Definition(s)
Conventional Pressure-Relief Valve
Spring-loaded pressure-relief valve whose operational characteristics (set pressure, closing pressure, and relieving capacity) are directly affected by changes in the backpressure.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards
Conventional Pressure-Relief Valve
Air required to combust the flare gases.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global Standards