Definition(s)
Cold Differential Test Pressure (CDTP)
Pressure at which a pressure-relief valve is adjusted to open on the test stand. NOTE The cold differential test pressure includes corrections for the service conditions of back pressure or temperature or both.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global Standards
Cold Differential Test Pressure
Inlet static pressure at which a pressure-relief valve is adjusted to open on the test stand.
NOTE: The CDTP includes corrections for the service conditions of backpressure or temperature or both.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards