API STD 622-ed.3

Anotácia textu normy API STD 622-ed.3 :

API STD 622, 3rd Edition, July 2018 - Type Testing of Process Valve Packing for Fugitive Emissions

This standard specifies the requirements for comparative testing of valve stem packing for process applications where fugitive emissions are a consideration. Packing(s) shall be suitable for use at service temperatures –29 °C to 538 °C (–20 °F to 1000 °F). Factors affecting fugitive emissions performance that are considered by this standard include temperature, pressure, thermal and mechanical cycling, and corrosion.

This standard is not intended to replace type testing of valve assemblies or valve production testing.

This standard establishes requirements and parameters for the following tests:

• a) fugitive emissions;
• b) corrosion;
• c) packing material composition and properties;
• d) See Annex C (High Temperature Testing Procedure).

Test methods apply to packing for use in on-off valves with the following stem motion(s):

• a) rising stem;
• b) rotating stem; or
• c) rising and rotating stem.