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GB/T 20801.1-2020 (GB/T20801.1-2020)

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GB/T 20801.1-2020: PDF in English (GBT 20801.1-2020)
GB/T 20801.1-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.040
J 74
Replacing GB/T 20801.1-2006
Pressure Piping Code - Industrial Piping -
Part 1: General
ISSUED ON: MARCH 6, 2020
IMPLEMENTED ON: OCTOBER 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 6 
3 Terms and Definitions ... 7 
4 Classification of Pressure Piping ... 9 
5 Basic Requirements ... 10 
Appendix A (normative) Classification of Medium Toxicity and Flammability in
Pressure Piping ... 11 
Pressure Piping Code - Industrial Piping -
Part 1: General
1 Scope
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: the scope of application and the classification of piping.
1.3 In this Part, industrial metal pressure piping (hereinafter referred to as “pressure
piping”) includes pressure piping for process equipment, auxiliary equipment and
public works within the boundary.
This Part is applicable to piping under the following conditions:
a) Pressure piping: the maximum working pressure is greater than or equal to
0.1 MPa (gauge pressure); the medium is gas, liquefied gas, steam, or
combustible, explosive, toxic and corrosive liquid whose maximum working
temperature is higher than or equal to the standard boiling point; the nominal
diameter is greater than or equal to 50 mm. Except for piping whose nominal
diameter is less than 150 mm, the maximum working pressure is less than 1.6
MPa (gauge pressure), and transports non-toxic, non-flammable, non-
corrosive gases and piping that belongs to the equipment body.
b) Pressure piping other than those listed in 1.5.
1.4 This Part does not include the following scopes:
a) Special requirements for the renovation, examination, inspection, testing,
maintenance and repair of in-service pressure piping;
b) Piping whose nominal pressure is above PN420;
c) Non-metallic piping or its lining layer.
1.5 The inapplicable scope of this Part is as follows:
a) Piping for military equipment and nuclear facilities;
b) Piping for exploration and mining equipment of petroleum, natural gas and
3 Terms and Definitions
What is defined in GB/T 20801.2, GB/T 20801.3, GB/T 20801.4, GB/T 20801.5 and
GB/T 20801.6, and the following terms and definitions are applicable to this document.
3.1 Piping
Piping refers to a system that is assembled from piping components, and used for
conveying, distributing, mixing, separating, discharging, metering or cutting off fluid
flow.
NOTE: in addition to piping components, it also includes pipe-supporting elements, but
does not include supporting structures, such as: building frames, pipe racks, pipe
galleries and bases (pipe piers or foundations), etc.
3.2 Nominal Pressure; PN
Nominal pressure refers to a parameter consisting of the letters PN and a
dimensionless integer number, which represents the pressure level of the piping
component.
3.3 Nominal Diameter; DN
Nominal diameter refers to a parameter consisting of the letters DN and a
dimensionless integer number, which represents the specification of the piping
component.
3.4 Pipe; Tube
Pipe (tube) refers to a sealed hollow continuum used to convey fluids or transfer fluid
pressure.
3.5 Piping Component
Piping component refers to a mechanical component used to connect or assemble into
a piping system with sealed pressure.
NOTE: it includes pressure piping components (pipe, pipe fitting, valve, flange,
compensator, sealing component, special component), safety accessories (safety
valve, bursting disc device, emergency cut-off valve), as well as fasteners, flame
arresters, expansion joints, flexible joints, pressure hoses, filters, instruments (for
example, orifice plate) in pipelines and separators, etc.
3.6 Pipe-supporting Element
Pipe-supporting element refers to an element that is used to transfer piping load,
including the weight of piping, the weight of conveying fluid, the load caused by
hydrocarbons); classified in accordance with the flash point and boiling point. See
Appendix A for details.
3.12 Gas
In addition to the definition in 3.10, the “gas” involved in the scope of GB/T 20801 also
includes steam, liquefied gas, liquids whose maximum working temperature is higher
than or equal to the standard boiling point, as well as two-phase or multi-phase fluid
media, including the gas phase.
4 Classification of Pressure Piping
4.1 In accordance with the extent of hazards and the safety level, the “pressure piping”
listed in 1.3 a) is divided into Level-GC1 and Level-GC2:
a) Pressure piping that complies with one of the following conditions shall be
divided as Level-GC1:
1) Pressure piping that conveys Acute Toxicity Category 1 medium, Acute
Toxicity Category 2 gas medium, and Acute Toxicity Category 2 liquid
medium whose working temperature is higher than its standard boiling
point, as specified in the “Catalog of Hazardous Chemicals (version
2015)”.
2) Pressure piping that conveys fire hazard First-Class and Second-Class
flammable gas, or First-Class flammable liquid (including liquefied
hydrocarbon) as specified in GB 50160-2008 and GB 50016-2014, and
with the design pressure greater than or equal to 4.0 MPa.
3) Pressure piping that conveys fluids other than the first two media, and
with the design pressure greater than or equal to 10.0 MPa, or, with the
design pressure greater than or equal to 4.0 MPa, and the design
temperature greater than or equal to 400 °C.
b) Pressure piping that complies with the following condition shall be divided as
Level-GC2:
Pressure piping whose medium toxicity or flammability hazard and extent of
hazards, design pressure and design temperature are lower than the
stipulations of 4.1 a) (Level-GC1).
4.2 Pressure piping that is listed in 1.3 b) and complies with the following condition
shall be divided as Level-GC3:
Pressure piping that conveys non-toxic, non-flammable, non-corrosive liquid media,
and with the design pressure of less than or equal to 1.0 MPa, and design temperature
Appendix A
(Normative)
Classification of Medium Toxicity and Flammability in Pressure
Piping
A.1 General Regulations
A.1.1 The hazards, the extent of hazards, the classification principle and definition of
media in pressure piping are determined on the basis of the stipulations of GB 50160-
2008, GB 50016-2014, “Catalog of Hazardous Chemicals (version 2015)” and GB
30000.
A.1.2 The hazard of media refers to the extent of health hazard and safety hazard
caused by the contact between the media and the human body due to accidental
leakage during the production and storage process. It is expressed by the toxicity and
flammability of the media. The division of the extent of hazards and dangers shall be
respectively determined in accordance with the stipulations of A.2 and A.3.
A.1.3 A chemical medium might have multiple types of hazards and dangers, which
shall be respectively evaluated in accordance with GB 30000.2 ~ GB 30000.29, so as
to determine the extent of hazards and dangers (the higher one shall be subject to).
A.1.4 The hazardous chemicals listed in A.2 and A.3, and their mixtures shall be
considered as toxic and flammable hazardous media.
A.2 Flammability
A.2.1 Flammable gas
In accordance with the stipulations of GB 50160-2008 and GB 50016-2014, the
classification of flammable gases involved in pressure piping is shown in Table A.1.
Table A.1 -- Flammable Gas
Name Category Criterion
GB 50160-
2008
Flammable
Gas
First The lower explosive limit of the mixture with the air is not more than 10% (volume fraction)
Second The lower explosive limit of the mixture with the air is more than or equal to 10% (volume fraction)
A.2.2 Flammable liquid
In accordance with the stipulations of GB 50160-2008 and GB 50016-2014, the
......
 
(Above excerpt was released on 2020-08-02, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT20801.1-2020