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AVAILABILITY PERFORMANCE

AVAILABILITY PERFORMANCE. THIS IS THE KEY TO PRODUCTIVITY IMPROVEMENT. IT IS ESSENTIAL TO STUDY THIS IF WE ARE TO DO ANY IMPROVEMENT TO MAINTENANCE. GENERALLY A MACHINE (OR A SYSTEM) CONTINUES TO WORK ( UP TIME ) UNTIL IT BREAKSDOWN. ONCE A FAILURE OCCURS, IT IS REFERRED TO

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AVAILABILITY PERFORMANCE

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  1. AVAILABILITY PERFORMANCE THIS IS THE KEY TO PRODUCTIVITY IMPROVEMENT IT IS ESSENTIAL TO STUDY THIS IF WE ARE TO DO ANY IMPROVEMENT TO MAINTENANCE

  2. GENERALLY A MACHINE (OR A SYSTEM) CONTINUES TO WORK (UP TIME) UNTIL IT BREAKSDOWN. ONCE A FAILURE OCCURS, IT IS REFERRED TO A PERSON (OR A SYSTEM) WHICH WILL PUT IT BACK TO OPERATION. IT WILL TAKE SOME TIME FOR THEM TO RESPOND (WAITING TIME) AND WILL START ATTENDING TO IT. AFTER THE ELAPSE OF THE ACTUAL REPAIR TIME THE MACHINE WILL BE BACK IN OPERATION.

  3. THIS PROCESS WILL CONTINUE AND GO THROUGH A NUMBER OF CYCLES DURING THE LIFE TIME OF THE MACHINE. FOR A GIVEN SYSTEM or a MACHINE IT WILL BE POSSIBLE TO CALCULATE • MEAN WAITING TIME (MWT) • MEAN TIME TO REPAIR (MTTR) • MEAN TIME BEFORE FAILURE (MTBF)

  4. RUNNING TIME OF ANY OPERATION BREAKDOWN PERIODS START time OPERATION PERIODS WHAT ARE THE REASONS FOR LONG BREAKDOWN PERIODS

  5. A GOOD MAINTENANCE MANAGER SHOULD BE ABLE TO IDENTIFY REASONS for any excessive delays in breakdowns

  6. LET US EXAMINE THIS SITUATION MORE CAREFULLY THIS COULD BE EXAMINED BY IDETIFYING MTBF MWT MTTR

  7. DEFINITION 1 b1 b2 b3 b4 R1 R2 R3 R4 R5 OPERATION PERIODS (R1+R2+R3+R4+ ... ) (No. of Breakdowns) MTBF = MEAN TIME BEFORE FAILURE

  8. MTBF : Mean Time Before Failure can be split into two components Supplied Reliability Performance & User Dependent Reliability Performance HENCE IT DEPENDS ON RELIABILITY PERFORMANCE

  9. DEFINITION 2 BREAKDOWN PERIODS b1 b2 b3 b4 b1, b2 … consists of two components Waiting for the actual repair to begin AND Duration of actual repair

  10. Waiting for the actual repair to begin THE AVARAGE OF THESE TIMES IS THE MEAN WAITING TIME MWT Duration of actual repair THE AVAERAGE OF THESE PERIODS IS THE MEAN TIME TO REPAIR MTTR

  11. MWT THIS IS DEPENDENT ON MAINTENANCE SUPPORT PERFORMANCE MTTR THIS IS DEPENDENT ON MAINTENANABILITY

  12. RELIABILITY PERFORMANCE (MTBF) DEPENDS ON THE FOLLOWING FACTORS • Design & construction • Installation • Overloading • Raw material quality • Environment • Skills and abilities of operators • Quality of maintenance work • Reliability performance of Maintenance • subsystems CONTINUED

  13. RELIABILITY PERFORMANCE (MTBF) DEPENDS ON THE FOLLOWING FACTORS CONTINUED • Quality of spares • Preventive maintenance • Operating conditions • Interlocking systems • Quality of materials • Redundancy • Modifications • Age • Supporting services (Electricity & water)

  14. MAINTENANCE SUPPORT PERFORMANCE (MWT) DEPENDS ON THE FOLLOWING FACTORS • Good organization • Good communication • Access to spares • Technical documentation • Access & simplicity • Skill and experience of people • Ease of trouble shooting • Cooperation between departments • Information systems CONTINUED

  15. MAINTENANCE SUPPORT PERFORMANCE (MWT) DEPENDS ON THE FOLLOWING FACTORS CONTINUED • Workshop facilities • Right personal management • Handling of equipment • Planning • Spare-part management • Infrastructure • Work environment • Manpower availability • Proper tools

  16. MAINTENABILITY PERFORMANCE (MTTR) DEPENDS ON THE FOLLOWING FACTORS • Design for accessibility • Complexity/simplicity • Location & layout • Use & supply of proper instruction manuals • (in time) • Work performance • Aids & facilities for maintenance • Accuracy & standardization of spares • Powering down systems CONTINUED

  17. MAINTENABILITY PERFORMANCE (MTTR) DEPENDS ON THE FOLLOWING FACTORS CONTINUED • Safety • After-sales service • Maintenance should match available skills • Availability of special tools • Ease of replacement/repair • Readiness to redesign

  18. IT IS THE JOB OF THE MAINTENANCE MANAGEMENT TO IDENTIFY THE EXACT REASONS

  19. IDENTIFY THE EXACT REASON FOR THE DELAY IN YOUR ORGANIZATION AND .... of course ... GIVE A SOLUTION !!!

  20. YOU WILL BE IMPROVING THE SITUATION

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