Valve Standard Reference
API 622
AmericanAPI 622 - Type Testing of Process Valve Packing for Fugitive Emissions
API 622 specifies type testing requirements for compression packing used in gate, globe, and other rising-stem valves to qualify packing sets for fugitive emissions service - complementing API 641 for ball valve stem seals.
Overview - API 622
API 622 specifies type testing requirements for compression packing used in gate, globe, and other rising-stem valves to qualify packing sets for fugitive emissions service - complementing API 641 for ball valve stem seals.
Scope
API 622 defines type testing procedures for valve packing systems to demonstrate compliance with fugitive emissions requirements. The test uses a 2-inch Class 600 gate valve as the reference valve, subjected to 1,500 thermal cycles while monitoring helium leak rates at the stem packing. Packing that passes API 622 is qualified for service in valves where fugitive emissions control is required by environmental regulations.
Applicable Valve Types
Gate Valves
Globe Valves
Applicable Pressure Classes
Key Requirements - API 622
Test valve: 2-inch Class 600 gate valve with rising stem
Test fluid: helium at 600 psig (41 bar g)
Thermal cycling: 1,500 cycles between ambient and 450°F (232°C)
Acceptance: leak rate not to exceed 100 ppm v/v (EPA Method 21 equivalent)
Packing qualification applies to the specific packing set, stuffing box geometry, and stem diameter tested
Third-party witness testing at accredited laboratory required for qualification certificate
Testing Requirements - API 622
1,500 thermal cycle helium leak test
Witnessed by independent third party
Documentation Required for API 622 Compliance
API 622 qualification certificate with packing manufacturer
Test report with cycle data and leak measurements
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