How is the pressure rating of steam pipes determined
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How are the low, medium, and high pressures for steam pipes determined?
Classification of pressure pipeline grades: Low-pressure pipelines have a nominal pressure not exceeding 2.5 MPa. Medium-pressure pipelines with a nominal pressure of 4–6.4 MPa. High-pressure pipelines with a nominal pressure of 10–100 MPa. Ultra-high pressure pipelines have a nominal pressure exceeding 100 MPa. Public pipelines are of GB category, with the following grades: GB1, gas pipelines ； GB2, thermal pipelines.
High-pressure and medium-pressure steam are superheated and used as power steam. Low vapor pressure is generally used as the heat source for a reboiler
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Is there any source for this claim?