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This standard corresponds to ISO 15649: 2001 "Petroleum and Natural Gas Industries - Piping", and has an un-equivalent conformance with ISO 15649: 2001.
The standard GB/T 20801 "Pressure Piping Code - Industrial Piping" consists of six parts:
——Part 1: General;
——Part 2: Materials;
——Part 3: Design and calculation
——Part 4: Fabrication and assembly;
——Part 5: Inspection and testing;
——Part 6: Safeguarding
This part is Part 1 of GB/T 20801.
This Part is proposed by the Piping Subcommittee of the National Technical Committee on Boiler Pressure Vessel of Standardization Administration of China (SAC/TC 262/SC 3). This Part is under the jurisdiction of National Technical Committee on Boiler Pressure Vessel of Standardization Administration of China (SAC/TC 262).
Drafting organizations: National Technology Center of Process Equipment, SINOPEC Shanghai Engineering Co., Ltd., ShanghaiChem Engineering Incorporation, Bureau of Safety Supervision of Special Equipment under the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China (GAQSIQ), SINOPEC Economics & Development Research Institute, SINOPEC Engineering Construction Management Department, Liaoning Safety Science Institute
Chief drafting staffs: Xia Dekai, Ying Daoyan, Liu Ansheng, Gao Jixuan, Xiu Changzheng, Wang Zhen'an, Ye Wenbang, Shou Binan, Wang Weiguo, Huang Zhenglin, Zhou Jiaxiang, Tang Yongjin, Zhang Baojaing, Yu Puyi, Liu Jinshan
Pressure Piping Code - Industrial Piping
Part 1: General
1 Scope
1.1 GB/T 20801 "Pressure Piping Code - Industrial Piping" specifies the basic requirements for design, fabrication, erection, inspection, and safeguarding of industrial metal pressure piping.
1.2 This Part specifies the basic requirements in application scope and classification of pressure piping.
1.3 The industrial metal pressure piping (hereinafter referred to as "pressure piping") this Part applies includes ones in processing equipment, ancillary equipment, and public works within battery limit.
1.3.1 This Part is applicable to the design and construction of "pressure piping" "Regulations on Safety Supervision for Special" Equipment applies. The "pressure piping" specified in this part refers to pipes with the nominal diameter larger than 25mm, which is used for gas and vapor media with the maximum working pressure is greater than or equal to 0.1 MPa, or combustible, explosive, noxious and corrosive liquid media with the maximum working temperature is higher or equal to the normal boiling point.
1.3.2 This part is also applicable to the design and fabrication of fluid pressure piping which nominal diameter is close to or equal to 25mm and the maximum working pressure is under 0.1 MPa, or vacuum, noncombustible, innoxious and non-corrosive fluid pressure piping.
1.4 This part is not applicable to:
a) Piping with the nominal pressure higher than PN420;
b) Piping for military equipment or nuclear facility;
c) Piping for prospecting and excavation felicities of petroleum, natural gas and geothermal heat;
d) Piping for offshore facility or coal mine pit;
e) Piping special to electrical or telecommunication felicities;
f) Pressure piping for mobile equipments like rail engine, automobile, vessel, aeri-/ space-craft;
g) Piping for urban public utility;
h) Long-distance (oil / gas) piping and oil / gas field gathering piping;
i) Internal piping or equipment external piping orifice for prototype equipment (like pump and compressor), or other liquid delivery or processing equipment;
j) Professional piping for heating and ventilation;
k) Special pressure piping, like diversion piping and headrace, for hydraulic power plant; or
l) Power piping.
1.5 This part doesn't cover the requirements in-service pressure piping, examination, inspection, test, maintenance and repairing.
2 Normative References
Provisions of the following documents constitute some provisions of this part of GB/T 20801 through reference. For dated references, all subsequent modification or revision (excluding correction contents) are not applicable to this Part. However, all concerned Parties are encouraged to study if the latest editions of these documents can be applied. For undated references, the latest editions of the normative documents are applicable to this part.
