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GB/T 18742.2-2017Polypropylene (PP) piping systems for hot and cold water installations - Part 2: Pipes (English PDF)

冷热水用聚丙烯管道系统第2部分：管材

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

October 14, 2017

Implementation date

May 5, 2018

Scope

GB/T 18742.2-2017 is the English-translated version of 冷热水用聚丙烯管道系统第2部分：管材.

GB/T 18742.2 is the second part of the Chinese standard for polypropylene hot and cold water piping systems and it covers the pipe itself. PP-R is the dominant material for domestic water plumbing in China, used in the great majority of new apartments, so this is one of the highest volume plastic pipe standards in the world.

What the standard has to guarantee is a fifty year life at temperature and pressure, and everything in it serves that: the classification by application class and design pressure, the requirements on the material and its designation, the dimensions, wall thicknesses and tolerances by pipe series, the appearance and the opacity, the mechanical requirements including the hydrostatic strength at the several temperature and time combinations that establish the long-term behaviour, the impact resistance, the longitudinal reversion and the thermal stability, together with the test methods, the sampling and inspection rules and the marking.

For a pipe maker, an installer or a developer in China, this is the acceptance text.

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Document preview — GB/T 18742.2-2017

National Standard of the People's Republic of China

Replacing: GB/T 18742.2-2002

Issued by: the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

1 Scope
2 Normative References
3 Terms and Definitions, Symbols and Abbreviations
4 Materials
5 Product Classification
6 Selection of S Value of Pipe Series
7 Requirements
8 Experiment Method
9 Testing Regulations
10 Signs, Packaging, Transport, Storage

Foreword

1 Scope

This part of GB/T 18742 specifies the definition, symbols and abbreviations, materials, product classifications, tube series of polypropylene cross-standards (hereinafter referred to as “pipes”) made of polypropylene mixed ingredients and extruded. S value selection, requirements, test methods, inspection rules and signs, packaging, transport and storage.

This part applies together with GB/T 18742.1, GB/T 18742.3 for hot and cold water piping systems in buildings, including drinking water and heating piping systems.

Note: The purchaser has the responsibility to properly select this product according to its specific application requirements in conjunction with relevant regulations, standards or regulatory requirements.

This standard does not apply to fire suppression systems.

2 Normative References

The provisions of the following documents, through reference in this text, constitute the provisions of this standard. For dated reference, subsequent amendments to (excluding corrections to), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition referred to apply.

GB/T 2828.1—2012 Count Sampling Inspection Procedures Part 1: Batch Inspection Sampling Plans Based on AQL (ISO 2859-1:1999, IDT)

GB/T 2918—1998 Standard Environment for Conditioning and Testing Plastic Specimen (Idt ISO 291:1997)

GB/T 3682-2000 Determination of Mass Flow Rate and Melt Volume Flow Rate of Thermoplastic Melts (Idt ISO 1133:1997)

GB/T 6111—2003 Test Method For Internal Pressure Resistance Of Thermoplastic Pipes For Fluid Transport (ISO 1167:1996, IDT)

GB/T 6671-2001 Determination Of Longitudinal Shrinkage Of Thermoplastic Pipes (Eqv ISO 2505:1994)

GB/T 8806—2008 Plastics Piping Systems Measurement Of Dimensions Of Plastic Parts (ISO 3126:2005, IDT)

GB/T 9345.1-2008 Plastics Determination Of Ash Part 1: General Methods (ISO 3451-1:1997, IDT)

GB/T 10798-2001 General Wall Thickness Table For Thermoplastic Pipes (Idt ISO 4065:1996)

GB/T 17219 Safety Evaluation Standard For Drinking Water Distribution Equipment And Protective Materials For Drinking Water

GB/T 18251-2000 Test Method For Dispersion Of Pigments And Carbon Black In Polyolefin Pipes, Fittings And Mixes

GB/T 18742.1-2017 Polypropylene Piping System for Hot and Cold Water - Part 1: General (ISO 15874-1:2013, MOD)

GB/T 18742.3—2017 Polypropylene Piping System For Hot and Cold Water—Part 3: Pipe Fittings (ISO 15874-3:2013, MOD)

GB/T 18743—2002 Thermoplastics Pipes For Fluid Transport Simple Beam Impact Test Methods (Eqv ISO 9854-1 To 9854-2:1994)

