Corrective-Maintenance_Engineerings.pptx

Industrial

1. Corrective Maintenance (CM) R. M. SHAHBAB Lecturer, Department of IPE, BUET Email: [email protected]

2. Reference Chapter 5 - Engineering Maintenance, A Modern Approach, B.S. Dhillon, CRC Press, 2002

3. Thread Standards and Definitions Introduction Corrective maintenance may be defined as the remedial action carried out due to failure or deficiencies discovered during preventive maintenance, to repair an equipment/item to its operational state. Corrective maintenance is an unscheduled maintenance action, composed of unpredictable maintenance needs.

4. Thread Standards and Definitions Corrective Maintenance Types There are five type of corrective maintenance:

5. Thread Standards and Definitions Corrective Maintenance Types Fail-repair: The failed item is restored to its operational state . Salvage: This element of corrective maintenance is concerned with disposal of nonrepairable material and use of salvaged material from nonrepairable equipment/item in the repair, overhaul, or rebuild programs. Rebuild: This is concerned with restoring an item to a standard as close as possible to original state in performance, life expectancy, and appearance. This is achieved through complete disassembly, examination of all components, repair and replacement of worn/unserviceable parts as per original specifications and manufacturing tolerances, and reassembly and testing to original production guidelines

6. Thread Standards and Definitions Corrective Maintenance Types Overhaul: Restoring an item to its total serviceable state as per maintenance serviceability standards, using the “ inspect and repair only as appropriate ” approach. Servicing: Servicing may be needed because of the corrective maintenance action, for example, engine repair can lead to crankcase refill, welding on, etc. Another example could be that the replacement of an air bottle may require system recharging.

7. Thread Standards and Definitions Corrective Maintenance Steps We assume that corrective maintenance is composed of five major sequential steps: fault recognition , localization , diagnosis , repair , and checkout

8. Thread Standards and Definitions CM Downtime Components Major downtime components are: Active repair time: Preparation time Fault location time Spare item obtainment time Fault correction time Adjustment and calibration time Checkout time Administrative and logistic time Delay time