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Safety evaluation for serious failure of ship machinery

机译：船舶机械严重故障的安全性评估

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The reliability index gives concrete evaluation value to improve the quality on the design side. On the other hand, the maintainability index gives a key for judgment of work load and to find crew's optimum number to the operator. However, the index for evaluating the ship operational efficiency is few so far.1),2) Availability index is one of the evaluating value for the ship operational efficiency. But if this index is applied to the marine plant, value of each equipment is very similar, because the each equipment MTFR is very short compare with the MTBF. The hazard index, which is proposed for the first time in this paper. Serious failure is a malfunction caused by the operation trouble like a stoppage and/or slow down of main engine. The cases of serious failure per 1000 hours is the serious failure rate. The hazard index is defined as the result of multiplying the effect hour per case [min/case] by the serious failure rate [cases/1000 hrs]. The effect hour means the operation delayed-hour due to trouble, which gives a serious effect on the operation performance. The hazard index is considered to be very appropriate for evaluating the ship operational efficiency. Because, the hazard index is a value of disable operation hour [minute] which is occurred during the operation for the 1000 hours, the size of this value is evaluation index of the ship's safety. This paper introdeces the reliability analysis on the serious failure situations which is the result of investigate on the statistical database. The data had been collected from 1982/3 to 1997/3 and this involved 186 diesel vessels and 27 turbine vessels. Total failure cases of Diesel Plant was 97131. And Steam Turbine Plant failure cases was 9269. As a result of evaluation value for the turbine plant by using the hazard index, the degree of operation hazard is 60 percent compared with diesel plant. The number of failures of equipment with alarm system is smaller than that of equipment without alarm by 10 to 20 percent. The operational efficiency can be expressed numerically by adopting the hazard index. And, present tendency shows the reliability index and safety index is strongly affected by man-hour, and it is clear that maintenance man-hour as well as the failure rate should be decreased
机译：可靠性指标为改善设计方面的质量提供了具体的评估值。另一方面，可维护性指标为操作人员判断工作量和找到机组的最佳人数提供了关键。然而，到目前为止，评价船舶运行效率的指标很少。1），2）可用性指标是船舶运行效率的评价值之一。但是如果将此指标应用于海洋工厂，则每个设备的价值非常相似，因为与MTBF相比，每个设备的MTFR都非常短。危害指数是本文首次提出。严重故障是指由于主机停机和/或减速等操作故障而引起的故障。每1000小时严重故障的情况就是严重故障率。危险指数定义为每例的影响小时数[min / case]乘以严重故障率[cases / 1000 hrs]的结果。有效小时是指由于故障导致的操作延迟时间，对操作性能造成严重影响。危害指数被认为非常适合评估船舶的运行效率。因为危险指数是在运行1000小时的过程中发生的无效运行小时[分钟]的值，所以该值的大小是船舶安全性的评估指标。本文介绍了严重故障情况下的可靠性分析，这是对统计数据库进行调查的结果。数据收集自1982/3至1997/3，涉及186艘柴油船和27艘涡轮船。柴油机故障总数为97131例，汽轮机​​故障例为9269例。使用危险指数对涡轮机进行评估的结果是，与柴油机相比，操作危险度为60％。带警报系统的设备的故障数量比没有警报的设备的故障数量少10％到20％。通过采用危险指数可以用数字表示运行效率。并且，目前的趋势表明可靠性指标和安全性指标受工时的强烈影响，并且很明显，应该减少维护工时以及故障率

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