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GB/T 28897-2021 English PDF

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GB/T 28897-2021: Steel-plastic compound pipes and fittings for fluid service
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GB/T 28897: Evolution and historical versions

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GB/T 28897-2021English859 Add to Cart 7 days [Need to translate] Steel-plastic compound pipes and fittings for fluid service Valid GB/T 28897-2021
GB/T 28897-2012English799 Add to Cart 4 days [Need to translate] Steel pipes of complex plastic Obsolete GB/T 28897-2012

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Basic data

Standard ID GB/T 28897-2021 (GB/T28897-2021)
Description (Translated English) Steel-plastic compound pipes and fittings for fluid service
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H48
Word Count Estimation 46,493
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 28897-2021: Steel-plastic compound pipes and fittings for fluid service

---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.
(Steel-plastic composite pipes and fittings for fluid transportation) ICS 77.140.75 CCSH48 National Standards of People's Republic of China Replace GB/T 28897-2012 Steel-plastic composite pipes and fittings for fluid transportation Released on 2021-05-21 2021-12-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅰ 1 Scope 1 2 Normative references 1 3 Terms and definitions 2 4 Classification and code 3 5 Ordering content 4 6 Size, weight and allowable deviation 4 7 Technical requirements 7 8 Test method 12 9 Inspection rules 14 10 Packaging, marking, quality certificate, transportation and storage 14 Appendix A (informative) Maximum working pressure and maximum working temperature of steel-plastic pipe 16 Appendix B (Normative) Plastic-lined pipe fittings 17 Appendix C (normative) Grooved pipe connection 24 Appendix D (normative) Thermal characteristic test of epoxy powder 30 Appendix E (Normative) Test Method for Peeling of Plastic Coating 32 Appendix F (Normative) Method for determination of adhesion of polyethylene coating 34 Appendix G (Normative) Test method for adhesion of epoxy resin coating 36 Appendix H (Normative) Impact Test Method for Plastic Coating 37 Appendix I (Normative) Corrosion resistance test methods of plastic-lined pipe fittings 38 Appendix J (Normative) Resistance to cold and heat cycle test of plastic-lined pipes 40 References 42 Steel-plastic composite pipes and fittings for fluid transportation

1 Scope

This document specifies the classification and code, order content, size, weight and allowable deviation, technology of steel-plastic composite pipes and pipe fittings for fluid transportation Requirements, test methods, inspection rules, packaging, marking, quality certificates, transportation and storage. This document applies to steel-plastics that transport drinking water, hot and cold water, drainage, rainwater, fire-fighting water, air-conditioning water, compressed air and other media. Composite pipe (hereinafter referred to as steel-plastic pipe) and pipe fittings. Note. Refer to Appendix A for the applicable delivery pressure and medium temperature of various steel-plastic composite pipe piping systems.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all change orders) is applicable to This document. GB/T 241 Metal pipe hydraulic test method GB/T 244 Bend test method for metallic material pipe GB/T 246 Test method for flattening of metallic material pipes GB/T 1033.1 Determination of the density of plastic non-foam plastics 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 1040.2 Determination of tensile properties of plastics Part 2.Test conditions for molding and extrusion plastics GB/T 1633 Thermoplastics Determination of Vicat Softening Temperature (VST) GB/T 1732 Test Method for Impact Resistance of Paint Film GB/T 2102 Acceptance, packaging, marking and quality certificate of steel pipe 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 3287-2011 malleable cast iron pipe connection GB/T 4472 Determination of density and relative density of chemical products GB/T 4956 Magnetic method for measuring the thickness of non-magnetic coatings on magnetic substrates GB/T 5135.20 Automatic Sprinkler System Part 20.Coated Steel Pipe GB/T 5267.3 Hot-dip galvanized layer of fasteners GB/T 5721 General provisions for marking, packaging, transportation and storage of rubber seal products GB/T 6554 Resin-based reactive compounds for electrical insulation Part 2.Test methods for electrical application of powder coating method GB/T 6742 Paint and varnish bending test (cylindrical shaft) GB/T 7306.1 55° Sealed Pipe Thread Part 1.Cylindrical Internal Thread and Conical External Thread GB/T 7306.2 55° Sealed Pipe Thread Part 2.Conical Internal Thread and Conical External Thread GB/T 8163 Seamless steel pipe for conveying fluid GB/T 8923.1-2011 Visual assessment of surface cleanliness of steel surface treatment before coating-Part 1.Uncoated The corrosion level and treatment level of the steel surface and the steel surface after the original coating has been completely removed GB/T 9124.1 Steel pipe flange Part 1.PN series 3.6 Maleableiron fittingsofliningplastic The malleable cast iron pipe is lined with an injection molding process with a plastic core connected by the interface core (3.7) and the lining plastic layer. Accessories. Note. Referred to as plastic-lined pipe fittings. 3.7 Interfacecore The part in the plastic core of the plastic-lined pipe fitting that is connected with the (lined) plastic-coated composite steel pipe nozzle and prevents the pipe end from being corroded by contact with water. 3.8 Grooved pipe fittings Pipe joints and pipe fittings used for pipe groove connection. Note. Grooved pipe joints refer to quick-assembled joints composed of split clamps, rubber seals and fasteners; grooved pipe fittings are mainly grooved connections The general term for pipe fittings such as elbows, tees, crosses, and reducers used in piping systems.

