GB
National Standard of the People's Republic of China
GB/T 20801.1-2006
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< p>Pressure piping code — Industrial piping —Part 1: GeneralReleased on 2006-12-30 Implemented on 2007-06-01
Published by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration
Pressure piping specifications for industrial piping
Part 1: General provisions
1 Scope
1.1 GB/T 20801 "Pressure piping specifications for industrial piping" stipulates Basic requirements for the design, installation, inspection and safety protection of industrial metal pressure pipelines.
1.2 This section specifies the basic requirements such as the scope of application of pressure pipelines and pipeline classification.
1.3 The industrial metal pressure pipelines (hereinafter referred to as "pressure pipelines") referred to in this section include process equipment, auxiliary equipment, and pressure pipelines belonging to public works within the boundary.
1.3.1 This section applies to the design and construction of "pressure pipelines" stipulated in the "Special Equipment Safety Supervision Regulations". The "pressure pipeline" stipulated in this regulation refers to gas, liquefied, steam media with a maximum working pressure greater than or equal to 0.1MPa or flammable, explosive, toxic, corrosive liquid media with a maximum working temperature higher than or equal to the standard boiling point. And pipes with a nominal diameter greater than 25mm.
1.3.2 This section also applies to the design and construction of pressure pipelines with a nominal diameter close to or equal to 25mm, a maximum working pressure less than 0.1MPa or vacuum, non-flammable, non-toxic and non-corrosive liquid pressure pipelines.
1.4 This section does not apply to the following scope:
a) Pipes with a nominal pressure above PN420;
b) Pipes for military equipment and nuclear facilities;
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c) Pipelines for oil, natural gas, geothermal and other exploration and mining equipment;
d) Pipelines for offshore facilities and coal mines;
e) Electrical and telecommunications special Pipes;
f) Pressure pipes on mobile equipment such as railway locomotives, automobiles, ships, aerospace vehicles, etc.;
g) Urban and municipal utility pipes;
h) Long-distance (oil and gas) pipelines and oil and gas field gathering and transportation pipelines;
i) Internal pipelines of stereotyped equipment such as pumps, compressors and other equipment for transporting or processing liquids, as well as external pipe connections of equipment;
j) Professional pipes for heating and ventilation;
k) Special pressure pipes for hydropower stations, such as water diversion pipes, aqueducts, etc.;
l) Power pipes.
1.5 This section does not include requirements for in-service pressure piping, inspection, inspection, testing, maintenance and repair.
2 Normative reference documents
The provisions in the following documents become the provisions of this part through the reference of this part of GB/T 20801. For dated reference documents, all subsequent amendments (excluding corrigenda) or revisions do not apply to this section. However, parties to an agreement based on this section are encouraged to study whether the latest versions of these documents can be used. . For undated referenced documents, the latest version applies to this section.
GB/T 1047-2005 Definition and selection of DN (nominal size) of piping components
GB/T 1048-2005 Definition and selection of PN (nominal pressure) of piping components
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GB 5044-1985 Classification of Hazards from Occupational Exposure to Toxins
GB/T 20801.2-2006 Pressure Pipe Specification Industrial Pipes Part 2: Materials
GB/T 20801.3 -2006 Pressure Piping Specification for Industrial Piping Part 3: Design and Calculation
GB/T 20801.4-2006 Pressure Piping Specification for Industrial Piping Part 4: Fabrication and Installation
GB/T 20801.5 -2006 Specification for pressure piping, industrial piping, Part 5: Inspection and testing
GB/T 20801.6-2006 Specification for pressure piping, industrial piping, Part 6: Safety protection
GB 50016-2006 Construction Design Fire Protection Code
GB 50160-1992 Design Fire Protection Code for Petrochemical Enterprises
3 Terms and Definitions
3.1
Piping piping
p>Assembled from piping components and used to convey, distribute, mix, meter or stop flow. In addition to pipe components, pipes also include pipe supports, but do not include supporting structures such as building frames, pipe racks, pipe galleries, and bases (pipe piers or foundations).
3.2
Nominal pressure (PN) nominal pressure
According to the definition of GB/T1048, it consists of the letters PN and dimensionless integer numbers, representing the composition of the pipeline The pressure level of the parts.
3.3
Nominal diameter (DN) nominal diameter
According to the definition of GB/T 1047, it consists of the letters DN and a dimensionless integer number, representing the pipe Specifications of component parts.
