Maintenance is execution of all PM,PdM and corrective repair activities based on CM (Condition monitoring ) results as per SMP.An effective and efficient maintenance team will result in decreased MTTR which will enhance the Availability of equipment.
Reliability function is basically a function of thinker group who is responsible for developing procedures and checklist, analysing root cause failure analysis (RCFA) ,Optimizing Preventive and Predictive maintenance programme in order to optimize maintenance cost based on improved MTBF.
In my understanding Maintenance and Reliability both are complementary to each other.
As Reliability, Availability and Maintainability are components of Overall Maintenance Effectiveness equation and Reliability is subset of Availability,we may consider Reliability is subset of Effective Maintenance System.
Availability of equipment or system deals with MTTR and can be defined as ratio of UP-Time /(UP-time + Down Time) assuming yearly calender hours as total of up-time and down-time.
On the other hand Reliability deals with MTBF and can be defined as probability that an equipment or system shall perform its intended service under given duty point or operating conditions, given environmental conditions and under given time frame ( In this case budgeted production hours are normally taken as given time period).
Maintainability deals with ease and rapidity at which the repair /maintenance activities are carried out as per SMP.This will have impact on MTTR. Higher MTTR will reduce the availability and low MTTR will enhance the availability.
Overall Effectiveness = Reliability X Availability X Maintainability
Its value varies between 0 to 1 in a 0---1 point scale.
Reliability function is basically a function of thinker group who is responsible for developing procedures and checklist, analysing root cause failure analysis (RCFA) ,Optimizing Preventive and Predictive maintenance programme in order to optimize maintenance cost based on improved MTBF.
In my understanding Maintenance and Reliability both are complementary to each other.
As Reliability, Availability and Maintainability are components of Overall Maintenance Effectiveness equation and Reliability is subset of Availability,we may consider Reliability is subset of Effective Maintenance System.
Availability of equipment or system deals with MTTR and can be defined as ratio of UP-Time /(UP-time + Down Time) assuming yearly calender hours as total of up-time and down-time.
On the other hand Reliability deals with MTBF and can be defined as probability that an equipment or system shall perform its intended service under given duty point or operating conditions, given environmental conditions and under given time frame ( In this case budgeted production hours are normally taken as given time period).
Maintainability deals with ease and rapidity at which the repair /maintenance activities are carried out as per SMP.This will have impact on MTTR. Higher MTTR will reduce the availability and low MTTR will enhance the availability.
Overall Effectiveness = Reliability X Availability X Maintainability
Its value varies between 0 to 1 in a 0---1 point scale.
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