Difference between MOP & MAOP?

What is the Difference between MOP & MAOP in process?

Maximum Operating Pressure (MOP)

A maximum pressure at any expected normal operating scenario.

Maximum Allowable Operating Pressure (MAOP)

A maximum pressure that allowable by any equipment and device to operate satisfactory without affecting it performance.

Example, a conventional direct spring loaded pressure relief valve allow MOP is 90% of set pressure whilst a pilot operated pressure relief valve may allow upto 97-98% of set pressure.

MOP <= MAOP < Design Pressure <= MAWP

MAWP - Maximum Allowable Working Pressure

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