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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. CJ/T 120-2016: Coating plastic steel pipe for water supply Status: Valid CJ/T 120: Historical versions
Basic dataStandard ID: CJ/T 120-2016 (CJ/T120-2016)Description (Translated English): Coating plastic steel pipe for water supply Sector / Industry: Urban Construction Industry Standard (Recommended) Classification of Chinese Standard: P41 Classification of International Standard: 91.140.60 Word Count Estimation: 17,158 Date of Issue: 2016-01-27 Date of Implementation: 2016-07-01 Older Standard (superseded by this standard): CJ/T 120-2008 Regulation (derived from): Ministry of Housing and Urban-Rural Development Announcement No. 1037 of 2016; Industry Standard Record-keeping Notice No. 6 of 2016 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China CJ/T 120-2016: Coating plastic steel pipe for water supply---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.Coating plastic steel pipe for water supply ICS 91.140 P41 The People's Republic of China Urban Construction Industry Standard Replace CJ/T 120-2008 Water supply plastic coated composite steel pipe Released on.2016-01-27 2016-07-01 implementation Issued by the Ministry of Housing and Urban-Rural Development of the People's Republic of China Table of contentsPreface Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Classification and marking 2 5 Material 2 6 Requirements 4 7 Test method 6 8 Inspection rules 9 9 Marking, packaging, transportation and storage 10 Appendix A (Normative Appendix) Determination of adhesion of polyethylene coating 11 Appendix B (Normative Appendix) Determination of adhesion of epoxy resin coating 12 Appendix C (informative appendix) Repair of coating defects of plastic-coated steel pipe 13ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard is a revision of CJ/T 120-2008 "Plastic-coated Composite Steel Pipe for Water Supply". Compared with CJ/T 120-2008, the main technology The content changes are as follows. --- Increase the scope of application of plastic-coated composite steel pipe; ---The classification and marking of plastic coated steel pipes are divided; ---Modified the requirements for the materials used in plastic-coated composite steel pipes; ---Added the requirements for base pipe processing and surface treatment before plastic coating; ---Modified the specifications and coating wall thickness of the plastic-coated composite steel pipe; ---Supplement the relevant provisions of the test method for intercepting samples; ---Added the inspection items of the external coating in the factory inspection; ---Added regulations on repairing defects in plastic-coated steel pipe coating. This standard was proposed by the Standard Rating Institute of the Ministry of Housing and Urban-Rural Development. This standard is under the jurisdiction of the Technical Committee for Standardization of Building Water Supply and Drainage of the Ministry of Housing and Urban-Rural Development. Drafting organizations of this standard. China Construction Metal Structure Association, Tianjin Youfa Steel Pipe Group Co., Ltd., Tianjin Haohang Composite Pipe Industry Co., Ltd., Zhejiang Jinzhou Pipeline Technology Co., Ltd., Weifang Dongfang Steel Pipe Co., Ltd., Hangzhou Chunyuan Steel Plastic Pipe Co., Ltd., Shanghai De Water Purification Pipeline Co., Ltd., Tianjin Juncheng Steel Pipe Technology Group Co., Ltd., Tianjin Lida Steel Pipe Group Co., Ltd., Guangdong Liansu Technology Industrial Co., Ltd., Shanghai Haoli Plastic Coated Steel Pipe Co., Ltd., Tianjin Tsinghua Hengsen Pipe Manufacturing Co., Ltd., Tianjin Jiusheng Tongda Technology Co., Ltd., Chongqing Minghao Pipe Industry Co., Ltd., Jiangyin Huaxi Jieai Steel Plastic Pipe Co., Ltd., Tianjin Ruiyuan Powder Coating Co., Ltd., Shan Dongwofeng Green Pipe Co., Ltd., Axalta Huajia Chemical Co., Ltd., Changzhou Tengda Pipe Co., Ltd., Shandong Juli Pipe Co., Ltd., Langfang Xinli Powder Coating Co., Ltd., Shanghai Shipbuilding Technology Research Institute, Guangdong Ronggang Iron and Steel Co., Ltd., Hubei Xinhantong Pipe Industry Co., Ltd. Division, Huangshan Ruibang Polymer Material Co., Ltd., Jinan Mike Pipeline Technology Co., Ltd., Haicheng Liaohe Large Steel Pipe Co., Ltd. The main drafters of this standard. Wang Xiangong, Cao Hao, Zhang Songming, Liu Fengliang, Liu Jianxing, Xu Deru, Chen Shibo, Fan Xiaomin, Jiang Jianming, Guo Jianjun, Yu Fuqiang, Zhang Weifeng, Sun Zhenxiang, Yang Yuanyuan, Wang Congshui, Xu Bing, Liu Jiandong, Bi Xuezhen, Wang Xuemin, Wang Meili, Lu Xiaodong, Jiao Yufeng, Cui Zhigang, Xiao Shanhong, Deng Weiqin, Li Tiansheng, Fang Wensheng, Zhao Qiang, Yu Kaixiang. The previous versions of the standard replaced by this standard are as follows. ---CJ/T 120-2001; ---CJ/T 120-2008. Water supply plastic coated composite steel pipe1 ScopeThis standard specifies the terms and definitions, classification and markings, materials, requirements, and tests of plastic-coated composite steel pipes for water supply (hereinafter referred to as plastic-coated steel pipes) Methods, inspection rules, marking, packaging, transportation and storage. This standard is applicable to the design, manufacture and manufacture of plastic-coated steel pipes for water supply whose nominal size is not greater than DN2000 and the temperature of the conveying medium is lower than 45℃. test. For the non-threaded connection of plastic-coated steel pipe fittings, the plastic coating process and coating requirements can refer to this standard.