3.4
Pipe, tube
A sealed hollow continuous body used to transport liquid or transmit liquid pressure.
3.5
Piping components
Mechanical components of piping systems used to connect or assemble into pressure seals, including pipes, fittings, flanges, gaskets sheets, fasteners, valves, safety protection devices, as well as expansion joints, flexible joints, pressure-resistant hoses, filters, instruments in the pipeline (such as orifice plates) and separators, etc.
3.6
Pipe-supporting elements
It is the load of the pipeline, including the weight of the pipeline, the weight of the transported liquid, the operating pressure and the temperature difference. Loads and loads caused by wind, earthquake, snow load, impact and displacement strain are transmitted to the elements of the pipe frame structure. It is divided into two categories: fixtures and structural attachments.
Fixed parts include suspension fixtures such as booms, spring hangers, tie rods, hammers, elastic bolts, support rods, chains, guide rails and fixed frames, as well as load-bearing fixtures such as saddles , rollers, brackets and sliding bearings, etc.
Structural accessories refer to components on the pipeline that are attached by welding, bolting or clamping methods, such as lifting lugs, pipe hangers, snap rings, pipe clamps, U-shaped clamps and splints, etc.
3.7
Pipe fittings
A category of pipe components, usually including elbows, tees, reducers, pipe caps, flanged nipples and unions, etc.
3.8
Pipe support pipe support
is a structure that supports pipelines. Pipes transmit load and thrust to the pipe rack through supports. The pipe frame is composed of columns, beams or frames of steel structure or reinforced concrete structure. It can be independently fixed on the basis or fixed on the equipment or wall. According to the type, there are: single-column type, double-column type and cantilever type.
3.9
Pipe rack
refers to the main place for road construction and laying of large-scale installation pipelines. It consists of steel structure or reinforced concrete structure, beams and Made of trusses. According to the type, it can be divided into single layer or multi-layer, accessible or inaccessible, etc.
3.10
Toxic medium toxic medium
refers to the general term for extremely, highly and moderately hazardous media defined in GB 5044.
3.11
Combustible medium or flammable medium
Refers to Category A, B and high working temperature defined according to GB 50160 and GB 50016 A general term for fluids with a flash point.
4 Pressure pipeline classification
Pressure pipelines are divided into three levels: GC1, GC2 and GC3 according to their degree of hazard and safety level.
4.1 Pressure pipelines that meet one of the following conditions should be classified as GC1:
4.1.1 Pressure pipelines transporting the following toxic media:
a) Extreme Hazardous media;
b) Highly hazardous gas media;
c) Highly hazardous liquid media with working temperatures higher than the standard boiling point.
4.1.2 Pressure pipelines transporting the following flammable and explosive media with a design pressure greater than or equal to 4.0MPa:
a) Class A and B flammable gases;
< p> b) Liquefied hydrocarbons;c) Class A and B flammable liquids.
4.1.3 Pressure pipes with a design pressure greater than or equal to 10.0MPa and pressure pipes with a design pressure greater than or equal to 4.0MPa and a design temperature greater than or equal to 400°C.
4.2 Pressure pipelines that meet the following conditions are classified as GC2:
Except for GC3 pipelines specified in Article 4.3, medium toxicity, fire hazard (flammability), design pressure and pressure pipelines with design temperatures lower than those specified in Article 4.1 (GC1 grade).
4.3 Pressure pipelines that meet the following conditions should be classified as GC3:
Transportation, non-flammable fluid media, design pressure close to or equal to 1.0MPa and design temperature greater than -20℃ but not Pressure pipelines above 185℃.
4.4 When transporting mixed media with different toxicity or flammability, the owner or designer should determine the grade of the pressure pipeline according to its degree of hazard and content.
5 Basic requirements
5.1 The construction materials of pressure pipelines should comply with the regulations of GB/T 20801.2-2006.
5.2 The design and calculation of pressure pipelines should comply with the regulations of GB/T 0801.3-2006.
5.3 The production and installation of pressure pipelines should comply with the regulations of GB/T 0801.4-2006.
5.4 The inspection and testing of pressure pipelines should comply with the regulations of GB/T 20801.5-2006.
5.5 The safety protection of pressure pipelines should comply with the regulations of GB/T 20801.6-2006.