Pressure relief valves (PRVs) are a very significant source of
process emissions, leaks and releases as shown in Table 1. The
majority of leakage is caused by the globally dominant PRV, which
is a metal-seated direct-spring type that is prone to seat leakage
even when new.
Table 1. Typical leak rates from selected
components
Component type
Average loss volume,
Mcf/y
Pressure relief valve
15.48
Open-ended line
15
Flange
13.24
Gate valve
13.19
Gate valve stem packing
11.71
Plug valve stem packing
9.54
Grease fitting
9.0
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