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GB/T 38942-2020Pressure piping code - Utility piping (English PDF)

压力管道规范公用管道

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

June 2, 2020

Implementation date

January 1, 2021

Scope

GB/T 38942-2020 is the English-translated version of 压力管道规范公用管道.

GB/T 38942-2020 is the Chinese standard "Pressure piping code - Utility piping". Its scope clause reads: This standard specifies the safety-related basic requirements for materials, design and calculation, manufacture and installation, inspection and test, safe operation and maintenance of utility piping (gas piping and heat piping).

This standard is applicable to the following urban gas piping and urban heat piping: a) Gas piping: utility gas piping and ancillary facilities from gas plants or stations such as gate station, storage and distribution station and various gas source plants or stations to users or between plants/stations, with the ancillary facilities including line valve chamber, pressure regulating station (including pressure regulating box), condenser cylinder, etc., see Figure 1 for details. b) Heat piping: steam piping and hot water piping and their ancillary facilities laid in cities and towns from the demarcation point of heat source outlet to the demarcation point of heat user (civil or industrial) inlet, see Figure 2 for details.

Of them the medium design pressure is less than or equal to 2.5 MPa for both steam and hot water and the design temperature is less than or equal to 350°C for steam or less than or equal to 200°C for hot water.

This standard is not applicable to the following gas piping and heat piping: a) The gas piping in the plant or station (except the pressure regulating station) in the gas system and the heat piping in the plant or station (except the heat station and the heat distribution station) in the heat system; b) Internal gas piping and heat piping for industrial users (divided by plant boundaries); c) Internal gas piping (divided by building service pipe valve) and heat piping (divided by heat inlet) for commercial and residential users; d) Internal piping of gas and heat equipment.

Keys: Piping systems to which this standard applies Scope beyond the application scope of this standard Valve chambers and pressure regulating stations (including pressure regulating boxes) covered by this standard GB/T 34275 shall be implemented for the gas piping between the distribution station and the gate station.

If the gas piping is laid in the built-up area of the city, this standard may be referred to for implementation.

Figure 1 Scope of gas piping system to which this standard applies Keys: Piping systems to which this standard applies Scope beyond the application scope of this standard Shaft chambers, heat stations and heat distribution stations covered by this standard Figure 2 Scope of heat piping system to which this standard applies. Its clauses include terms and definitions.

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Document preview — GB/T 38942-2020

National Standard of the People's Republic of China

ICS: 23.040
Classification: J 74

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Materials
5 Design and calculation
6 Manufacture and installation
7 Inspections and tests
8 Safe operation and maintenance
Annex A (Normative) Performance parameters of plastic piping for thermal use
Annex B (Normative) Performance parameters of commonly-used steel pipes
Bibliography

1 Scope

1.1

This standard specifies the safety-related basic requirements for materials, design and calculation, manufacture and installation, inspection and test, safe operation and maintenance of utility piping (gas piping and heat piping).

1.2

This standard is applicable to the following urban gas piping and urban heat piping:

a) Gas piping: utility gas piping and ancillary facilities from gas plants or stations such as gate station, storage and distribution station and various gas source plants or stations to users or between plants/stations, with the ancillary facilities including line valve chamber, pressure regulating station (including pressure regulating box), condenser cylinder, etc., see Figure 1 for details.

b) Heat piping: steam piping and hot water piping and their ancillary facilities laid in cities and towns from the demarcation point of heat source outlet to the demarcation point of heat user (civil or industrial) inlet, see Figure 2 for details. Of them the medium design pressure is less than or equal to 2.5 MPa for both steam and hot water and the design temperature is less than or equal to 350°C for steam or less than or equal to 200°C for hot water.

1.3

This standard is not applicable to the following gas piping and heat piping:

a) The gas piping in the plant or station (except the pressure regulating station) in the gas system and the heat piping in the plant or station (except the heat station and the heat distribution station) in the heat system;

b) Internal gas piping and heat piping for industrial users (divided by plant boundaries);

c) Internal gas piping (divided by building service pipe valve) and heat piping (divided by heat inlet) for commercial and residential users;

d) Internal piping of gas and heat equipment.

Keys:

Piping systems to which this standard applies

Scope beyond the application scope of this standard

Valve chambers and pressure regulating stations (including pressure regulating boxes) covered by this standard

GB/T 34275 shall be implemented for the gas piping between the distribution station and the gate station. If the gas piping is laid in the built-up area of the city, this standard may be referred to for implementation.

Figure 1 Scope of gas piping system to which this standard applies

Keys:

Piping systems to which this standard applies

Scope beyond the application scope of this standard

Shaft chambers, heat stations and heat distribution stations covered by this standard

Figure 2 Scope of heat piping system to which this standard applies

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 150 (All parts) Pressure vessels

GB/T 229 Metallic materials - Charpy pendulum impact test method

GB/T 1048 Pipework components - Definition and selection of nominal pressure

GB/T 2518 Continuously hot-dip zinc and zinc alloy coated steel sheet and strip

GB/T 3091 Welded steel pipes for low pressure liquid delivery

GB/T 3280 Cold rolled stainless steel plate, sheet and strip

GB/T 3880 (All parts) Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering

GB/T 4622.1 Classification for spiral wound gaskets

GB/T 4622.2 Dimensions for spiral wound gaskets for pipe flanges

GB/T 4622.3 Specification of spiral wound gaskets

GB/T 8163 Seamless steel pipes for liquid service

GB 8624 Classification for burning behavior of building materials and products

GB/T 8923.1 Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings

GB/T 9124.1 Steel pipe flanges - Part 1: PN designated

GB/T 9124.2 Steel pipe flanges - Part 2: Class designated

GB/T 9125 Fasteners for steel pipe flange joints

GB/T 9711 Petroleum and natural gas industries - Steel pipe for pipeline transportation systems

GB/T 10699 Calcium silicate thermal insulation products

GB/T 11835 Rock wool, slag wool and it's products for thermal insulation

GB/T 12234 Bolted bonnet steel gate valves for petroleum and natural gas industries

GB/T 12235 Steel globe valves and lift check valve for petroleum, petrochemical and allied industries

GB/T 12241 Safety valves - General requirements

GB/T 12242 Performance test code - Pressure relief devices

GB/T 12243 Spring loaded safety valves

GB/T 12459 Steel buttwelding pipe fittings - Types and parameter

GB/T 12754 Prepainted steel sheet and strip

GB/T 12777 General specification for metal bellows expansion joints

GB/T 13295 Ductile iron pipes, fittings and accessories for water or gas applications

GB/T 13350 Glass wool and its products for thermal insulation

GB/T 13401 Steel buttwelding pipe fittings - Technical specification

GB/T 13402 Large diameter steel pipe flanges

GB/T 13403 Gaskets for large-diameter steel pipe flanges

GB/T 15558.1 Buried polyethylene (PE) piping systems for the supply of gaseous fuels - Part 1: Pipes

GB/T 15558.2 Buried polyethylene (PE) piping systems for the supply of gaseous fuels - Part 2: Fittings

GB/T 15558.3 Buried polyethylene (PE) piping systems for the supply of gaseous fuels - Part 3: Valves

GB/T 17116.1 Pipe supports and hangers - Part1: Technical specification

GB/T 17116.2 Pipe supports and hangers - Part 2: Pipe attachments

GB/T 17116.3 Pipe supports and hangers - Part 3: Middle connection attachments and building structure attachments

GB/T 17794 Preformed flexible elastomeric cellular thermal insulation

GB/T 19285 Inspection of corrosion protection for buried steel pipelines

GB/T 19292.1 Corrosion of metals and alloys - Corrosivity of atmospheres - Part 1: Classification, determination and estimation

GB/T 19326 Forged branch outlet fittings, socket-welding, threaded and buttwelding

GB/T 19473.1 Polybutene (PB) piping systems for hot and cold water installations - Part 1: General

GB/T 19473.2 Polybutene (PB) piping systems for hot and cold water installations - Part 2: Pipes

GB/T 19473.3 Polybutene (PB) piping systems for hot and cold water installations - Part 3: Fittings

GB/T 20801 (All parts) Pressure piping code - Industrial piping

GB/T 21447 Specifications for steel pipeline external corrosion control

GB/T 21448 Specification of cathodic protection for underground steel pipelines

GB/T 23257 Polyethylene coating for buried steel pipeline

GB/T 25775 Technical delivery conditions for welding consumables - Type of product dimensions tolerances and markings

