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GB/T 26081-2022Ductile iron pipes, fittings and accessories for sewerage applications (English PDF)

排水工程用球墨铸铁管、管件和附件

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

October 12, 2022

Implementation date

October 12, 2022

Scope

GB/T 26081-2022 is the English-translated version of 排水工程用球墨铸铁管、管件和附件.

GB/T 26081-2022 is the Chinese standard "Ductile iron pipes, fittings and accessories for sewerage applications".

Its scope clause reads: This document specifies the requirements for ductile iron pipes, fittings and accessories for external drainage works of buildings produced by any casting process or processing Technical requirements, performance requirements, testing methods, type tests, inspection rules, marks, quality certificates and dimension tables, etc. This document applies to those containing sockets, spigots or flanges, generally delivered in the internal and external coated state, the size range is nominal diameter DN80~DN3000 ductile iron pipes, pipe fittings (hereinafter referred to as "pipes" and "pipe fittings") and accessories, the scope of application is as follows. ---Operate under no pressure, positive pressure or negative pressure; ---Installed on the ground or underground; ---Split transport or combined transport of rainwater, sewage, and certain types of industrial wastewater.

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Document preview — GB/T 26081-2022

National Standard of the People's Republic of China

ICS: 23.040.10; 23.040.40
Classification: H 48
Replacing: GB/T 26081-2010

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Technical requirements
4.1 General
4.2 Classification of pipelines
4.3 Size
4.4 Inspection well
4.5 Material properties
4.6 External coating and lining
4.7 Sealing requirements
5 Performance requirements
5.1 Flexible interface tightness
5.2 The tightness of the well chamber
5.3 Longitudinal flexural strength of pipe
5.4 Radial stiffness of tubes
5.5 Chemical resistance
5.6 Wear resistance
6 Detection method
6.1 Size
6.2 Straightness of tubes
6.3 Tensile test
6.4 Brinell hardness
6.5 Factory leak test for pipes and fittings
6.6 Surface quality
7 Type test
7.1 Tightness of flexible interface
7.2 The tightness of the well chamber
7.3 Longitudinal flexural strength
7.4 Radial stiffness
7.5 Chemical resistance
7.6 Abrasion resistance
8 Inspection rules
8.1 Inspection and acceptance
8.2 Batch rules
8.3 Sample size
9 Identification and Quality Certificate
9.1 Identification
9.2 Quality certificate
10 Size table
10.1 Socket tube
10.2 Fittings
Appendix A (informative) The comparison between this document and the ISO 7186.2011 structure number
Appendix B (informative) Technical differences between this document and ISO 7186.2011 and their reasons
Appendix C (informative) allowable pressure
Appendix D (informative) Dimensions of pressure grade pipes
Appendix E (Normative) Wall Thickness, Radial Stiffness and Radial Deformation of Tubes
Appendix F (informative) External anti-corrosion
Appendix G (Normative) Identification method of aluminate cement mortar lining
Appendix H (Informative) Internal Anticorrosion
Appendix I (informative) safety factor
Appendix J (Normative) Quality Assurance
Appendix K (informative) On-site inspection and acceptance

1 Scope

This document specifies the requirements for ductile iron pipes, fittings and accessories for external drainage works of buildings produced by any casting process or processing

Technical requirements, performance requirements, testing methods, type tests, inspection rules, marks, quality certificates and dimension tables, etc.

This document applies to those containing sockets, spigots or flanges, generally delivered in the internal and external coated state, the size range is nominal diameter

DN80~DN3000 ductile iron pipes, pipe fittings (hereinafter referred to as "pipes" and "pipe fittings") and accessories, the scope of application is as follows.

---Operate under no pressure, positive pressure or negative pressure;

---Installed on the ground or underground;

---Split transport or combined transport of rainwater, sewage, and certain types of industrial wastewater.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 41-2016 Type 1 hex nuts, grade C (ISO 4034.2012, MOD)

GB/T 201 aluminate cement

GB/T 205 Aluminate cement chemical analysis method

GB/T 228.1 Tensile tests on metallic materials - Part 1.Test methods at room temperature (GB/T 228.1-2021, ISO 6892-1.

2019, MOD)

GB/T 231.1 Brinell hardness test for metallic materials - Part 1.Test method (GB/T 231.1-2018, ISO 6506-1.

2014, MOD)

GB/T 2988-2012 high alumina brick

GB/T 5780-2016 Hexagon head bolts, grade C (ISO 4016.2011, MOD)

GB/T 13295 Ductile iron pipes, fittings and accessories for water and gas (GB/T 13295-2019, ISO 2531.2009, MOD)

GB/T 17241.6 integral cast iron flange

GB/T 17456.1 Zinc coating on the outer surface of ductile iron pipes Part 1.Metallic zinc coating with finishing layer (GB/T 17456.1-

2009, ISO 8179-1.2004, IDT)

GB/T 17456.2 Zinc coating on the outer surface of ductile iron pipes Part 2.Zinc-rich paint coating with finishing layer (GB/T 17456.2-

2010, ISO 8179-2.1995, MOD)

GB/T 17457 Ductile iron pipes and fittings cement mortar lining (GB/T 17457-2019, ISO 4179.2005, MOD)

GB/T 17671 Test method for cement mortar strength (ISO method) (GB/T 17671-2021, ISO 679.2009, MOD)

GB/T 21873 Specifications for materials of rubber seals for water supply, drainage pipes and sewage pipes (GB/T 21873-

2008, ISO 4633.2002, MOD)

GB/T 23858 inspection manhole cover

GB/T 36173 Design regulations and type tests for self-anchoring interface systems for ductile iron pipelines (GB/T 36173-2018,

ISO 10804.2010, MOD)

GB/T 50125 Basic Terminology Standards for Water Supply and Sewerage Engineering

GB/T 24187 | GB/T 24591 | GB/T 24593 | GB/T 13295 | GB/T 12772 | […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 125 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 4034.2012 · ISO 6892 · ISO 6506 · ISO 4016.2011 · ISO 2531.2009 · ISO 8179 · ISO 4179.2005 · ISO 679.2009 · ISO 4633.2002 · ISO 10804.2010

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