September 2001

Valves/Loss Prevention

Reduce process emissions and releases from PRVs

Using best available technology makes this doable

Emerson, G. B., Anderson Greenwood Crosby

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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