GB/T 19466.3-2004 Plastics - Differential Scanning Calorimetry (DSC) - Part 3: Determination of Melting And Crystallization Temperature And Enthalpy (ISO 11357-3:1999, IDT)

GB/T 19466.6-2009 Plastics - Differential Scanning Calorimetry (DSC) - Part 6: Determination Of Oxidation Induction Time (Isothermal OIT) And Oxidation Induction Temperature (Dynamic OIT) (ISO 11357-6:2008, MOD)

GB/T 19473.2—2004 Polybutylene (PB) Piping System for Hot And Cold Water Part 2: Pipes

GB/T 19993-2005 Thermoplastics Piping System For Hot And Cold Water Hot-Circulation Test Method for Pipe Fittings System

3 Terms and Definitions, Symbols and Abbreviations

For the purpose of this standard, the terms and definitions, symbols and abbreviations defined in GB/T l8742.1-2017 apply.

4 Materials

Polypropylene mixed ingredients for the production of pipes should meet the requirements of Chapters 6 and 7 of GB/T 18742.1-2017.

5 Product Classification

5.1 Pipes are divided into beta-type PP-H, PP-B, PP-R, and beta-crystal PP-RCT pipes according to the polypropylene mixture.

5.2 Pipes are divided into S6.3, S5, S4, S3.2, S2.5, and S2 according to the pipe series. The relationship between the series S and the maximum allowable working pressure (20 °C, 50 years) is shown in Annex C.

6 Selection of S Value of Pipe Series

According to different materials of pipes, the corresponding S values are determined by condition levels and design pressure, see Table 1, Table 2, Table 3, Table 4. For other pressure specifications, the corresponding S value shall be decided according to the agreement between the supply and demand sides, and the designed lifetime shall meet the requirements of 50 years.

7.1 Color

Generally gray, other colors can be negotiated between the supply and demand parties.

7.2 Appearance

The surface color of the pipe should be uniform and there should be no obvious color difference.

The inner and outer surfaces of the pipe should be smooth and flat. There should be no depressions, bubbles, impurities, and other surface defects that affect the product's performance. The end face of the pipe should be cut flat and perpendicular to the axis.

7.3 Specifications and dimensions

7.3.1 Pipe specification pipe series S, Nominal outside diameter dn × Nominal wall thickness en.

Example: Tube series S5, nominal diameter 32 mm, nominal wall thickness 2.9 mm

Expressed as S5 dn32×en2.9

7.3.2 The nominal outside diameter, the average outside diameter of the pipe, and the minimum wall thickness corresponding to the pipe series s (excluding the wall thickness of the barrier layer and the adhesive layer) are shown in Table 5.The total wall thickness of the barrier layer and the adhesive layer should not exceed 0.4 mm.

Table 5 Pipe Series and Specifications Size In Millimeters

Nominal outside diameter

dn Average outside diameter Nominal wall thickness en

dem,min dem,max Tube series

S6.3a S5 S4 S3.2 S2.5 S2

16 16.0 16.3 — — 2.0 2.2 2.7 3.3

20 20.0 20.3 — 2.0 2.3 2.8 3.4 4.1

25 25.0 25.3 2.0 2.3 2.8 3 5 4.2 5.1

32 32.0 32.3 2.4 2.9 3.6 4.4 5.4 6.5

40 40.0 40.4 3.0 3.7 4.5 5.5 6.7 8.1

50 50.0 50.5 3.7 4.6 5.6 6.9 8.3 10 1

63 63.0 63.6 4.7 5.8 7.1 8.6 10.5 12 7

75 75.0 75.7 5.6 6.8 8.4 10.3 12.5 15.1

90 90.0 90.9 6.7 8.2 10.1 12.3 15.0 18.1

10 Signs, Packaging, Transport, Storage

Annex A (Informative) Structural Changes of This Standard In Comparison With ISO 15874-2:

Annex B (Informative) Technical Differences Between this Part and ISO 15874-2:2013 and Their Reasons

Annex C (Informative) Relationship Between Tube Series S and Maximum Allowable Working Pressure (20°C, 50 Years)

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 39 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 2859 · ISO 1167.1996 · ISO 3126.2005 · ISO 3451 · ISO 15874 · ISO 11357

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