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 1033 Plastic Non-foam Plastic Density Determination Part 1.Immersion Method, Liquid Pycnometer Method and Titration Method GB/T 1040.1 Determination of tensile properties of plastics Part 1.General GB/T 1633 Thermoplastics Determination of Vicat Softening Temperature (VST) GB/T 2914 Plastic Vinyl Chloride Homopolymer and Copolymer Resin Volatile (including Water) Determination GB/T 3091 Welded steel pipe for low pressure fluid transportation GB/T 6554 Resin-based reactive compounds for electrical insulation Part 2.Test methods for electrical powder coating GB/T 7306 (all parts) 55° sealed pipe thread GB/T 8163 Seamless steel pipe for conveying fluid GB/T 8923.1-2009 Visual assessment of surface cleanliness of steel surface treatment before coating. Part 1.Rust grade and treatment grade of uncoated steel surface and steel surface after comprehensive removal of the original coating GB/T 9119 plate flat welded steel pipe flange GB/T 9124 Steel pipe flange technical conditions GB/T 13295 Ductile iron pipes, fittings and accessories for water and gas GB/T 17219 Safety evaluation standard for drinking water distribution equipment and protective materials CJ/T 156 groove type pipe joint SY/T 5037 Submerged arc welded steel pipe for ordinary fluid transportation pipeline3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Base tube Steel pipe before powder coating. 3.2 Plastic coated steel pipe The steel pipe is used as the base pipe, and the plastic powder is used as the coating material. The plastic layer is melt-coated on its inner surface through the plastic coating process such as suction coating and spraying. The outer surface of the steel-plastic composite pipe is melt-coated with a plastic layer or another process is used to coat the outer surface with an anti-corrosion layer of other materials.4 Classification and marking4.1 Classification 4.1.1 According to the inner coating material, it is divided into polyethylene coating and epoxy resin coating. 4.1.2 According to the outer coating (plating) layer material, it is divided into hot-dip galvanized layer, epoxy resin coating and polyethylene coating. 4.2 Marking 4.2.1 The product mark consists of the code of the plastic-coated steel pipe, the code of the inner coating material, the code of the outer coating material and the nominal size. Steel-plastic composite pipe code, SP Coating code, T Code of inner coating material, polyethylene is PE, epoxy resin is EP )-DN The outer coating material code, polyethylene is PE, epoxy resin is EP, Hot-dip galvanizing is not marked Nominal size 4.2.2 The categories and expression methods of plastic-coated steel pipes are shown in Table 1.5 materials5.1 Base pipe 5.1.1 When welded steel pipe is used as the base pipe, it shall meet the requirements of GB/T 3091. 5.1.2 When the spiral seam submerged arc welded steel pipe is used as the base pipe, it shall meet the requirements of SY/T 5037. 5.1.3 When seamless steel pipes are used as base pipes, they shall meet the requirements of GB/T 8163. 5.2 Flange 5.2.1 The type and size of steel pipe flanges used for the connection of plastic-coated steel pipes should comply with GB/T 9119 or other corresponding standards. 5.2.2 The material and tolerance of steel pipe flanges should meet the requirements of GB/T 9124. 5.3 Polyethylene powder 5.3.1 The properties of the polyethylene powder used for coating should meet the requirements of Table 2. 5.3.2 For each grade of polyethylene powder, a third party with inspection qualification should provide a powder performance inspection report that meets the requirements of Table 2. 5.4 Epoxy powder 5.4.1 The properties of epoxy resin powder used for coating should meet the requirements of Table 3. 5.4.2 For each grade of epoxy resin powder, a third party with inspection qualification shall provide a powder performance inspection report that meets the requirements of Table 4. 5.5 Base pipe processing and surface treatment 5.5.1 The internal burrs of longitudinally welded steel pipes should be cleaned, and the residual height of the internal welding ribs should not be greater than 0.5mm. 5.5.2 Plastic-coated steel pipes with grooves at both ends should be processed on the grooves of the base pipe before plastic coating. After the steel pipes are coated with plastic, the grooves should not be processed. The groove processing should meet the requirements of CJ/T 156. 