ICS 83.140.30
G 33
National Standard of the People’s Republic of China
GB/T 18742.2-2017
Replaces GB/T 18742.2-2002
Polypropylene piping systems for hot and cold water installations
Part 2: Pipes
冷热水用聚丙烯管道系统 第2部分: 管材
(ISO 15874-2: 2013, Plastics Piping Systems for Hot And Cold Water Installations — Polypropylene (PP)—Part 2: Pipes, MOD)
(English Translation)
Issue date: 2017-10-14 Implementation date: 2018-05-05
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
Content
Foreword i
1 Scope 1
2 Normative References 1
3 Terms and Definitions, Symbols and Abbreviations 2
4 Materials 2
5 Product Classification 3
6 Selection of S Value of Pipe Series 3
7 Requirements 3
8 Experiment Method 10
9 Testing Regulations 13
10 Signs, Packaging, Transport, Storage 16
Annex A (Informative) Structural Changes of This Standard In Comparison With ISO 15874-2:2013 18
Annex B (Informative) Technical Differences Between this Part and ISO 15874-2:2013 and Their Reasons 20
Annex C (Informative) Relationship Between Tube Series S and Maximum Allowable Working Pressure (20°C, 50 Years) 23
Annex D (Informative) System Suitability 24
Foreword
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
GB/T 18742 Polypropylene Piping System for Hot and Cold Water Installations is divided into 3 parts:
- Part 1: General;
- Part 2: Pipes;
- Part 3: Fittings.
This part is part 2 of GB/T 18742.
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 18742.2-2002 "Polypropylene piping system for hot and cold water installations, Part 2: Pipes". Compared with GB/T 18742.2-2002, the main technical changes are as follows:
- The polypropylene pipe material is modified to polypropylene mixed material as raw material (see Chapter 1);
- Remove "industrial and civilian hot and cold water" and "pipes used in systems that do not use water as a medium" in the scope of application (see Chapter 1 of the 2002 edition);
- Add notes on the content of trade (see Chapter 1);
- Add and update relevant normative references (see Chapter 2);
——Revision “The raw material used for production of pipes shall be polypropylene pipe material that meets the requirements of GB/T 18742.1” shall be modified to “The polypropylene compound used for the production of pipe materials shall meet the requirements of Chapters 6 and 7 of GB/T 18742.1-2017. (See Chapter 4);
- In this standard, "PP-H" is modified to "β crystal PP-H";
- Polypropylene mixed ingredients added to the pipe to increase the β-crystal PP-RCT pipe (see 5.1);
——The S6.3 series is added to the pipes according to the pipe series, and the “Relationship between Annex B pipe series S and nominal pressure PN” is revised to “The relationship between Annex C pipe series S and the maximum allowable working pressure (20°C, 50 years) "(see 5.2, Annex C);
- Recalculate the selection of tube series S values and increase the choice of beta crystal PP-RCT tube series S (see Chapter 6);
- Re-explanate pipe appearance requirements (see 7.2);
- Increase the total wall thickness requirements of the barrier layer and the adhesive layer with a barrier layer (see 7.3.2);
- Remove the size requirement for "nominal outside diameter dn 12 mm" (see 7.4.2 of the 2002 edition);
- Expand the nominal outside diameter to dn 200 mm (see 7.3.2);
- Increase the nominal wall thickness of the pipe series S6.3 and indicate that the pipe series S6.3 applies only to the β-crystalline PP-RCT pipe (see 7.3.2);
- Increase allowable deviation of wall thickness (see 7.3.4);
- Separately list the hydrostatic strength of the pipe, modify some of the hydrostatic stress valuesand increase the hydrostatic strength of the beta crystal PP-RCT pipe (see 7.4);
- Increase the physical and chemical performance requirements of β-crystalline PP-RCT (see 7.5);
- Increase ash content, melting temperature, oxidation induction time, oxidation induction time after 95°C/1 000 h hydrostatic test, pigment dispersion, light transmittance, oxygen permeability requirements (see 7.5);
- Amend the requirements for the qualified determination of the simply supported beam impact test (see 7.5);
- Modify the melt mass-flow rate and the change rate of the corresponding polypropylene compounding (see 7.5);
- Remove the requirement of opaqueness, place it in Table 8 of this part and modify it to light transmittance (see 7.5);
- Add note to "System suitability of mechanically connected pipes and fittings" (see 7.7.1);
- Recalculate the test pressure value of the internal pressure test and increase the internal pressure test requirements for the beta crystal PP-RCT (see 7.7.2);
- The "prediction method for prestressing" is deleted and "prestressing" is placed in Table 10 (see 7.7.3);
- Increase pre-stress of beta-form PP-RCT (see 7.7.8);
- Remove Annex A of GB/T 18742.2-2002 (see Annex A of the 2002 edition);
- Add and modify test methods (see Chapter 8);
- Add inspection classification (see 9.1);
- Modify group batch and grouping requirements (see 9.2.1, 9.2.2);
- Increase the requirements for stereotyped inspection projects (see 9.3);
- Increase the factory inspection project requirements, and explain the hydrostatic test of beta-form PP-H, PP-B, PP-R, and β-crystal PP-RCT (see 9.4.1);
- Revise a sampling plan for normal inspection. The qualified quality level 6.5 is changed to the acceptance quality limit (AQL) 4.0 and the "batch range" is added (see 9.4.2).
