Pipeline testing
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I would like to ask: if the design pressure for the pipeline is 1.76 MPa and water is used for pressure testing, is it acceptable to choose valves with a pressure rating of 2.5 MPa?
Sure, the pipeline pressure test is carried out at 1.5 times the working pressure. What is the working pressure of your pipeline?
The design pressure for the pipeline is 1.76 MPa; it is recommended to use valves with a pressure rating of 4.0 MPa, one level higher
It cannot be determined rashly; it mainly depends on the operating temperature of your pipeline. The allowable stress of materials varies at different temperatures. The coefficient for the hydrostatic test pressure relative to the design pressure is not simply 1.5 times the design pressure as is commonly assumed. At normal temperatures, 1.5 can be used as a reference, but when the design temperature is high, the ratio of the allowable stress at 20°C to the allowable stress at the operating temperature becomes quite large. For specific requirements, refer to section 10.3 of GB50517-10
The working pressure is 1.6 MPa
The operating pressure of the pipeline is 1.6 MPa; it is a jet fuel pipeline at normal temperature
At normal temperature, a design pressure of 1.5 times is sufficient
At normal temperature, a design pressure of 1.5 times is sufficient
For valves, it is sufficient to choose a grade that is one higher than the design pressure of the pipeline.