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Dear Expert,

I would like to ask your expertise with regard to the reliability calculation of the machine.

I found in the manual the following statement;

"Historically, two 60% capacity machines (in parallel) have been used where the
process plant could still operate stably at 60% capacity when one compressor was
down. Theoretically, overall mechanical reliability of such a system would be 81%
if the reliability of each machine were 90%. However, the overall reliability calculated
in this simple manner would be misleading from the viewpoint of production
because the plant would be producing at a 60% rate when one unit is down. Therefore,
this arrangement would have a production reliability of about 92%.".

My question; How 92% of the production reliability is calculated?

Appreciate your feedback.

Regards,

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