GB/T 20801.1-2020 English PDF (GBT20801.1-2020)

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GB/T 20801.1-2020: Pressure Piping Code - Industrial Piping - Part 1: General
GB/T 20801.1-2020
Pressure piping code--Industrial piping--Part 1. General
ICS 23.040
J74
National Standards of People's Republic of China
Replace GB/T 20801.1-2006
Pressure Pipeline Specification Industrial Pipeline
Part 1. General
Released on 2020-03-06
2020-10-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Contents
Foreword Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 2
4 Pressure piping classification 3
5 Basic requirements 3
Appendix A (Normative Appendix) Classification of Toxicity and Flammability of Media in Pressure Piping 4
Foreword
GB/T 20801 "Pressure Piping Specification Industrial Pipeline" is divided into the following 6 parts.
--- Part 1. General Provisions;
--- Part 2. Materials;
--- Part 3. Design and calculation;
--- Part 4. Production and Installation;
--- Part 5. Inspection and testing;
--- Part 6. Security protection.
This part is Part 1 of GB/T 20801.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 20801.1-2006 "Pressure Piping Code Industrial Pipe Part 1. General Rules", and
Compared with GB/T 20801.1-2006, except for editorial changes, the main technical changes are as follows.
--- According to the catalog of special equipment, the scope of application of the standard was modified [see 1.3a),.2006 version 1.3.1];
--- Adopt the exclusion method and amend the scope of application of the standard [see 1.3b),.2006 version 1.3.2];
--- Modified the scope of non-applicability and exclusion of the standard (see 1.4, 1.5, 1.4 and 1.5 in the.2006 edition);
--- Modified the definition of piping components used in this section (see 3.5, 3.5 in the.2006 edition);
--- Revised the definition of medium hazard (see 3.9, 3.10, 3.11,.2006 edition 3.10, 3.11);
--- Added the definition of "gas" (see 3.12);
--- According to the relevant administrative license, revised the division of pressure pipelines GC1, GC2, GC3 (see 4.1, 4.2,.2006 edition 4.1,
4.2, 4.3);
--- Added "Classification of medium toxicity and flammability in pressure pipes" (see Appendix A).
This part is proposed and managed by the National Boiler and Pressure Vessel Standardization Technical Committee (SAC/TC262).
This section was drafted by. National Chemical Equipment Design and Technology Center Station, Special Equipment Safety Supervision Bureau of the State Administration for Market Supervision and Administration, Shanghai
Haishi Special Equipment Supervision and Inspection Technology Research Institute.
The main drafters of this section. Cai Nuanshu, Ying Daoyan, Xu Feng, Huang Zhenglin, Tang Xiaoying.
The previous versions of the standard replaced by this part are as follows.
--- GB/T 20801.1-2006.
Pressure Pipeline Specification Industrial Pipeline
Part 1. General
1 Scope
1.1 GB/T 20801 specifies the basic requirements for the design, manufacture, installation, inspection, testing and safety protection of industrial metal pressure pipes.
1.2 This part of GB/T 20801 stipulates the basic requirements for the scope of application of pressure pipes and pipe classification.
1.3 The industrial metal pressure pipelines referred to in this section (hereinafter referred to as "pressure pipelines") include process devices, auxiliary devices and public
The pressure pipe to which the project belongs.
This section applies to the following conditions of the pipeline.
a) The maximum working pressure is greater than or equal to 0.1MPa (gauge pressure), the medium is gas, liquefied gas, steam or combustible, explosive, toxic,
Corrosive liquid with a maximum working temperature higher than or equal to the standard boiling point, and a pressure tube with a nominal diameter greater than or equal to 50mm
Road. The nominal diameter is less than 150mm, and the maximum working pressure is less than 1.6MPa (gauge pressure), which is non-toxic, non-flammable and non-corrosive
Except for the corrosive gas pipeline and the pipeline to which the equipment body belongs.
b) Pressure piping other than those listed in 1.5.
1.4 The scope of this part does not include the following.
a) Special requirements for renovation, inspection, inspection, testing, maintenance and repair of in-service pressure pipelines;
b) Pipes with a nominal pressure above PN420;
c) Non-metallic piping or its lining.
