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GB/T 26081-2022: Ductile iron pipes, fittings and accessories for sewerage applications
Status: Valid GB/T 26081: Evolution and historical versions
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Basic data | Standard ID | GB/T 26081-2022 (GB/T26081-2022) | | Description (Translated English) | Ductile iron pipes, fittings and accessories for sewerage applications | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H48 | | Classification of International Standard | 23.040.10; 23.040.40 | | Word Count Estimation | 74,731 | | Date of Issue | 2022-10-12 | | Date of Implementation | 2022-10-12 | | Older Standard (superseded by this standard) | GB/T 26081-2010 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 26081-2022: Ductile iron pipes, fittings and accessories for sewerage applications---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Ductile iron pipes, fittings and accessories for sewerage applications
ICS 23.040.10;23.040.40
CCSH48
National Standards of People's Republic of China
Replacing GB/T 26081-2010
Ductile iron pipes, fittings and accessories for drainage works
Released on 2022-10-12
2022-10-12 Implementation
State Administration for Market Regulation
Released by the National Standardization Management Committee
table of contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 2
4 Technical requirements 6
4.1 General 6
4.2 Classification of pipelines 7
4.3 Size 8
4.4 Inspection well 11
4.5 Material properties 13
4.6 External coating and lining 14
4.7 Sealing requirements 16
5 Performance requirements 17
5.1 Flexible interface tightness 17
5.2 The tightness of the well chamber 18
5.3 Longitudinal flexural strength of pipe 18
5.4 Radial stiffness of tubes 19
5.5 Chemical resistance 21
5.6 Wear resistance 21
6 Detection method 21
6.1 Size 21
6.2 Straightness of tubes 22
6.3 Tensile test 22
6.4 Brinell hardness 24
6.5 Factory leak test for pipes and fittings 24
6.6 Surface quality 25
7 Type test 25
7.1 Tightness of flexible interface 25
7.2 The tightness of the well chamber 27
7.3 Longitudinal flexural strength 27
7.4 Radial stiffness 27
7.5 Chemical resistance 28
7.6 Abrasion resistance 29
8 Inspection rules 29
8.1 Inspection and acceptance 29
8.2 Batch rules 29
8.3 Sample size 29
9 Identification and Quality Certificate 30
9.1 Identification 30
9.2 Quality certificate 30
10 Size table 30
10.1 Socket tube 30
10.2 Fittings 31
Appendix A (informative) The comparison between this document and the ISO 7186.2011 structure number 43
Appendix B (informative) Technical differences between this document and ISO 7186.2011 and their reasons 48
Appendix C (informative) allowable pressure 53
Appendix D (informative) Dimensions of pressure grade pipes 54
Appendix E (Normative) Wall Thickness, Radial Stiffness and Radial Deformation of Tubes 56
E.1 General 56
E.2 Radial stiffness and radial deformation 56
Appendix F (informative) External anti-corrosion 60
Appendix G (Normative) Identification method of aluminate cement mortar lining 61
G.1 Method A 61
G.2 Method B 61
Appendix H (Informative) Internal Anticorrosion 62
Appendix I (informative) safety factor 64
Appendix J (Normative) Quality Assurance 65
J.1 General 65
J.2 Type test 65
J.3 Quality control 65
Appendix K (informative) On-site inspection and acceptance 66
K.1 General 66
K.2 Inspection and acceptance items and requirements Clause 66
K.3 Judgment and re-inspection rules 66
Reference 67
foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents"
drafting.
This document replaces GB/T 26081-2010 "Ductile Iron Pipes, Fittings and Accessories for Sewage". Compared with GB/T 26081-2010, except
Apart from structural adjustments and editorial changes, the main technical changes are as follows.
--- Increased and changed the description of some terms and definitions (see Chapter 3, Chapter 3 of the.2010 edition);
---Change the specified upper limit of the nominal diameter of the pipeline from DN2600 to DN3000, and add the relevant specifications of DN2800 and DN3000
Technical requirements (see 4.1.1.2, 4.1 of the.2010 edition);
--- Added the technical requirements for grading pipes according to their wall thickness (see 4.2.1);
---Changed the corresponding specification range of the preferred pressure level, and basically ensured that the wall thickness of the pipe in this document is consistent with ISO 7186 and
Harmonization of GB/T 13295 (see 4.2.5, 5.1.4 of the.2010 edition);
--- Deleted the technical requirements for gravity flow tubes (see 5.1 of the.2010 edition);
---Changed the zinc coating weight requirements for pressure rating pipes in low-corrosion environment (see 4.6.2.1, 6.2.2.1 of the.2010 edition);
--- Added the requirement that aluminate cement mortar lining should be used for conveying sewage, and added the identification method of aluminate cement mortar lining
Law (see 4.6.3.1 and Appendix G);
--- Added the requirements for the seal type test of the interface under cyclic pressure (see 5.1.5);
--- Increased inspection well structure, size requirements and test methods (see 4.4, 6.5.1.3 and 10.2.7).
This document is modified to adopt ISO 7186.2011 "Ductile Iron Products for Drainage Engineering".
Compared with ISO 7186.2011, this document has more structural adjustments. For the comparison list of structural number changes between the two documents, see
Appendix A.
Compared with ISO 7186.2011, this document has more technical differences, and vertical single
Lines (|) are marked. See Appendix B for a list of these technical differences and their causes.
The following editorial changes have been made to this document.
---Modify the name of the standard to "Ductile Iron Pipes, Fittings and Accessories for Drainage Engineering";
--- Added Appendix C (informative) allowable pressure;
--- Increased the size of the pressure grade pipe in Appendix D (informative);
--- Changed Appendix F (informative) external anti-corrosion;
--- Changed the internal anti-corrosion of Appendix H (informative);
--- Added Appendix I (informative) safety factor;
--- Added Appendix K (informative) on-site inspection and acceptance.
Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents.
This document is proposed by China Iron and Steel Industry Association.
This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This document is drafted by. Xinxing Cast Pipe Co., Ltd., Saint-Gobain Pipeline System Co., Ltd., Guoming Cast Pipe Co., Ltd., Metallurgy
Industrial Information Standard Research Institute, Angang Group Yongtong Ductile Iron Pipe Co., Ltd., Xinxing Hebei Engineering Technology Co., Ltd.
The main drafters of this document. Shen Yong, Wang Song, He Gen, Zhang Yuhu, Hou Jie, Huang Xingao, Li Ning, Chen Jianhua, Sun Shu, Liu Changsen, Zhang Hongliang,
Hou Huining, Yin Changguang, Sun Jianwei, Chen Rui, Sun Changzhi, Wang Hailing, Ye Weihe, Li Huacheng, Wang Ying, Chen Tongyu, Fan Yonghui.
The release status of previous versions of this document and the documents it replaces are as follows.
---First published as GB/T 26081-2010 in.2010;
--- This is the first revision.
Ductile iron pipes, fittings and accessories for drainage works
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
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