1.1 GB/T 20801 specifies the basic requirements for the design, fabrication, assembly, inspection, testing and safeguarding of industrial metal pressure piping.
1.2 This part of GB/T 20801 specifies the basic requirements for pressure piping, such as application scope and piping grading.
1.3 The industrial metal pressure piping (hereinafter referred to as “pressure piping”) in this part includes the pressure piping for process devices, auxiliary devices and utility works within the battery limit.
This part is applicable to the piping with the following conditions:
a) The pressure piping with the maximum working pressure greater than or equal to 0.1MPa (gauge pressure) and a nominal diameter greater than or equal to 50mm, for which the medium may be gas, liquefied gas, steam or flammable, explosive, toxic and corrosive liquid with the maximum working temperature greater than or equal to the standard boiling point. The piping and equipment piping with a nominal diameter less than 150mm and the maximum working pressure less than 1.6MPa (gauge pressure) for conveying non-toxic, nonflammable and non-corrosive gases is excluded.
b) Pressure piping other than those listed in 1.5.
1.4 The exclusion scope of this part is as follows:
a) special requirements for reconstruction, examination, inspection, test, maintenance and repair of in-service pressure piping;
b) piping with a nominal pressure greater than PN420;
c) non-metal piping or lining layers thereof.
1.5 The non-application scope of this part is as follows:
a) piping of military equipment and nuclear facilities;
b) piping of exploration and excavation devices for petroleum, natural gas, terrestrial heat, etc.;
c) pressure piping of mobile equipment such as railway locomotives, automobiles, ships and aerospace vehicles;
d) Type GA long-distance piping;
e) Type GB utility piping;
f) Type GCD power piping;
g) internal piping of boilers, pressure vessels and heating furnaces as well as external piping orifices of equipment;
h) piping with a design pressure less than 0.1MPa (gauge pressure) and not less than atmospheric pressure for conveying non-toxic, non-flammable and non-corrosive fluids.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 20801.2 pressure piping code - Industrial piping - Part 2: Materials
GB/T 20801.3 Pressure piping code - Industrial piping - Part 3: Design and calculation
GB/T 20801.4 Pressure piping code - Industrial piping - Part 4: Fabrication and assembly
GB/T 20801.5 Pressure piping code - Industrial piping - Part 5: Inspection and testing
GB/T 20801.6 Pressure piping code - Industrial piping - Part 6: Safeguarding
GB 30000 (All parts) Rules for classification and labeling of chemicals
GB 50016-2014 Code for fire protection design of buildings
GB 50160-2008 Fire prevention code of petrochemical enterprise design
Catalogue of hazardous chemicals (2015)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 20801.2, GB/T 20801.3, GB/T 20801.4, GB/T 20801.5, GB/T 20801.6 and the following apply.
3.1
piping
system assembled by piping components for conveying, distributing, mixing, separating, discharging, metering or stopping fluid flow
Note: besides the piping components, it also includes pipe-supporting elements, but does not include supporting structures, such as building frame, pipe support, pipe gallery and base (pipe pier or foundation), etc.
GB/T 20801.1-2020 The following standards are cited：
