Regarding the temperature for pressure testing
Thread Content
For carbon steel containers, the standards specify that the temperature for hydraulic testing shall be no lower than 5 degrees, the temperature for pneumatic testing shall be no lower than 15 degrees, and the temperature for airtightness testing shall be no lower than 5 degrees. Who knows why it’s specified this way, why is the pressure test at 15 degrees? How does everyone control the temperature in practice?
Controlling the test temperature during pressure testing is primarily aimed at avoiding the material’s brittle transition temperature, so as to prevent the container from being damaged during the test. The temperature control for the pressure test is set at a higher level because pressure tests are relatively dangerous, hence a larger temperature margin is provided.
As the temperature drops, the plasticity of the material decreases while its brittleness increases. If the temperature is too low during a hydrostatic test, it can lead to brittle fracture of the container, putting the test in a dangerous situation.