What pressure should be set when the pipeline is pressure-resistant and airtight? ?
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After the pipeline installation is completed, pressure tests and airtightness tests must be carried out. May I ask, what values should be used for the pressure resistance and airtightness pressures? How many times is it the working pressure of the pipeline? Or several times the design pressure of the pipeline? Are the multiples for gas pipes the same as those for liquid pipes? Which specification specifies this clearly? Thank you
This is a novel question: the airtightness test for pressure vessels = design pressure. I’m not sure if the pipeline and equipment, when connected together, also operate at the design pressure.
The water pressure should be 1.25 times, and the airtightness should be 1.1
1. After the pipeline installation is completed, a pressure resistance test must be carried out. 1.1. For vacuum pipelines, the pressure used in the test is 0.2 MPa. 1.2. The pressure for liquid pipeline tests is 1.5 times the design pressure. 1.3. The pressure for gas pipeline tests is 1.15 times the design pressure. 2. If the design temperature is higher than the test temperature, the test pressure needs to be adjusted. 3. Pipelines of different pressure grades should be tested in segments. 4. There are numerous pipeline standards; for pipelines that are flammable or explosive, the Sinopec standard is SH3501
Refer to Section 8.6.4 of the GB50235 Code for Construction of Industrial Metal Piping Projects to answer your question: 6 When the piping and equipment are tested as a single system, and the test pressure for the piping is equal to or less than that of the equipment, the testing shall be carried out at the test pressure of the piping； When the test pressure for the pipeline is higher than that of the equipment, and it is not possible to separate the pipeline from the equipment, or when the test pressure of the equipment is greater than 77% of the pipeline’s test pressure calculated according to equation (8.6.4), testing may be carried out at the equipment’s test pressure, with the approval of the designer or the project owner.