure phenomena leakage failures are predominant, and occupy the greater portion of the failures of the steam generating section, valves, pipings, FWC, and STC. Through the whole equipments the valve failures are remarkedly many, accounting for 31% of total failures, and about 50% of them are found at control valves. The greater part of FWC and STC failures are due to control valve defects.
公益社団法人日本マリンエンジニアリング学会の論文