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See Chinese contents: GB/T 20801.4-2020 GB/T 20801.4-2020: Pressure piping code - Industrial piping - Part 4: Fabrication and assembly
This Part of GB/T 20801 specifies the basic requirements for the fabrication and assembly of pressure piping. These basic requirements include regulations on fabrication, welding, preheating, heat treatment, assembly, erection and piping cleaning, etc. This Part is applicable to the fabrication and assembly of pressure pipework components defined in the scope of GB/T 20801.1.
