Valve Standard Reference
API 624
AmericanAPI 624 - Type Testing of Rising and Setting Stem Valves Equipped with Graphite Packing for Fugitive Emissions
API 624 extends API 622 by specifying complete valve-level fugitive emissions type testing for gate and globe valves equipped with graphite packing - a valve-level certification complementing the packing-level API 622 test.
Overview - API 624
API 624 extends API 622 by specifying complete valve-level fugitive emissions type testing for gate and globe valves equipped with graphite packing - a valve-level certification complementing the packing-level API 622 test.
Scope
API 624 requires type testing of a complete gate or globe valve assembly with graphite packing to demonstrate fugitive emissions compliance under thermal cycling. Unlike API 622 which tests the packing set only, API 624 tests the entire valve (body, bonnet, stem, packing box, and packing) as a system. 1,500 thermal cycles at 450°F and 600 psig helium, with leak rate measurement at each cycle interval. Valves passing API 624 receive qualification as a valve model for fugitive emissions service.
Applicable Valve Types
Gate Valves
Globe Valves
Applicable Pressure Classes
Key Requirements - API 624
Complete valve assembly test (not just packing): 2-inch Class 600 gate or globe valve
Test fluid: helium at 600 psig; temperature: ambient to 450°F (232°C) cycling
1,500 thermal cycles with leak measurement after cycles 100, 200, 400, 600, 800, 1000, 1200, 1500
Acceptance: leak rate not to exceed 100 ppm v/v at any measurement point
Packing adjustment allowed only at specific intervals per the test protocol
Valve passes as a model family - all sizes/classes of same bonnet design qualified
Testing Requirements - API 624
1,500 thermal cycle helium leak test on complete valve assembly
ISO 21049 or ASME B16.34 dimensional compliance verification
Documentation Required for API 624 Compliance
API 624 type test certificate for valve model
Third-party witnessed test report
Related Standards
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