GB/T 13664-2023Unplasticized poly(vinyl chloride)(PVC-U) pipes for low-pressure conveyance in irrigation (English PDF)

Foreword

This document is drafted in accordance with the rules given in GB/T 1.1-2020, Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.

This document replaces GB/T 13664-2006, Unplasticized poly(vinyl chloride) (PVC-U) pipes for low-pressure water conveyance in irrigation. Compared with GB/T 13664-2006, apart from structural adjustments and editorial changes, the main technical changes are as follows:

- the scope of application of the product has been changed (see Clause 1; Clause 1 of the 2006 edition);

- terms and definitions, symbols and abbreviations have been added (see Clauses 3 and 4);

- requirements for materials have been added (see Clause 5);

- the product classification has been changed (see Clause 6; Clause 3 of the 2006 edition);

- a requirement for the out-of-roundness of pipes has been added, and the wording of the requirement for the mean outside diameter of pipes has been changed (see 7.3.2; 4.3 of the 2006 edition);

- the dimensions of pipes have been changed: the range of outside diameters has been extended to 630 mm, the dimension series for nominal pressure 0.2 MPa has been deleted, and dimension series for nominal pressures 0.5 MPa and 0.63 MPa have been added (see 7.3.3; 4.3 of the 2006 edition);

- dimensional requirements for pipe sockets for the different jointing methods have been added (see 7.3.4);

- requirements for pipe spigots have been added (see 7.3.5);

- the requirement and test method for straightness have been deleted (see 4.4 and 5.4 of the 2006 edition);

- the requirements for falling-weight impact resistance, ring stiffness and flattening have been changed (see 7.4; 4.5 of the 2006 edition);

- a requirement and test method for lead content have been added (see 7.5 and 8.13);

- a requirement and test method for leak tightness have been added (see 7.6 and 8.14);

- requirements and test methods for the Vicat softening temperature and the elongation at break of pipes have been added (see 8.6 and 8.7);

- the test conditions for falling-weight impact resistance have been changed (see 8.10; 5.9 of the 2006 edition);

- grouping has been added (see 9.2.2);

- the factory exit inspection items and the sampling scheme have been changed (see 9.3; 6.3 of the 2006 edition);

- the marking has been changed (see 10.1; 7.1 of the 2006 edition).

Attention is drawn to the possibility that some elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.

This document was proposed by the China National Light Industry Council.

This document is under the jurisdiction of the National Technical Committee on Plastic Products of Standardization Administration of China (SAC/TC 48).

Drafting organisations of this document: Gongyuan Co., Ltd., Hebei Quanen Gaoke Pipe Industry Co., Ltd., Guangdong Liansu Technology Industrial Co., Ltd., Zhejiang Aikang Industrial Co., Ltd., Fujian Jiyou Plastic Co., Ltd., Gudi Technology Co., Ltd., Zhejiang Zhongcai Pipes Technology Co., Ltd., Sinopec (Beijing) Research Institute of Chemical Industry Co., Ltd., Nan Ya Plastics Industry (Xiamen) Co., Ltd., Shandong Dongxin Plastic Technology Co., Ltd., and Shandong Donghong Pipe Industry Co., Ltd.

Main drafters of this document: Huang Jian, Zhu Ruixia, Li Tongyi, Qiu Qiang, Lin Zhanghong, Li Xianmei, Wang Baiti, Sun Jiawen, Lin Yanqing, Pan Fuqu, Ni Fengyao, Sun Huali.

The previous editions of this document and of the document it replaces are as follows:

- first published in 1992 as GB/T 13664-1992, first revised in 2006;

- this is the second revision.

1 Scope

This document specifies the requirements for unplasticized poly(vinyl chloride) (PVC-U) pipes for low-pressure conveyance in irrigation (hereinafter referred to as "pipes"), including materials, product classification, colour, appearance, dimensions and physical and mechanical properties; it describes the corresponding test methods and specifies the inspection rules, marking, packaging, transport and storage.

