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1. Key Testing Standards
Different industries and regions possess their own cryogenic testing instructions. Common standards are as follows:
|
Standard |
Name / Range |
|
J-30 |
Generally found in specific engineering company standards |
|
BS 6364 |
British Standard, cryogenic valve testing, frequently used |
|
ISO 28921 |
International Standard, cryogenic isolation valves for industrial uses |
|
API 6D |
Pipeline valve standard, includes cryogenic testing needs |
|
MSS SP-134 |
Means for cryogenic valve testing |
2. Guidelines for Passing the Test
Operational Performance: The valve can smoothly finish full-travel opening and closing at low temperatures without binding or unusual noise.
Sealing Leak Rate: Normally required to be extremely low (e.g., BS 6364 demands gas leak rate below a designated value).
No Visible Breakage: Visual examination after testing indicates no defects or permanent distortion.
Performance after Recovery: Nevertheless meets room-temperature sealing needs after being restored to environmental temperature.
3. Intended Applications
LNG Terminals: Valves on loading/unloading arms must pass cryogenic inspection
Air Separation Units: Valves in liquid oxygen and liquid nitrogen pipelines
Space Launch Sites: Valves in liquid hydrogen/liquid oxygen fueling systems
Cryogenic Storage Vessels: Inlet/outlet isolation valves
Summary
Cryogenic testing is a specialized test that carries out valve opening/closing operations and sealing validations at extreme low temperatures in the range of liquid nitrogen temperature (-196°C). It is a critical verification method to guarantee safe and reliable valve operation in cryogenic applications including LNG, air separation, etc. Ordinary standards include J-30, BS 6364, and so on.
