I would like to ask how the pressure for testing this steam pipe should be determined
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Steam usage pressure: 0.6 MPa, temperature: 250°C, superheated steam, thank you
As shown in the figure, refer to GB/T 20801 for details on the hydraulic and pneumatic test pressures
For this pipeline, it is recommended to conduct a hydrostatic test. The information you provided is insufficient, so an answer cannot be given (such as the pipe material). It is recommended that you carry out the calculations by yourself in accordance with the provisions of 8.6.4.5 of the \"GB 50235-2010 Code for Construction of Industrial Metal Piping Projects\". For your reference
Thank you very much for your reply. I would like to ask further: under these current circumstances, how is the design pressure determined?
Thank you very much for your reply. The issue with the test pressure has been resolved. Based on your experience, what conditions do you think are still missing? I would like to ask further: under these current circumstances, how is the design pressure determined?
How is the design pressure determined? For steam, if the system is equipped with a safety valve and its set pressure is 0.6 MPa, then the design pressure is based on the set pressure of that safety valve； If there is no safety valve, the highest pressure that the steam supplied to the system can reach serves as the design pressure ； The maximum operating temperature can be used as the design temperature. For the determination of design pressure and design temperature, you may refer to Section 3.1 Design Conditions of the \"GB 50316-2000 (2008 Edition) Code for Design of Industrial Metal Piping\". The allowable stress of different pipe materials varies at different temperatures. If the pipe material is 20 steel. The design pressure is based on the use of a safety valve; the allowable stress for 20-grade steel at room temperature is 137 MPa, and it is 132 MPa at 250°C. The hydrostatic test pressure is: P = 1.5 × 0.6 × (137/132) = 0.934 MPa. This is provided for your reference.
Issues related to the design of pressure pipelines can be found in GB20801.
Determining the design pressure and temperature is quite crucial