Overpressure (Relieving Device)

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Pressure increase over the set pressure of a relieving device.

NOTE: In the latter context, overpressure is the same as accumulation (3.1) only when the relieving device is set to open at the MAWP of the vessel.

Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global Standards

Pressure increase over the set pressure of a relieving device.

NOTE: In the context of a relieving device, overpressure is the same as accumulation (3.1.1) only when the relieving device is set to open at the MAWP of the vessel.

Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards

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