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See Chinese contents: GB/T 20801.1-2020 GB/T 20801.1-2020: Pressure piping code -- Industrial piping -- Part 1: General
GB/T 20801 specifies the basic requirements for the design, fabrication, assembly, inspection, testing and safeguarding of industrial metal pressure piping. This Part of GB/T 20801 specifies the basic requirements for pressure piping, such as: the scope of application and the classification of piping.
