On the allowable stress of pipes
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I wonder how people take into account the allowable stress of pipes when selecting the wall thickness of those pipes. For example, for seamless steel pipes specified in GB8163, with a design temperature of normal temperature and a design pressure of 6.0 MPa, should the wall thickness be chosen according to the Sch series, with the allowable stress considered to be 245 MPa or 130 MPa?
The stress level is selected based on temperature; for the same steel pipe, the higher the temperature, the lower the stress level. If the requirements are not met, a steel pipe of a higher grade must be chosen.
Generally, based on the conditions mentioned above, how is the pipe wall thickness calculated?