5.5.3 Plastic-coated steel pipes with sockets at both ends should be processed on the base pipe with sockets and sockets before coating, and their dimensions should meet the requirements of GB/T 13295; The specifications, outer diameter, and wall thickness of the plastic-coated steel pipe base pipe with socket connection should meet the requirements of Table 4. 5.5.4 Plastic-coated steel pipes with flanges at both ends should be welded to the base pipe before plastic coating, and the relevant positions and dimensions after assembly welding should meet the following requirements. a) The axis of the steel pipe should be at right angles to the flange plane, and the allowable error of the angle is ±1° (see Figure 1); b) The offset of the bolt holes corresponding to the flanges at both ends of the same steel pipe to the same centerline b, for pipes of DN500 and below, b< 3mm; for pipes above DN500, b< 5mm (see Figure 2); c) The weld between the end face of the steel pipe and the flange face should be ground into a smooth transition, with a fillet R≥3mm (see Figure 3). 5.5.5 Before the base pipe is coated with plastic, sandblasting or pickling and phosphating must be used to remove rust, oil stains or galvanized surface on the surface of the base pipe. Oxide film, etc., for the base pipe with DN >150, the rust removal level should reach the Sa2.5 level specified in GB/T 8923.1-2009.After treatment, the base pipe The depth of the anchor pattern on the surface should reach 40μm~100μm.6 requirements6.1 Appearance 6.1.1 The inner and outer walls of the plastic-coated steel pipe should be smooth, uniform in color, and free of defects such as scars, pinholes, and foreign bodies attached. 6.1.2 The plastic-coated steel pipe with DN≤150 should be flat and straight for use, or the curvature index shall be specified by the agreement between the supplier and the buyer; the curvature of the plastic-coated steel pipe with DN >150 should not be greater than 0.2% of the full length of the steel pipe; The two end faces should be perpendicular to the pipe axis. 6.1.3 The plastic-coated steel pipe used for welding connection should be removed from the inner and outer coatings of the pipe end, and the reserved length of the pipe end is 100mm~150mm. 6.1.4 The color of the plastic-coated steel pipe coating can be determined through negotiation between the supplier and the buyer. 6.2 Dimensions 6.2.1 The thickness of the inner and outer coatings of the plastic-coated steel pipe shall meet the requirements of Table 5. 6.2.2 The cut-to-length length of the plastic-coated steel pipe with the nominal size not greater than DN150 should be 6m, and the allowable deviation of the total length is 0-20mm; the nominal size When it is larger than DN150, it should be 6m~12m, or it can be delivered according to the fixed length agreed by the supplier and the demander. The allowable deviation is (0~2)% of the order length. 6.3 Thread 6.3.1 Plastic coated steel pipes should not be delivered with threads. 6.3.2 Plastic coated steel pipes can be delivered with threads according to user requirements, and the threads should meet the requirements of GB/T 7306. 6.4 Performance 6.4.1 Inner surface 6.4.1.1 Pinhole test. The inner surface of the plastic-coated steel pipe should be tested with an electric spark detector, and no electric spark is generated. 6.4.1.2 Adhesion. The adhesion of the polyethylene coating should be no less than 30N/cm; the adhesion of the epoxy resin coating should be no less than Grade 3. 6.4.1.3 Bending performance. After the plastic-coated steel pipe with a nominal size not greater than DN50 is bent according to 7.6, the coating should not crack or peel off. 6.4.1.4 Flattening performance. After the plastic-coated steel pipe with a nominal size greater than DN50 is flattened according to 7.7, the coating should not crack or peel off. 6.4.1.5 Impact performance. After the plastic-coated steel pipe is subjected to an impact test according to 7.8, the coating should not crack or peel off. 6.4.1.6 Hygienic performance. The hygienic performance of plastic-coated steel pipes for transporting drinking water shall meet the requirements of GB/T 17219. 6.4.2 Outer surface 6.4.2.1 If the outer surface of the plastic-coated steel pipe is hot-dip galvanized, it shall comply with the requirements for galvanized steel pipe in GB/T 3091. 6.4.2.2 The outer surface of the plastic-coated steel pipe with polyethylene and epoxy resin coating shall be tested according to 7.4 and 7.5, and meet the requirements of 6.4.1.1 and 6.4.1.1. The provisions of 6.4.1.2. 6.4.2.3 The outer surface of the plastic-coated steel pipe is an anti-corrosion layer of other materials (such as two-layer structure, three-layer structure extruded polyethylene anti-corrosion layer) should comply with the relevant current national standards.7 Test method7.1 Appearance The appearance of the plastic-coated steel pipe can be inspected visually and by hand. 7.2 Dimensions 7.2.1 The coating thickness of the plastic-coated steel pipe is measured with an electromagnetic thickness gauge, and any 4 points on the circumference that are orthogonal to the circumference are measured at both ends of the pipe. 7.2.2 The length of the plastic-coated steel pipe is measured with a steel tape with an accuracy of 1 mm. 7.3 Thread Plastic-coated steel pipe threads should be inspected with thread ring gauges in accordance with GB/T 7306. 