A study of coming generation NK-MO ships

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A study of coming generation NK-MO ships

Ohashi, M. / Yamada, H. / Ishida, K.

According to analyses made of the failures of propulsion machinery on MO ships, the cases where engine-room personnel found failures without alarms and stopped or reduced the main engine load by manual operation shared more than 50 % of the total cases affecting the ship service. Large parts of monitoring and operation still depend on human senses and manual operation even in a modern automated propulsion system. The machinery failures were divided into two groups at 6 occurrences/10000 hours under way. Machinery in the upper group requires re-examination in order that improvements in reliability can be made, while the lower group already has considerable reliability. Most types of machinery have individual failure patterns in the common codes of failure phenomena. These patterns, combined with factors such as temperature, pressure, electric current, working hours, etc. can be utilized as a judgement element in plant performance or condition monitoring for short or long periods.