GB/T 25778 Procurement guidelines for welding consumables

GB 26255.1 Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels - Part 1: Metal fittings for pipes of nominal outside diameter less than or equal to 63 mm

GB 26255.2 Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels - Part 2: Metal fittings for pipes of nominal outside diameter greater than 63 mm

GB/T 28799.1 Plastics piping systems for hot and cold water installations - Polyethylene of raised temperature resistance (PE-RT) - Part 1: General

GB/T 28799.2 Plastics piping systems for hot and cold water installations - Polyethylene of raised temperature resistance (PE-RT) - Part 2: Pipes

GB/T 28799.3 Plastics piping systems for hot and cold water installations - Polyethylene of raised temperature resistance (PE-RT) - Part 3: Fittings

GB/T 29047 Prefabricated directly buried insulating pipes and fittings with polyurethane foamed-plastics and high density polyethylene casing pipes

GB/T 29168.1 Petroleum and natural gas industries - Induction bends, fittings and flanges for pipeline transportation systems - Part 1: Induction bends

GB/T 29168.2 Petroleum and natural gas industries - Induction bends, fittings and flanges for pipeline transportation systems - Part 2: Fittings

GB/T 29461 Ultrasonic testing for electrofusion joint of polyethylene pipe

GB/T 29639 Guidelines for enterprises to develop emergency response plan for work place accidents

GB/T 32270-2015 Pressure piping code - Power piping

GB/T 32563 Non-destructive testing - Ultrasonic testing - Test method for phased-array ultrasonic testing

GB/T 34275 Pressure piping code - Long-distance pipeline

GB/T 34336 Nano-pore aerogel composite thermal insulation products

GB/T 34611 Rigid polyurethane spray polyethylene winding prefabricated directly buried insulating pipes

GB/T 35842 Technical requirements for pre-insulated directly buried valve of urban heating

GB/T 35979 Technical specification for selection, installation, use and maintenance of metal bellows expansion joints

GB/T 35990 Metal bellows expansion joints for pressure piping

GB/T 37190 Pipeline corrosion control engineering life cycle - General requirements

GB/T 37228 Societal security - Emergency management - Requirements for incident response

GB/T 37261 Ball joint compensator for district heating system

GB/T 37263 Prefabricated directly buried insulating plastic-steel-plastic composite pipes with polyurethane (PUR) foamed-plastics and high density polyethylene (PE) casing pipes

GB/T 37369 Inspection and assessment of crossing and aerial crossing of buried steel pipelines

GB/T 37827 Welded ball valve for urban heating

GB/T 37828 Bidirectional metal to metal sealed butterfly valve for urban heating

GB/T 38097 Urban heating - Prefabricated directly buried insulating pipes and fittings with polyurethane (PUR) foamed-plastics and glass fiber reinforced plastics protect layers

GB/T 38105 Urban heating - Steel jacket prefabricated directly buried pipes and fittings with vacuum insulating layers

GB/T 38343 Technical specification for flange joints installation

GB 50016 Code for fire protection design of buildings

GB 50028 Code for design of city gas engineering

GB 50032 Code for seismic design of outdoor water supply sewerage gas and heating engineering

GB 50052 Code for design electric power supply systems

GB 50057 Design code for protection of structures against lightning

GB 50086 Technical code for engineering of ground anchoring and shotcrete support

GB 50201-2012 Code for construction and acceptance of earthwork and blasting engineering

GB 50235 Code for construction of industrial metallic piping engineering

GB 50236 Code for construction of field equipment, industrial pipe welding engineering

GB 50251-2015 Code for design of gas transmission pipeline engineering

GB 50264 Code for design of industrial equipment and pipeline insulation engineering

GB 50369 Code for construction and acceptance of oil & gas transmission pipeline engineering

GB 50423 Code for design of oil and gas transportation pipeline crossing engineering

GB 50460 Code for construction of oil and gas transmission pipeline aerial crossing engineering

GB/T 50470 Seismic technical code for oil and gas transmission pipeline engineering

GB 50494 Technical code for city gas

GB 50683-2011 Code for acceptance of field equipment, industrial pipe welding construction quality

GB/T 50698 Standard for AC interference mitigation of buried steel pipelines

GB 50764-2012 Design code of power of piping for power plant

GB 50779 Code for design of blast resistant control building in petrochemical industry

