Abstract
In case of analyzing the reliability data, we should consider that some different condition like a building age, technical skill, quality of material, sea condition, atmosphere condition and fuel oil quality. Diesel ship's relability is increasing due to set up mechatronic system in these years. But it can say that mechatronics system is increasing the failure rate caused by itselves. We analyzed about alarm rate of 47 modernized M0 ships and these summary as follows. Total alarm rates are 11. 1 cases per a month in 1981 to 1988, and it mean that an alarm occurred once per 3 days. Alarm rates of auxiliary equipment and auxiliary boiler system are over the average. Alarm rates of main engine system are closed to the average, but other rates are positioned in lower rate zone. The following items are requsted to increase reliability in future, but alarm rates of them are high level. They are boiler miss firing, L0 purifier abnormal leakage, C fuel oil purifier abnormal leakage, C fuel oil purifier abnormal leakage, bilge well high level, distillateplant high saliniity, bilge pump long running, M/E exhaust gas high temperature and soot-blow off system abnormal. Heavy failure occurred about 2% of total alarms, this failure occurred each 3500 hrs and system abnormal time is 87 minutes per case. But system abnormal time without alarm is 134 minutes per case. In comparison between the item number of alarm and alarmless (alarm rate is less than 8 year), the former items are 128 (62%) and the latter items are 80 (38%) . Therefore we can make reducing the measuring points due to change the setting position of them and to use the another equipment or to have additional cycle check in engine room.
