Repeat failure analysis means analysis that handle multiple failures within an item. In a terminal there is a failure occurring on a same equipment repeatedly in that particular period ( i.e. Number of times the same breakdown happened which stopped the operations). As equipment failure frequently occurs, therefore a Repeat Failure Analysis is carried out.
How it is useful?
Let’s start an analysis of Quay Crane
- How many maintenance related failure occurred ?
- How many times there was a requirement to perform a replacement?
- The primary thing here is how many times did they fail repeatedly?
For example , in a QC there was a consistent failure every month and 15 times it has to be repaired (Refer below Fig 01 for month of July on an electrical drive) .
The failure was of an electric drive, we need to analyse how many times a same equipment fail repeatedly in that period, how many breakdown or damage happened that stopped the operation one after another.
Fig 01
The number of repeat failure in QC where repair has to be done is quite high,now what?
Further analysis is done and the information received based on repeat analysis is that number of times there is a repeat failure in QC, which needs to be repaired and it was found many times its maintenance failure. Further analysis is done in that period to know what was performed action, to understand how the problem is fixed. It was found that terminal has to repeatedly make repair on an electric drive. (Refer below Fig 02)
Fig 02
Whenever Technical Department find there is a repeat failure more than acceptable limit for a particular component in a month, they have to set-up a corrective maintenance action along with the next two Preventive Maintenance. Reliability engineers are suppose to execute Corrective Maintenance work orders. These work orders need to be created in ERP application planned along with the maintenance,such Corrective Maintenance work order involves.
- Conditional checks
- Ultrasound and other high technology inspection
- Analyse the RPM (Rotation per minute) check the circuit
(These are specific to an electric drive, for the example being considered.)
The Reliability engineer will also schedule additional Corrective Maintenance work order for applying the decisions made out of the above analysis, which is either replacement of repeated failure( component replaced) OR a modification of the electric drive is suggested, on all such equipments within the terminal.
By looking at these analytical reports ,by doing a good root cause analysis and by referring the number a maintenance manager can analyse why there are repeat failure which are maintenance related most of them are electrical failure & have an operational impact ,
Thus,
- Increase the bottom line(i.e. to reducing expense in future ) OR
- Invest in training the employees on doing better maintenance related to electrical circuit and wring the equipment OR
- Check if there is a requirement to buy better quality spares and many more.
