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 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.

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)

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

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

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

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

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

Duration of actual repair 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

Duration of actual repair 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

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

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

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)

MAINTENANCE SUPPORT PERFORMANCE DEPENDS ON THE FOLLOWING FACTORS (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

MAINTENANCE SUPPORT PERFORMANCE DEPENDS ON THE FOLLOWING FACTORS (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

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

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

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

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

IMPROVING THE SITUATION YOU WILL BE IMPROVING THE SITUATION