Application to a Hydraulic Winch System

To demonstrate the described approach, the data from a fishing vessel is used as a test case (Pillay (2001)). The data collected for the test case is in the format of repair data. It includes  

Specialists/contract workers cany out the repairs for this particular vessel in the floating dock. Should a failure occur during operation at sea, temporaiy repair is carried out by the crew and the equipment is kept operating in the abnormal condition. No records are kept of any temporary repairs done on board, however, a repair list is compiled by the C hief Engineer for the equipment to undergo permanent repair work at the next docking . 

These limits are then converted into failure rates by the following formula 1 

A failure rate is calculated under the assumption that the mean down time and repair time are very small compared to the operating time. The MTBF is then converted to failure rate using Equation (6.21) and is reflected along an ordinal scale as shown in Table 6.3. 

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