Vent from containment seal cavity to vapor recovery
Leakage collection for zero to very low process emissions
Safety indicator for primary seal
May be used alone or with Plan 72 on containment seals
Fluids that do not condense at ambient temperature .
High vapor pressure fluids ,light hydrocarbons
Hazardous /toxicfluids .
Clean ,non-polymerizing ,non-oxidizing fluids .
Continuously vent to low pressure vapor recovery /flare
Vent piping should include a condensate drain .
Primary seal leakage is indicated by increased vent pressure
Monitor regularly for valve settings ,blocked lines ,and low
vent pressure .