Reliability of Ship Equipment and Influence of Failures on Navigation

Abstract

In Japan, the Committee for Ship Reliability Investigation had been constructing a database system (SRIC) for the ship reliability. The present SRIC database system of third generation has just became a useful system included over 114000 field data about the failures and alarms of ship equipment pass the long time investigation. This database system has never been carried out in other countries. And it is a relational database system (RDB) constructed by the some data tables and many useful functions. It become clear that the average failure rate of the whole of ship equipment was 7.0 (Occ./1000Hr.) and the average work for repair was 5.0 (Man*Hr./Occ.) through the statistical analysis by SRIC. And, it is noticed that the failure ratio of the miscellaneous equipment included the oil purifiers is about 43 (%). It is a clear that the failures have influence upon the ship navigation directly. Only this direct influence is always attracts attention, but on the other hand the loss of the manning resource by the work for repair is not attached importance. The loss of the manning resource also a factor of influence on the ship navigation. This paper reports the latest results of statistical analysis by SRIC database system and the influence on the ship navigation by the failures.