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CJ/T 120-2016: Coating plastic steel pipe for water supply
Status: Valid CJ/T 120: Evolution and historical versions
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Coating plastic steel pipe for water supply
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PDF similar to CJ/T 120-2016
Basic data | Standard 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Count Estimation | 17,158 | | Date of Issue | 2016-01-27 | | Date of Implementation | 2016-07-01 | | Older Standard (superseded by this standard) | CJ/T 120-2008 | | Regulation (derived from) | Ministry of Housing and Urban-Rural Development Announcement No. 1037 of 2016; Industry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 contents
Preface 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 13
Foreword
This 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 pipe
1 Scope
This 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 references
The 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 pipeline
3 Terms and definitions
The 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 marking
4.1 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 materials
5.1 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 requirements
6.1 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 method
7.1 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 rules
8.1 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 inspection, a double sample shall be taken to re-inspect the unqualified item. If there are still unqualified after re-inspection, the type inspection shall be deemed unqualified.
9 Marking, packaging, transportation and storage
9.1 Logo
The outer wall of the qualified plastic-coated steel pipe shall be marked with the product mark, the name of the manufacturer, and the standard number of the product.
9.2 Packaging
9.2.1 The plastic-coated steel pipes of straight pipes are packed in hexagonal bundles. Plastic caps or other protective measures should be worn at both ends of the pipes before bundling.
9.2.2 There should be a certificate of conformity at both ends of each bundle of products. The certificate of conformity should have the following content. product name, specification, quantity, standard number, production date, inspection mark, manufacturer name, address and telephone number.
9.2.3 Plastic-coated steel pipes with DN≥300 are not bundled, and the outer plastic coating should be packed with a protective layer. Protective sleeves should be worn on both ends of the welded plastic-coated steel pipe with flanges.
9.3 Transportation
Plastic-coated steel pipes should be transported and loaded with measures to prevent the outer coating from scratching. After loading, they should be bound firmly to prevent severe impacts during transportation. They should not be thrown during loading and unloading. Nylon straps should be used for lifting.
9.4 Storage
9.4.1 Plastic-coated steel pipes should be stored straight indoors, and the distance from the heat source should not be less than 1m. When storing in the open air, it must be covered with a canopy. It should not be stored in a place exposed to direct sunlight and severe cold for a long time.
9.4.2 The ambient temperature during storage of plastic-coated steel pipes is -30℃~45℃. When plastic-coated steel pipes with outer plastic coating are stacked, the bottom should be
Use two support pads, the width of the support pad is 100mm. The plastic-coated steel pipe should be no less than 100mm from the ground, and a flexible spacer should be placed between the support pad and the plastic-coated steel pipe and the plastic-coated steel pipe.
9.4.3 The number of stacked layers shall meet the requirements of Table 9.
Appendix A
(Normative appendix)
Determination of adhesion of polyethylene coating
A.1 Equipment required for this test
A.1.1 Spring dynamometer; the minimum scale is 1N.
A.1.2 Steel ruler. the minimum scale is 1mm.
A.1.3 General purpose knife.
A.2 Selection of test fittings
Cut a 100mm long pipe section from the pipe to be tested. When testing the adhesion of the inner coating, it must be divided into two from the axial direction.
A.3 Test procedure
A.3.1 At room temperature, use a sharp knife to cut two cracks on the coating with a width of 10 mm along the pipe axis as shown in Figure A.1, as deep as the surface of the base pipe.
A.3.2 Lift up one end, do not damage the coating, use a spring dynamometer to gradually pull it down to 180°, and observe the force when the coating peels off. It is qualified if it is greater than 30N.
If the coating breaks during the pulling process, it shall be deemed that the adhesion meets the requirements.
Appendix B
(Normative appendix)
Determination of adhesion of epoxy resin coating
B.1 Instruments required for this test
B.1.1 Beaker. The caliber is above 100mm.
B.1.2 Thermometer. measuring range 100℃.
B.1.3 Knife.
B.2 Selection of test fittings
Cut a 100mm long pipe section from the pipe to be tested, and divide it into two from the axial direction when testing the adhesion of the inner coating.
B.3 Test procedure
B.3.1 Put the test piece into the beaker, add enough water to fully submerge the test piece, and heat to 75℃±3℃ for at least 48h or to
95℃±3℃ after at least 24h, then take out the test piece.
B.3.2 When the test piece is still warm, immediately use a knife to mark a rectangle of about 15mm×30mm on the coating, and the knife mark should penetrate the coating.
After reaching the base tube, it will be naturally cooled to 20℃±3℃ in the air. Insert the tip of the knife from any corner of the rectangle within 1h after taking out the test piece
Under the coating, peel off the coating with a horizontal force, and continuously push the tip of the knife until the coating in the rectangle is all pried off or the coating shows obvious pry resistance.
B.3.3 Evaluate the adhesion level of the rectangular inner coating according to the following classification standards.
a) Level 1-the coating obviously cannot be peeled off by prying;
b) Level 2-the coating being pried off is less than or equal to 50%;
c) Level 3---The coating that is pried off is greater than 50%, but the coating shows obvious pry resistance;
d) Level 4-the coating is easily peeled off into strips or large pieces;
e) Level 5-the coating is peeled off as a whole piece.
Appendix C
(Informative appendix)
Repair of Coating Defects of Plastic-coated Steel Pipe
C.1 Cleaning up defective parts
C.1.1 Remove the loose coating, rust and dirt on the defective part;
C.1.2 Polish the coating around the defective part into a rough surface;
C.1.3 Use a dry cloth or brush to remove the dust.
C.2 Repair operation
C.2.1 For polyethylene coating, the...
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