Pneumatic testing of pressure vessels: What is the relationship between the airtightness test and the design pressure as well as the nominal operating pressure?
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This post was last edited by kowukaka on 2011-4-20 at 10:22. After checking relevant information, I found that regarding the pressure for the airtightness test, some say it should be equal to the nominal operating pressure, while other sources suggest it should be equal to the design pressure. Which one is correct?
Please check the 150 or the tolerance specifications, as they indicate which pressure is specified.
Oh, got it. I’ll go take a look too
The pressure for the airtightness test must be equal to the design pressure. Take a good look at the standards and you’ll know.
For 150: Operating pressure ≤ design pressure. Sealing test pressure = design pressure. The air pressure is approximately 1.15 times the design pressure (there is a stress value for comparison); for details, please refer to 150~
The design pressure is indicated on both the drawings from our company and those from the design institute
The airtightness test is slightly above the operating pressure and below the design pressure; the air pressure is 1.15 times the design pressure
The air pressure is 1.15 times the design pressure, while the airtightness test pressure is equal to the design pressure. What does the air pressure mentioned earlier refer to?
The design pressure refers to the maximum pressure specified at the top of the container; together with the corresponding design temperature, it serves as the design load condition, and its value is not lower than the operating pressure. Working pressure refers to the highest pressure that may be reached at the top of the container under normal operating conditions. The test pressure for a hydrostatic test is equal to 1.25 times the design pressure ×/t. The test pressure for a pneumatic test is equal to 1.15 times the design pressure ×/t. Note: t: the allowable stress of the material at the design temperature. : Allowable stress of the material at the test temperature. When the materials used for various components (cylinders, nozzles, flanges) are different, the minimum value of /t is taken.