According to ASME B31.3 "K323.3.4 Test Temperatures", test temperature of impact test shall not be higher than "the lowest temperature at which a piping component or weld will be subjected to a stress greater than 41 MPa (6ksi)" . To know this temperature, I must know the behavior of the system, the designer must give me this data to be able to realize my WPS that includes the test CHARPY.
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