GB/T 1047-2005 Pipework components - Definition and selection of DN (nominal size)
GB/T 1048-2005 Pipework components - Definition and selection of nominal pressure (PN)
GB 5044-1985 Classification of health hazard levels from occupational exposure to toxic substances
GB/T 20801.2-2006 pressure piping code - Industrial piping - Part 2: Materials
GB/T 20801.3-2006 Pressure piping code - Industrial piping - Part 3: Design and calculation
GB/T 20801.4-2006 Pressure piping code - Industrial piping - Part 4: Fabrication and assembly
GB/T 20801.5-2006 Pressure piping code - Industrial piping - Part 5: Inspection and testing
GB/T 20801.6-2006 Pressure piping code - Industrial piping - Part 6: Safeguarding
GB 50016-2006 Code for fire protection design of buildings
GB 50160-1992 Fire prevention code of petrochemical enterprise design
3 Terms and Definitions
3.1
Piping
It is assembled by piping components, used for delivery, distribution, mixing, separating, discharging, metering or flow cut-off. Besides piping components, piping includes piping supporting elements, excluding supporting structure like building frame, pipe support, pipe rack and base (pipe pier or foundation).
3.2
Nominal pressure (PN)
It consists of letters PN and non-dimensional integral number according to the definition given by GB/T1048, to represent the pressure rating of piping component.
3.3
Nominal diameter (DN)
It consists of letters DN and non-dimensional integral number according to the definition given by GB/T1047, to represent the detailed specification of piping component.
3.4
Pipe
Sealed hollow continuum used to delivery liquid or pass on liquid pressure.
3.5
Piping components
Mechanical components used to connect or assemble to sealed pressure piping system, including pipe, pipe fittings, flange, gasket ring, fastening piece, valve, safety protection system, expansion joint, flexible joint, pressure hose, filter, pipe meter (like orifice plate), and disconnector.
3.6
Pipe-supporting elements
Components transfer the following loads to the pipe support structure: weight of pipes and delivered liquid, load due to operating pressure and differential temperature, and loads caused by wind force, seismic shock, snow load, impact and displacement strain. It comes with fixtures and structural attachments.
Fixtures include suspension fixtures, like suspension rod, spring hanger, diagonal member, hammer, turnburkle, support bar, link chain, guide and attachment frame, and load-bearing fixtures like saddle seat, rolling column, bracket and sliding feet.
Structural attachments refer to components attached onto piping by welding, bolted connection or clamping, like lifting eye, pipe anchor, snap ring, pipe clip, U-clamp and clamp plate.
3.7
Fittings
A type of piping component, generally including elbow, T joint, reducing pipe, pipe cap, flanging nipple and movable joint.
3.8
Pipe support
Structure to support the piping, to which the load and thrust force are transferred through supporting pieces. A pipe support is consisted of steel or reinforced-concrete column/ transverse member or frame; it can be fixed on foundation independently, or on equipment or wall. It comes with single-column type, double-column type and cantilever type.
3.9
Pipe rack
It refers to a key place in which large-scale piping is laid, and it is consisted of steel / reinforced-concrete colum, transverse member and truss. It comes with single-layer or multiple-layer, and passable or non-passable ones.
3.10
Toxic medium
General name of media with extreme, high, and moderate hazard defined in GB 5044.
3.11
Combustible medium or flammable medium
General name of Class A and B liquids and ones with the working temperature higher than the flashing point, defined in GB 50160 and GB 50016.
4 Classification of pressure piping
The hazard rating and safty level of the pressure piping is divided into GC1, GC2 and GC3.
4.1 The pressure piping under one of the following conditions refers to GC1:
4.1.1 Pressure piping to delivery the following toxic medium:
A) Extremely hazard medium;
B) High hazard gas medium; and
C) High hazard liquid medium with the working temperature higher than the normal boiling point.
4.1.2 Pressure piping to delivery the following combustible medium or flammable medium, and with the design pressure greater than or equal to 4.0 MPa:
A) Class A and B combustible gas;
B) Liquefied hydrocarbon; and
C) Class Ib flammable liquid.
4.1.3 Pressure piping with the design pressure greater than or equal to 10.0 MPa, and ones with the design pressure greater than or equal to 4.0 MPa and the design temperature greater than or equal to 400℃
——Part 1: General;
——Part 2: Materials;
——Part 3: Design and calculation
——Part 4: Fabrication and assembly;
——Part 5: Inspection and testing;
——Part 6: Safeguarding
