Standard Specification for High Density Polyethylene (HDPE) Pipes for Water Supply

National standard for high-density polyethylene (HDPE) pipes for water supply National Standard of the People’s Republic of China GB/T 13663-92 High-density polyethylene (HDPE) pipes for water supply High-density polyethylene pipes for water supply

1 Subject content and scope of application This standard specifies the size specifications, technical requirements, test methods, inspection rules, and markings of high-density polyethylene pipes (hereinafter referred to as pipes) for water supply that use high-density polyethylene resin as the main raw material and are extruded. , Packaging, transportation and storage. This standard applies to pipes for water supply inside and outside buildings (overhead or buried). This standard does not apply to pipes that transport water with a temperature exceeding 45°C. To

2 Reference standards GB 2828 Batch-by-batch inspection, sampling procedures and sampling tables (applicable to continuous batch inspections) GB 2918 Standard environment for state adjustment and testing of plastic samples GB 5009.60 Analysis methods for hygienic standards for polyethylene, polyethylene, and polymolded products GB 6111 Thermoplastic pipes under long-term constant internal pressure Determination of damage resistance time GB 6671.2 Determination of longitudinal dimensional shrinkage of polyethylene pipes GB 8804.2 Thermoplastic pipe tensile performance test method Polyethylene pipes GB 8805 Rigid plastic pipe bending degree measurement method GB 8806 Plastic pipe size measurement method GB 9687 Hygienic standard for polyethylene molded products for food packaging

3 Pipe specifications The pipe specifications are expressed in the expression de (nominal outer diameter) × e (nominal wall thickness) and the nominal outer diameter, nominal wall thickness, and nominal pressure of the pipe, please refer to the standard text file. To

4 Technical requirements

4.1 The color is generally black or natural, and it can also be determined by negotiation between the supplier and the buyer. …

4.2 Appearance The inner and outer walls of the pipe should be smooth and flat, and no bubbles, cracks, discoloration lines, and scratches that affect use are not allowed. Both ends of the pipe should be cut flat and perpendicular to the axis. …

4.3 Pipe specifications and dimensions 4.3.1 The average outer diameter limit deviation and wall thickness limit deviation of the pipe should meet the requirements of Table 1. To

4.3.2 The limit deviation of the wall thickness of the same section of the pipe shall not exceed 14%. To

4.3.3 At room temperature, the minimum length of the pipe is 4m, the lower deviation of the limit deviation is 0, and the upper deviation is 2% of the length. To

4.4 The curvature of the pipe shall meet the requirements of Table 3. To

4.5 The physical mechanical energy of the pipe shall meet the requirements of Table 4. To

4.6 The sanitary performance of drinking water pipes should meet the requirements of GB 9687. To

5 Test method 5.1 Standard environment for sample state adjustment and test According to GB 2918, the temperature is 23±2℃, the state adjustment time is not less than 24h, and the test is carried out under this condition. To

5.2 Visual inspection Observe directly with naked eyes, and observe under backlight with a light source. To

5.3 Dimension measurement 5.3.1 Length is measured with a measuring tool with an accuracy of 10mm. To

5.3.2 Outer diameter Measured according to GB 8806 regulations. …

5.3.3 Wall thickness is measured in accordance with GB 8806. To

5.3.4 The wall thickness deviation of the same section is calculated as follows: e′=(e1-e2)/e1×100 where: e1?D?D The maximum wall thickness of the same section of the pipe, mm;

The minimum wall thickness of the same section of e2?D?D pipe, mm. To

5.4 Curvature According to GB8805. To

5.5 Tensile yield stress Measured in accordance with GB 8804.2.

5.6 The longitudinal size shrinkage rate is determined in accordance with the provisions of GB 6671.1.

5.7 Hydraulic test 5.7.1 The hydraulic test method shall be in accordance with GB 6111.

5.7.2 The temperature and hoop stress test time of the hydraulic test shall be as specified in Table 4. …

5.8 The measurement of hygienic performance shall be carried out in accordance with the provisions of GB 5009.60. To

6 Inspection rules

6.1 Products must be inspected and qualified by the quality inspection department of the manufacturer before they can leave the factory. 6.2 Batches The pipes of the same specification produced under the same raw material, formula and process are a batch, and the quantity of each batch does not exceed 10t. If the production quantity is small and the production period is less than 10t, the 6d output will be used as a batch. 6.3 Ex-factory inspection 6.3.1 Ex-factory inspection items are the tensile yield stress longitudinal ruler shrinkage rate in 4.1~4.5 and 4.6. To

6.3.2 Articles 4.1~4.5 shall be carried out in accordance with GB 2828, using normal sampling plan, taking general inspection level I, qualified quality level, 6.5, see Table 5. 6.3.3 Among the samples qualified for sampling by counting, sufficient samples shall be randomly selected to carry out the determination of tensile yield stress and longitudinal dimensional shrinkage in Article 4.6.

6.4 Type inspection 6.4.1 Type inspection items are all technical requirements. To

6.4.2 Articles 4.1~4.5 shall be sampled and inspected in accordance with the provisions of 6.3.2. Sufficient samples shall be randomly selected from the samples that have passed the inspection to test the remaining properties. To

6.4.3 Type inspection should be carried out in one of the following situations;

a. During normal production, no less than once a year;

B. If major changes in raw materials and processes may affect product performance;

C. When production is stopped for more than three months and production is resumed;

D. When there is a big difference between the factory inspection result and the last type inspection;

E. When the national quality supervision agency proposes to conduct a type inspection. To

6.5 Judgment If any one of items 4.1 to 4.5 does not meet the requirements of Table 5, it shall be judged as unqualified. When one of the physical and mechanical properties fails to meet the target, double the item can be randomly selected for re-inspection. If it is still unqualified, the batch will be judged as unqualified. …

6.6 The user has the right to conduct random inspections of products in accordance with this standard, and the right to reject batches that fail the random inspection. 7 signs, packaging, transportation, storage

7.1 Marks When the product leaves the factory, there should be an obvious mark on the product, indicating the name of the manufacturer (trademark) and product name (the name of the drinking water pipe should be followed by the word “Y”, and if it is a socket pipe, the word “Y” should be added after the word “Y”. “Socket”), specifications and dimensions (indicating outer diameter and nominal pressure), the batch number, quantity, production date and inspector code are marked on the product packaging, and the product quality certificate of the sanctioned inspection department is attached. To

7.2 Packaging The application of pipes (tied with straw ropes or other materials) can also be negotiated and determined according to user requirements. …

7.3 Transportation During transportation, the pipes shall not be subject to severe blows and sharp objects, and shall not be thrown or exposed to the sun. …

7.4 Storage The temperature of the storage environment for pipes should not exceed 40°C, and outdoor exposure is not allowed. The storage and site should be level, and the stacking should be neat, the stacking height should not exceed 1.5m, and the distance from the heat source should not be less than 1m. The storage period shall not exceed one year from the date of production. Additional explanation: This standard was proposed by the Ministry of Light Industry of the People’s Republic of China. This standard is under the jurisdiction of the Light Industry Plastics Factory Processing and Applied Science Research Institute. This standard was drafted by Dalian Third Plastic Factory, and Dalian Plastics Research Institute participated in the drafting. The main drafters of this standard are Jiang Xiulan, Wang Cheng, Lin Youfang, Xue Yixin, and Yu Hui.