1.5 The scope of this part does not apply as follows.
a) Pipelines of military equipment and nuclear facilities;
b) Pipelines for exploration and extraction equipment such as oil, natural gas, and geothermal;
c) Pressure pipes on mobile equipment such as railway locomotives, automobiles, ships, aerospace vehicles, etc .;
d) GA long-distance pipeline;
e) GB type public pipeline;
f) GCD power pipeline;
g) Internal pipes of boilers, pressure vessels and heating furnaces and external nozzles of equipment;
h) A pipeline with a design pressure lower than 0.1 MPa (gauge pressure) but not lower than atmospheric pressure to transport non-toxic, non-flammable, non-corrosive fluids
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.
GB/T 20801.2 Pressure Pipeline Specification Industrial Pipeline Part 2. Materials
GB/T 20801.3 Pressure Pipeline Specification Industrial Pipeline Part 3. Design and Calculation
GB/T 20801.4 Pressure Pipeline Specification Industrial Pipeline Part 4. Production and Installation
GB/T 20801.5 Pressure Pipeline Specification Industrial Pipeline Part 5. Inspection and Test
GB/T 20801.6 Pressure Pipeline Specification Industrial Pipeline Part 6. Safety Protection
GB 30000 (all parts) Chemical classification and labeling specifications
GB 50016-2014 Fire Code for Building Design
GB 50160-2008 Design Fire Standard for Petrochemical Enterprises
Hazardous Chemicals Catalog (2015 version)
3 Terms and definitions
GB/T 20801.2, GB/T 20801.3, GB/T 20801.4, GB/T 20801.5 and GB/T 20801.6 as defined and the following operations
Terms and definitions apply to this document.
3.1
pipeline
A system that is assembled from piping components and used to transport, distribute, mix, separate, discharge, meter, or shut off fluid flow.
Note. In addition to pipeline components, it also includes pipeline supports, but does not include supporting structures such as building frames, pipe racks, pipe corridors and bases (pipe piers or foundations).
3.2
Nominal pressure
Composed of letters PN and dimensionless integer numbers, it represents the parameters of the pressure rating of the pipeline components.
3.3
Nominal diameter
Composed of letters DN and dimensionless integer numbers, it represents the parameters of the specifications of the pipeline components.
3.4
tube
A sealed hollow continuum used to transport fluid or transfer fluid pressure.
3.5
Pipeline components
Used for connecting or assembling mechanical components of pressure-tight piping system.
Note. Including pressure piping components (pipes, fittings, valves, flanges, compensators, sealing components, special components), safety accessories (safety valves, rupture disc devices, emergency
Shut-off valve), and such as fasteners, flame arresters, expansion joints, flexible joints, pressure hoses, filters, instruments in the pipeline (such as orifice plates) and separators.
3.6
Pipe support
It is used to load the pipeline, including the pipeline's own weight, the weight of the conveyed fluid, the load caused by the operating pressure and temperature difference, and vibration,
Loads caused by wind, earthquake, snow load, impact and displacement strain are transferred to the pipe frame structure.
Note 1. Pipe support is divided into two types of fixed parts and structural accessories.
Note 2. The fixing parts include hanging fixing parts such as suspension rods, spring hangers, diagonal rods, counterweights, elastic bolts, support rods, chains, guide rails and fixing brackets, and bearings
Carrier type fixing parts, such as saddle, base, roller, bracket and sliding support.
Note 3. Structural accessories refer to the components attached to the pipeline by welding, bolting or clamping methods, such as lugs, pipe cranes, snap rings, pipe clamps, U-shaped clamps and splints.
3.7
Pipe fittings
A category of pipeline components, usually including elbows, tees, tees, elbows, reducers, pipe caps, flanging joints and unions.
3.8
Pipe rack
The structure used to support the pipeline.
Note 1. The pipeline transmits the load and thrust to the pipe frame through the support.
Note 2. The pipe frame is composed of steel structure or reinforced concrete structure columns, beams or frames, independently fixed on the foundation, can also be fixed on the equipment or on the wall.
Note 3. There are single column type, double column type and cantilever type by type.
3.9
Acute toxicity
Toxicity index of chemicals (medium) causing human death by one-time exposure. Press its LD50 (oral, percutaneous) or LC50 (inhalation 4h)
The half of the lethal dose is classified as the degree of harm, see Appendix A for details.
3.10
flammable gas
At 20 ℃ and 101.3kPa standard pressure, mixed with air has a certain explosive (flammable) gas range, see Appendix A for details.