7.4 Pinhole test Use an electric spark detector to inspect the entire surface of the test tube to detect whether there is electric spark. The voltage value of the pinhole test should meet the requirements of Table 6. 7.5 Adhesion 7.5.1 The determination of the adhesion of the polyethylene coating shall be carried out in accordance with Appendix A. 7.5.2 The adhesion measurement of epoxy resin coating shall be carried out in accordance with Appendix B. 7.6 Bend test 7.6.1 Cut a sample with a length of about 1200mm from any position of the tested plastic-coated steel pipe, and bend it on a pipe bender at room temperature with 8 times the outer diameter of the base pipe without filler. 7.6.2 The bending angle of polyethylene coating is 90°, and the bending angle of epoxy resin coating is 30°. When bending, the weld is located on the outer side of the main surface of the bending. 7.6.3 After the test, cut the test piece from the middle of the curved arc axis to check whether the internal coating has peeling or cracks. 7.7 Flattening test 7.7.1 Cut a sample with a length of about 50mm from any position of the plastic-coated steel pipe to be tested, place it between the two plates at room temperature as shown in Figure 4, and gradually compress it on the tensile testing machine. 7.7.2 For polyethylene coating, the distance between the two plates is controlled to 2/3 of the outer diameter of the sample; for epoxy resin coating, the distance between the two plates is controlled to 4/5 of the outer diameter of the sample. The weld of the plastic steel pipe is perpendicular to the compression direction. 7.7.3 After flattening, observe whether the inner coating has cracks and peeling. Plastic-coated steel pipes with a nominal size greater than DN200 can be replaced by DN150 plastic-coated steel pipes. 7.8 Impact test 7.8.1 Cut a sample with a length of about 100mm from any position of the tested plastic-coated steel pipe, and perform impact according to Table 7 at room temperature as shown in Figure 5 In the test, the weld should be placed in the opposite direction to the impact surface. 7.8.2 After the test, check the inner coating for cracks and peeling. DN150 can be used for plastic coated steel pipes with a nominal size greater than DN200 The plastic-coated steel pipe instead. 7.9 Hygienic performance The sanitary performance test shall be carried out in accordance with GB/T 17219. 7.10 Hot-dip galvanized layer performance The performance test of the hot-dip galvanized layer shall be carried out in accordance with GB/T 3091. 7.11 External surface plastic coating performance The outer surface plastic coating performance test shall be carried out in accordance with 7.4 and 7.5.8 Inspection rules8.1 Factory inspection 8.1.1 Each batch of plastic-coated steel pipes must be inspected by the factory's quality inspection department before leaving the factory. 8.1.2 Batch division Plastic-coated steel pipes should be inspected and accepted in batches, and the number of plastic-coated steel pipes in each batch should not exceed the following regulations. a) DN≤150mm, 1000 pieces; b) 150mm \u003cDN\u003c500mm,500根; c) DN≥500mm, 100 pieces. 8.1.3 The items and sample quantity of the factory inspection shall meet the requirements of Table 8. 8.1.4 When one sample of each inspection item is unqualified, take a double sample for re-inspection. If there is still one unqualified, the batch is unqualified. However, the supplier can inspect the batch one by one and submit it for acceptance as a new batch. 8.1.5 In the product inspection, the diameter of the steel pipe coating is not greater than 25mm, or the diameter is greater than 25mm but the area is less than 250cm2. Quality defects such as missed coating and pinholes are allowed to be repaired. See Appendix C for repairs. 8.2 Type inspection 8.2.1 Type inspection shall be carried out in one of the following situations. a) Trial-making type appraisal of new products or product transfer to factory production; b) When major changes in product design, process and materials may affect product performance; c) When production is resumed after stopping production for more than 1 year; d) Every 2 years of normal production. 8.2.2 The items of the type inspection are all the requirements specified in this standard. 8.2.3 The test pieces for type inspection shall be randomly selected from the qualified products of the factory inspection. 8.2.4 If a sample of any item is found to be unqualified during the in......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of CJ/T 120-2016_English be delivered?Answer: Upon your order, we will start to translate CJ/T 120-2016_English as soon as possible, and keep you informed of the progress. 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