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Effectiveness Performance IndicatorsEffectiveness in this context refers specifically to the effectiveness of the maintenance function in maintaining the assets.Various measures of performance for the evaluation of maintenance effectiveness and efficiency exist, the most important of which are related to availability, reliability and maintainability.Differentiating Between Failure Metrics System FailureSystem FailureResume Normal OperationsTime between FailuresTime to RepairTime to FailureCalculation of MTBF, MTTR and MTTF User specified periodRunningDownLLRRRJJCommissioningFormulas for MTBF, MTTR and MTTF MTBR MTTF + MTTRAVAILABILITYIt is the ability of an item to be in a state to perform a required function under given conditions at a given instant of time or during a given time interval, assuming that the required external resources are provided.AVAILABILITYThe two terms that define availability are Reliability and Maintainability.

Where:MTBF: Which is a functional reliability measure that relates to the technical system or Equipment, and the objective is to maximize the value of this term.AVAILABILITYMTTR: Which is a maintainability measure that relates to the technical system or Equipment, and the objective is to minimize the value of this term.It follows therefore that improved availability performance can only be achieved by increasing the MTBF or decreasing the MTTR ORORRELIABILITYIt is the ability of an item to perform a required function under given conditions for a given time interval.

Reliability is calculated either as MTBF or MTTF using the formula above.

RELIABILITYPoor reliability does not necessarily result in low availability. Frequent failures of short duration such as trip outs could have a negligible effects on availability yet be very disruptive to the operations process.

MAINTAINABILITYIt is the ability of an item under given conditions of use, to be retained in, or restored to, a state in which it can be perform a required function, when maintenance is performed under given conditions and using stated procedures and resources.

MAINTAINABILITYIt is the ability of an item under given conditions of use, to be retained in, or restored to, a state in which it can be perform a required function, when maintenance is performed under given conditions and using stated procedures and resources.Maintainability in terms of MTTR is calculated according to the above formula.

MAINTAINABILITYPoor maintainability performance in terms of repair or downtime will have a direct adverse effect on the availability because every time unit of downtime incurred will reduce the availability time for operations.This, is however, only true if the downtime is incurred when the equipment is required for operations.

FACTORS THAT EFFECTS THE FAILURE METRICS:

MTBF Condition monitoring Design Redundancy Choice of equipment or components

FACTORS THAT EFFECTS THE FAILURE METRICS:

MTTR Organization Structure Information systems used Routines employed Education of work force Training

Calculate the Availability of the plant from the records specified below: Shut Down Start UpDate

Time

Date

Time

Time between failuresUp time

Down time

5/4/20149:005/4/201411:0025/4/201423:006/4/20143:001412412/4/201414:0012/4/201419:00159155516/4/201413:0016/4/201413:3095900.519/4/20147:0019/4/20149:006665.5229/4/201521:00254252Total588574.513.5

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THE END6/3/2014