Pressure vessels are designed in accordance with ASME; what are the special requirements for pressure testing them?

For pressure vessels designed in accordance with ASME, special requirements for hydrostatic testing include ensuring that the test pressure is typically 1.1 to 1.5 times the design pressure； Use dry, oil-free air or an inert gas as the testing medium ； During the testing process, the outside of the container is carefully inspected to check for any leaks or deformation ； Ensure that the safety valve and all connections are properly installed and remain sealed. At the same time, strict safety measures must be followed during the testing process to ensure the safety of the operators. .

The test pressure is set at 1.1 times the MAWP*LSR; otherwise, it follows the national standards with no special requirements

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See UG-100; the test pressure must be 1.1 times or greater than the MAWP； Pneumatic testing can be used as a substitute for hydraulic testing in situations where filling the container with water is unsafe, drying it out is not feasible, and it is not allowed to have any residual testing fluid left ； The metal temperature is maintained 17 degrees above the minimum design temperature℃ ； Pressure increment, visual inspection, paint layers, and so on ；

In addition to meeting all the requirements of UG-100, containers that undergo pressure testing shall be subjected to non-destructive testing in accordance with UW-50.

When conducting pneumatic testing on pressure vessels designed in accordance with ASME standards, the following specific requirements must be taken into account: 1. **Selection of test pressure**: Generally, the pressure for pneumatic testing should be 1.1 to 1.5 times the design pressure; the exact factor depends on the design of the vessel and the materials used. Ensure that the test pressure does not exceed the yield limit of the container material. 2. **Temperature control**: The test temperature should be appropriate; testing at extremely low or high temperatures should be avoided, as such extreme conditions can affect the mechanical properties and sealing performance of the material. 3. **Environmental safety**: Due to the high compressibility of gases, the risk of leaks or explosions is greater; therefore, tests must be conducted under strict safety measures. Ensure that all safety valves and pressure relief devices are in good working condition. 4. **Detecting leaks**: Use appropriate detection methods to locate the source of leaks, such as checking welds and joints with soapy water, or employing more modern electronic gas detectors for detection. 5. **Recording and Monitoring**: A detailed record of the entire testing process should be kept, including pressure values, temperature, and time, while the monitoring system must operate continuously to ensure data accuracy. 6. **Gradual pressure increase**: During testing, the pressure should be increased gradually to avoid sudden increases, thereby preventing damage to the container or system components. 7. **Post-test inspection**: A thorough inspection should be carried out after the test is completed, including a visual check of both the inside and outside of the container, to ensure that there are no structural damages or declines in performance. 8. **Compliance with standards**: Ensure that all testing procedures and operations meet the requirements of ASME and relevant regulations. It is essential to pay attention to safety when conducting pressure tests, and to follow the relevant standards and regulations strictly. .