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.
For Design Pressure & MAWP, read in "Relationship Between Design Pressure & Maximum Allowable Working Pressure (MAWP)".
MOP <= MAOP < Design Pressure <= MAWP
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