MTTR and MTBR Calulation

[Former Member]

Hi

Can Anyone Explain me how MTTR and MTBR is calculated for following cases.

1.What will be the MTTR and MTBR for the Equipment which is breakdown for the first time.

2 And How to calculate MTTR and MTBR for equipment which got breakdown for more the one time,

3. what are all the thing taken in consideration for calculating the MTTR and MTBR.

4. Can we convert the MTTR and MTBR reports in days which is currently in hours in system.

[jogeswararao_kavala · Accepted solution]

Hi Sandeep,

Let's first understand the concept.

Suppose an Equipment started operations and worked for 1 year. Suppose this equipment underwent Breakdown for 5 times in this period. like this

1st  for 10 hrs

2nd for 3hrs

3rd  for 8hrs

4th for  20hrs

5th for 17hrs

MTTR = (10 + 12 + 8 + 20 + 5) / 5    = 11Hrs

MTTR is nothing but the average Repair period.

Now what is MTBR?

Think about the intervals between these Breakdowns.

Interval between 1st and 2nd Breakdown -  80 days (1920 hrs.)

                         2nd and 3rd    --               30days (720 hrs)     

                         3rd and 4th     --              180 days (4320 hrs)

                         4th and 5th     --                20 days (480 hrs)

MTBR =  ( 1920 + 720 + 180 + 20 ) / 4   =  3720 hrs

Now let's come to you queries

1. Obviously MTTR for the 1st breakdown will be equal to the Downtime of the first breakdown.

    MTBR not applicable because there is only one breakdown.

   Even MTTR is nor applicable for this very reason.

2 & 3  I think these have been answered in detail.

For Calculations of MTBR, the Startup date in Equipment Master is taken as reference date. If this field is blank, then the Malfunction Start Date of your 1st Breakdown Notification will be taken as reference date.

4. For this you need to go for a simple development.

Jogeswara Rao K