3.11
Flammable liquid
Liquids with a certain flash point (including liquefied hydrocarbons) are classified according to their flash point and boiling point, see Appendix A for details.
3.12
gas
In addition to the definition of 3.10, the "gas" involved in the scope of GB/T 20801 also includes steam, liquefied gas, and the maximum working temperature is higher than or
Liquid equal to standard boiling point and two-phase or multi-phase fluid medium including gas phase.
4 Pressure pipeline classification
4.1 The "pressure pipes" listed in 1.3a) are classified into GC1 and GC2 according to their hazard degree and safety level.
a) Pressure pipes that meet one of the following conditions should be classified as GC1.
1) The degree of toxicity specified in the Catalog of Hazardous Chemicals (2015 Edition) is acute toxicity category 1 medium, acute toxicity category
Do not 2 gas media and pressure pipes with acute toxicity category 2 liquid media whose working temperature is higher than its standard boiling point.
2) The fire hazard specified in GB 50160-2008 and GB 50016-2014 is Class A, B combustible gas or Class A
Combustible liquids (including liquefied hydrocarbons) and pressure pipes with a design pressure greater than or equal to 4.0 MPa.
3) Transport fluid other than the first two media, and the design pressure is greater than or equal to 10.0MPa, or the design pressure is greater than or
Pressure pipes equal to 4.0 MPa and with a design temperature higher than or equal to 400 ° C.
b) Pressure pipes (including refrigeration pipes) that meet the following conditions should be classified as GC2.
Pressure pipes with medium toxicity or flammability danger and hazard level, design pressure and design temperature lower than those specified in 4.1a) (GC1 level).
4.2 Pressure pipes listed in 1.3b) and meeting the following conditions shall be classified as GC3.
Transport non-toxic, non-flammable, non-corrosive liquid medium, design pressure is less than or equal to 1.0MPa and design temperature is higher than -20 ℃
Pressure pipes above 185 ° C.
Note. GC3 pipelines are not applicable to the pressure pipelines listed in 1.3a).
4.3 When transporting mixed media with different levels of toxicity or flammability hazards and hazards, the pressure shall be determined by the owner or the design in accordance with the provisions of Appendix A.
Power pipeline rating.
5 Basic requirements
5.1 The construction materials of the pressure pipeline shall comply with the provisions of GB/T 20801.2.
5.2 The design and calculation of pressure piping shall comply with the provisions of GB/T 20801.3.
5.3 The manufacture and installation of pressure pipes shall comply with the provisions of GB/T 20801.4.
5.4 The inspection and test of pressure pipes shall comply with the provisions of GB/T 20801.5.
5.5 The safety protection of pressure pipes shall comply with the provisions of GB/T 20801.6.
Appendix A
(Normative appendix)
Classification of medium toxicity and flammability in pressure pipes
A.1 General provisions
A.1.1 The hazard and danger degree, classification principle and definition of the medium in the pressure pipeline are based on GB 50160-2008, GB 50016-
2014, "Hazardous Chemicals Inventory (2015 Edition)" and GB 30000 regulations were determined on the basis.
A.1.2 Media hazards refer to health hazards caused by media contact with humans and fires caused by accidental leakage during production and storage
The degree of harm and safety hazard is expressed by the toxicity and flammability of the medium. The division of hazards and dangers is in accordance with the provisions of A.2 and A.3, respectively
determine.
A.1.3 A chemical medium may have multiple hazards and types of hazards, which should be evaluated according to GB 30000.2 ~ GB 30000.29
Estimate and determine the degree of hazard or danger, whichever is higher.
A.1.4 The hazardous chemicals and their mixtures listed in A.2 and A.3 shall be regarded as toxic and flammable hazardous media.
A.2 Flammability
A.2.1 Flammable gas
According to the provisions of GB 50160-2008 and GB 50016-2014, the classification of combustible gases involved in pressure piping is shown in Table A.1.
Table A.1 Combustible gases
Name category criterion
GB 50160-2008 combustible gas
The lower explosion limit of the mixture with air is not more than 10% (volume fraction)
The lower explosion limit of the mixture with air is greater than or equal to 10% (volume fraction)
A.2.2 Flammable liquid
According to the provisions of GB 50160-2008 and GB 50016-2014, the classification of flammable liquids involved in pressure piping is shown in Table A.2.
Table A.2 Flammable liquid
Name category criterion
GB 5016...