AVAILABILITY PERFORMANCE
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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

AVAILABILITY PERFORMANCE

THIS IS THE KEY TO

PRODUCTIVITY IMPROVEMENT

IT IS ESSENTIAL TO

STUDY THIS IF WE ARE TO

DO ANY IMPROVEMENT

TO MAINTENANCE


Availability performance

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.


Availability performance

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)


Availability performance

RUNNING TIME OF ANY OPERATION

BREAKDOWN PERIODS

START

time

OPERATION PERIODS

WHAT ARE THE REASONS

FOR LONG BREAKDOWN PERIODS


Availability performance

A GOOD MAINTENANCE MANAGER

SHOULD BE ABLE TO

IDENTIFY REASONS

for any excessive

delays in breakdowns


Availability performance

LET US EXAMINE THIS

SITUATION MORE CAREFULLY

THIS COULD BE

EXAMINED BY IDETIFYING

MTBF

MWT

MTTR


Availability performance

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


Availability performance

MTBF : Mean Time Before Failure

can be split into

two components

Supplied Reliability Performance

&

User Dependent Reliability Performance

HENCE IT DEPENDS ON

RELIABILITY PERFORMANCE


Availability performance

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


Availability performance

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


Availability performance

MWT

THIS IS DEPENDENT ON

MAINTENANCE SUPPORT PERFORMANCE

MTTR

THIS IS DEPENDENT ON

MAINTENANABILITY


Availability performance

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


Availability performance

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)


Availability performance

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


Availability performance

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


Availability performance

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


Availability performance

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


Availability performance

IT IS THE JOB

OF THE

MAINTENANCE MANAGEMENT

TO IDENTIFY

THE EXACT REASONS


Availability performance

IDENTIFY THE EXACT REASON

FOR THE DELAY

IN YOUR ORGANIZATION

AND ....

of course ...

GIVE A SOLUTION !!!


Availability performance

YOU WILL BE

IMPROVING THE SITUATION