This document is applicable to the production, inspection and sale of PVC-U pipes for low-pressure irrigation with a nominal pressure of 0.63 MPa and below, extruded from unplasticized poly(vinyl chloride) (PVC-U) compound.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 1033.1 Plastics - Methods for determining the density of non-cellular plastics - Part 1: Immersion method, liquid pycnometer method and titration method

GB/T 1040.2 Plastics - Determination of tensile properties - Part 2: Test conditions for moulding and extrusion plastics

GB/T 1633 Thermoplastics - Determination of Vicat softening temperature (VST)

GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection

GB/T 2918 Plastics - Standard atmospheres for conditioning and testing

GB/T 5761 Suspension-process general-purpose poly(vinyl chloride) resin

GB/T 6111 Thermoplastics piping systems for the conveyance of fluids - Determination of resistance to internal pressure

GB/T 6671 Thermoplastics pipes - Determination of longitudinal reversion

GB/T 8802 Thermoplastics pipes and fittings - Determination of Vicat softening temperature

GB/T 8804.2 Thermoplastics pipes - Determination of tensile properties - Part 2: Pipes made of unplasticized poly(vinyl chloride) (PVC-U), chlorinated poly(vinyl chloride) (PVC-C) and high-impact poly(vinyl chloride) (PVC-HI)

GB/T 8806 Plastics piping systems - Plastics components - Determination of dimensions

GB/T 9647 Thermoplastics pipes - Determination of ring stiffness

GB/T 10002.1-2023 Unplasticized poly(vinyl chloride) (PVC-U) pipes for water supply

GB/T 14152 Thermoplastics pipes - Determination of resistance to external blows - Round-the-clock method

GB/T 19278 General terms and definitions for thermoplastics pipes, fittings and valves

GB/T 19471.1 Plastics piping systems - Elastomeric sealing ring type socket joints for unplasticized poly(vinyl chloride) (PVC-U) pipes - Test method for leak tightness under angular deflection

GB/T 19471.2 Plastics piping systems - Elastomeric sealing ring type socket joints for unplasticized poly(vinyl chloride) (PVC-U) pipes - Test method for leak tightness under negative pressure

GB/T 26125-2011 Electrical and electronic products - Determination of six regulated substances (lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers)

QB/T 2568 Solvent cements for unplasticized poly(vinyl chloride) (PVC-U) plastics piping systems

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB/T 19278 apply.

4 Symbols and abbreviations

5 Materials

5.1 The material used to produce the pipes shall be unplasticized poly(vinyl chloride) (PVC-U) compound. The compound shall be based mainly on poly(vinyl chloride) (PVC) resin with the necessary additives added, and the additives shall be uniformly dispersed; additives containing lead shall not be used. The properties of the material shall meet the requirements of Table 1.

Table 1 - Properties of the material:

1. Vicat softening temperature: requirement >= 80 °C; test parameters: heating rate 50 °C/h, load 50 N, specimen size 10.0 mm × 10.0 mm × 4.0 mm; test method GB/T 1633.

2. Tensile yield stress: requirement >= 40 MPa; test parameters: test speed 5 mm/min, specimen type 1B, h = 4.0 mm; test method GB/T 1040.2.

3. Tensile modulus of elasticity: requirement >= 2 500 MPa; test parameters: test speed 1 mm/min, specimen type 1B, h = 4.0 mm; test method GB/T 1040.2.

5.2 The PVC resin shall meet the requirements of GB/T 5761; the K value of the resin shall be not less than 66, and the vinyl chloride monomer content shall be not more than 5 µg/g.

5.3 Only a small amount of clean reprocessable material of the same type of product produced in the manufacturer's own plant may be used.

5.4 Elastomeric sealing rings shall comply with Annex C of GB/T 10002.1-2023.

5.5 Solvent cement used for bonding shall comply with QB/T 2568.

6 Product classification

According to the jointing method, pipes are classified into pipes with elastomeric sealing ring joints and pipes with solvent cement joints.

7 Requirements