3.8 MPa, 450°C superheated steam hydrostatic test pressure
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The superheated steam conditions are 3.8 MPa and 450 degrees Celsius; the design pressure has been set at 4.2 MPa. The material 15CrMoG is chosen, with a grade of PN63. However, calculations show that the hydrostatic test pressure would need to be 9.3 MPa, which is far above the specified material grade. I would like to know how the hydrostatic test pressure should be determined.
In my opinion, it is acceptable to calculate the hydrostatic test pressure at 9.3 MPa; however, it is also necessary to ensure that the circumferential pressure of the components under test conditions does not exceed the specified value, otherwise the test pressure needs to be reduced.