- Increase control point inspection requirements (see 9.5);
- Increase type inspection project requirements (see 9.6.2);
- Modify type inspection time requirements (see 9.6.3);
- Amend "unqualified batch" to "unqualified batch (or product)" (see 9.7);
- Modify the content of the product name in the mark is modified (see 10.1.1);
- Add signs to the content of the production lot, non-exposed pipes, and barriers with a barrier layer (see 10.1.1);
- Remove clauses that should not mark the PN value to prevent confusion during use (see 10.1.3 of the 2002 edition);
- Remove the requirement that "the quality of each package is generally not more than 25 kg, and can also be negotiated and determined according to user requirements" (see 10.2 of the 2002 edition);
- Add informative Annex "This part of the structure changes compared with ISO 15874-2:2013" (see Annex A);
- Add informative Annex "Technical Differences between this Part and ISO 15874-2:2013 and their causes" (see Annex B);
- Add Informative Annex "System Applicability" (see Annex D).
This standard uses the redrafted method to amend ISO 15874-2:2013 "Polypropylene Piping Systems for Hot and Cold Water Equipment - Part 2: Pipes" (in English).
This part has more structural adjustments than ISO 15874-2:2013. A list of the comparison between the chapter number of this standard and the chapter number of ISO 15874-2:2013 is listed in Annex A.
There are technical differences between this part and ISO 15874-2:2013, and a list of the corresponding technical differences and their causes are given in Annex 8.
This standard uses the currently valid national standards and replaces the references in ISO 15874-2:2013.
Please note that some of the contents of this document may involve patents. The issuing agency of this document does not assume responsibility for identifying these patents.
This part was proposed by China National Light Industry Council and is under the jurisdiction of the National Technical Committee 15 on Plastic of Standardization Administration of China (SAC/TC 48).
The previous version of the standards replaced by this standard is:
- GB/T 18742.2-2002.
Polypropylene Piping System for Hot and Cold Water Installations
Part 2: Pipes
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
GB/T 21300-2007 Plastics Pipes And Fittings Determination Of Opacity (ISO 7886:2005, IDT)
ISO 17455:2005 Plastics Piping Systems Determination Of Oxygen Barrier Properties Of Multilayer Pipes (Plastics Piping Systems—Muhilayer Pipes—Determination Of The oxygen permeability of the barrier pipe)
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 β-type PP-H, PP-B, PP-R, and β-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 Requirements
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
110 110.0 111.0 8.1 10.0 12.3 15.1 18.3 22.1
125 125.0 126.2 9.2 11.4 14.0 17.1 20.8 25.1
140 140.0 141.3 10.3 12.7 15.7 19.2 23.3 28.1
160 160.0 161.5 11.8 14.6 17.9 21.9 26.6 32,1
180 180.0 181.7 13.3 16.4 20.1 24.6 29.0 36 1
200 200.0 201.8 14.7 18.2 22.4 27.4 33.2 40.1
a Only applicable to beta crystal PP-RCT tubing.
7.3.3 The length of the pipe is generally 4 m or 6 m, which can also be agreed upon by the supply and demand sides. Pipe length should not have negative deviations.
7.3.4 The allowable deviation of wall thickness of the same standard of the pipe shall meet the requirements of Table 6.
Foreword i
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
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)
Annex D (Informative) System Suitability
