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Pressure - the term pressure shall be interpreted as the difference between internal pressure and external pressure acting across a component/system.
Burst Pressure - Pressure across a component, or within a system, at which failure by burst is calculated to occur.
Proof/Hydrostatic Test Pressure - Constant pressure, higher than the design pressure, applied to a component/system for a limited duration to demonstrate its integrity without causing destruction or deterioration. Must be less than the calculated Burst Pressure.
Incidental Overpressure - Pressure in excess of design pressure, experienced during transient conditions of limited duration and frequency, such as excessive surge pressure, unintended shutin pressure, or any temporary incidental condition. Must be less than the Proof/Hydrostatic Test Pressure.
Design Pressure - Maximum pressure that the component/system is designed to contain in service, inclusive of MAOP, normal shutin pressure and if applicable, vacuum conditions and static pressure head, at the associated design temperatures. Must be less than the Proof/Hydrostatic Test Pressure and any applicable Incidental Overpressure. May be equal to the MAOP.
Equivalent Terms
Internal Design Pressure - ISO 13623
Rated Working Pressure - ISO 10423, 13628-4 & -6 & -7
Design Working Pressure - ISO 13628-5
Maximum Allowable Pressure - ISO 13628-7
Maximum Allowable - ISO 13628-7
Design Pressure - API RP1111, API RP14E, API 17J, API 17K, ISO 13628-2 & -6
Maximum Allowable Operating Pressure (MAOP) - Maximum pressure at which a component/system is allowed to be operated. Must be less than or equal to the Design Pressure.
Equivalent Terms
Maximum Operating Pressure - API RP1111
System Operating Pressure - API 17E
Maximum Allowable Operating Pressure - ISO 13623
Surge Pressure - Pressure produced by sudden changes in the velocity of the moving stream of fluids inside the component/system.
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