ASME relief valve lifts below expected setpoint or weeps continuously.
1
System pressure genuinely reaching valve set pressure
criticalCheckCompare gauge/transducer reading to relief valve nameplate set pressure at time of lift.
FixCorrect root overpressure cause (see high-pressure flow) before touching the relief valve.
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2
Valve seat fouled with debris or corrosion
criticalCheckWith system depressurized (LOTO/0 PSI), inspect seat for pitting or debris causing early leak-by.
FixReplace relief valve — do not attempt to lap or repair an ASME safety valve in the field.
SafetyNever disassemble or adjust an ASME-stamped safety valve; replace as a unit.
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3
Valve set pressure too close to normal operating pressure
highCheckCompare normal max operating pressure to relief set pressure — should have adequate margin per code.
FixVerify correct valve selected for the application per vessel nameplate/ASME code; do not simply raise the setpoint.
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4
Thermal expansion of trapped liquid (rare, e.g. water-cooled lines)
CheckCheck for isolated liquid-filled sections without expansion relief.
FixAdd thermal relief valve on trapped liquid sections per code.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.