GB/T 50811 Standard for the operation safety assessment of gas system

GB 50838 Technical code for urban utility tunnel engineering

GB 50991 Technical standard for DC interference mitigation of buried steel pipeline

GB/T 51098 Code for planning of city gas

GB/T 51241 Technical code for field joint coatings of pipeline

GBZ/T 205 Specification of prevention and control on occupational hazards in confined space

CJ/T 246 Preformed directly buried steam insulating pipes and fittings for urban heating

CJ/T 402 Bellows expansion joints for city heating pipeline

CJ/T 480 Prefabricated directly buried composite insulating pipes with polyurethane (PUR) foamed-plastics and high density polyethylene (PE) casing pipes

CJ/T 487 Sleeve expansion joint for district heating system

CJJ 28-2014 Code for construction and acceptance of city heating pipelines

CJJ 34 Design code for city heating network

CJJ 63 Technical standard for polyethylene (PE) gaseous fuel pipeline engineering

CJJ/T 81 Technical specification for directly buried hot-water heating pipeline in city

CJJ 88 Technical specification for operation and maintenance of city heating system

CJJ 95 Technical specification for external corrosion control of buried steel pipeline for city gas

CJJ/T 104 Technical specification for directly buried steam heating pipeline in city

CJJ/T 153 Standard for city gas signs

CJJ 203 Technical specification for emergency repair of district heating system

CJJ/T 220 Standard for city heating system signs

CJJ/T 250 Technical specification for crossing and aerial crossing engineering of city gas pipeline

CJJ/T 254 Technical specification for leakage surveillance system of directly buried heating pipe

DB 31/T 1058 Phased array ultrasonic testing for welding joint of polyethylene (PE) pipe

DL/T 5072 Code for designing insulation and painting of power plant

HG/T 3707 Fittings of perforated steel skeleton polyethylene composite pipes for industry

HG/T 3831 Spray polyurea for materials protection

HG/T 20592 Steel pipe flanges (PN designated)

HG/T 20606 Non-metallic flat gaskets for use with steel pipe flanges (PN designated)

HG/T 20607 PTFE envelope gaskets for use with steel pipe flanges (PN designated)

HG/T 20609 Metal jacketed gaskets for use with steel pipe flanges (PN designated)

HG/T 20610 Spiral wound gaskets for use with steel pipe flanges (PN designated)

HG/T 20611 Covered serrated metal gaskets for use with steel pipe flanges (PN designated)

HG/T 20612 Metallic ring joint gaskets for use with steel pipe flanges (PN designated)

HG/T 20613 Bolting for use with steel pipe flanges (PN designated)

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1 utility piping

gas piping and heat piping for public utilities or civil use in cities or towns, with gas piping of Class GB1 and heat piping of Class GB2

3.2 design pressure

pressure used to determine the wall thickness of the piping at the corresponding design temperature, which shall not be smaller than the maximum working pressure of the piping

3.3 design temperature

temperature set for element with the piping under normal conditions

Note: The design temperature and design pressure together serve as the design condition.

3.4 design working life

service life during which the engineering facilities can be used for the intended purpose only by normal maintenance without overhaul within a specified period

3.5 stress analysis

verification of ability of the piping to absorb displacement deformation caused by thermal expansion, cold contraction and others through its own deformation by stress calculation

3.6 pipe laying with elastic bending

way of piping laying by virtue of elastic bending deformation of piping caused by external force or dead weight

3.7 utility tunnel

structures and ancillary facilities built underground in cities to accommodate two or more types of urban engineering pipelines

3.8 gas

generic term for gaseous fuels

Note: Urban gas generally includes natural gas, liquefied petroleum gas and artificial gas.

3.9 gas displacement

process of displacing the air in the piping with gas after the construction or repair of the gas piping is completed

3.10 gas conversion

process of converting one kind of gas into another due to some reason of the gas piping

3.11 building service pipe

piping between the outdoor gas distribution branch pipe and the main valve of the user's indoor gas inlet pipe (or the height 1.0 m above the indoor floor if there is no valve)

3.12 pipe fittings

generic term for various special-shaped connectors on piping such as elbows, bends, tees, reducing joints and pipe seal heads […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 70 pages — is available in the English PDF.

Similar standards

GB/T 19285-2026|GB/T 20801.1-2025|GB/T 20801.5-2025|GB/T 32270-2024|GB/T 34275-2024|GB/T 47414-2026

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