4 Classification and code

4.1 Classification and code of steel-plastic pipe 4.1.1 The classification and code of steel-plastic pipes according to the composite process of the inner and outer anticorrosive layers are as follows. a) Plastic-lined composite steel pipe, codenamed SP-C; b) Plastic coated composite steel pipe, codenamed SP-T; c) Composite steel pipe covered with plastic, codenamed SP-F. 4.1.2 The steel-plastic pipes are classified as follows according to the conveying water. a) The plastic material color of steel-plastic pipes for cold water and steel-plastic pipes for drinking water should be white or blue; steel-plastic pipes for rainwater or other drainage The color of the plastic material of the tube shall be negotiated between the supplier and the buyer; b) The color of the plastic material of the steel-plastic pipe for hot water should be red; c) The color of the plastic material of the steel-plastic pipe for fire fighting water should be red. 4.1.3 The classification and codes of steel-plastic pipes according to lining, coating and plastic coating materials are as follows. a) Polyethylene, codenamed PE; b) Heat-resistant polyethylene, codenamed PE-RT; c) Cross-linked polyethylene, codenamed PE-X; d) Polypropylene, codenamed PP; e) Rigid polyvinyl chloride, codenamed PVC-U; f) Chlorinated polyvinyl chloride, codenamed PVC-C; g) Epoxy resin, codenamed EP. 4.1.4 The product mark of the steel-plastic pipe is composed of the code of the composite process of the anti-corrosion layer, the code of the material of the plastic layer and the nominal size. Example 1. The plastic-lined composite steel pipe with nominal size of DN100 and lined with chlorinated polyvinyl chloride is marked as. SP-C-(PVC-C)-DN100. Example 2. The plastic-coated composite steel pipe with nominal size of DN80 and epoxy resin coated is marked as. SP-T-(EP)-DN80. Example 3. The plastic-coated composite steel pipe with nominal size of DN50 and plastic-coated polyethylene is marked as. SP-F-(PE)-DN50. Example 4. The steel-plastic pipe with nominal size of DN100, lined with chlorinated polyvinyl chloride and coated with plastic polyethylene, is marked as. SP-C-(PVC-C)-F-(PE)-DN100. 4.2 Classification and code of pipe fittings 4.2.1 Steel-plastic composite pipe fittings are classified as follows according to the internal and external anti-corrosion layer composite process. a) Plastic-lined pipe fittings; b) Plastic-coated pipe fittings; c) Covered with plastic pipe fittings. 4.2.2 The classification and code of steel-plastic composite pipe fittings according to lining, coating and plastic coating materials are as follows. a) Polyethylene, codenamed PE; b) Heat-resistant polyethylene, codenamed PE-RT; c) Cross-linked polyethylene, codenamed PE-X; d) Polypropylene, codenamed PP; e) Rigid polyvinyl chloride, codenamed PVC-U; f) Chlorinated polyvinyl chloride, codenamed PVC-C; g) Epoxy resin, codenamed EP. 4.2.3 The classification and code of steel-plastic composite pipe fittings according to the connection mode are as follows. a) The classification and code of plastic-lined pipe fittings should meet the requirements of Appendix B; b) The classification and code of grooved pipe joints should meet the requirements of Appendix C; c) The classification and code of steel butt-welded pipe fittings should meet the requirements of GB/T 13401 and GB/T 12459; d) For other connection methods, the classification and code of pipe fittings should meet the requirements of the corresponding product standards.

5 Order content

The contract or order for ordering steel-plastic pipes and pipe fittings according to this document should at least include the following. a) The number of this document; b) Base management file number; c) Product name; d) Steel-plastic pipe and (or) plastic layer material of pipe fittings; e) The grade of the base pipe steel; f) The execution file number of the pipe fitting matrix; g) Pipe fitting specifications; h) Steel-plastic pipe specifications (outer diameter × wall thickness or nominal size × wall thickness); i) The quantity ordered; j) manufacturing process; k) Special requirements. 6 Size, weight and allowable deviation 6.1 Steel plastic pipe 6.1.1 Base pipe size and allowable deviation The size and allowable deviation of the base pipe shall comply with the requirements of the documents implemented by the base pipe. 6.1.2 Length 6.1.2.1 Normal length The usual length of steel-plastic pipe is 3000mm~12000mm. 6.1.2.2 Cut-to-length length The cut-to-length length of the steel-plastic pipe is generally 6000mm or 12000mm. When the nominal size is not greater than DN200, its allowable deviation It is 150 mm; when the nominal size is greater than DN200, the allowable deviation is 500 mm. 6.1.2.3 Range length Steel-plastic composite seamless steel pipes can be supplied in a range of lengths, and the range length should be within the usual length range. 6.2 Fittings 6.2.1 The size and shape of plastic-lined pipe fittings should meet the requirements of Appendix B. 6.2.2 The size and shape of the grooved pipe connection shall meet the requirements of Appendix C. 6.2.3 The size, tolerance and shape of butt-welded pipe fittings should meet the requirements of GB/T 12459.The outer diameter series of pipe fittings should be selected in accordance with the outer diameter of the pipe. The diameter series are the same or determined through negotiation between the supplier and the demander. 6.3 Plastic layer of steel-plastic pipes and fittings 6.3.1 The thickness and allowable deviation of the plastic layer of the plastic-lined composite steel pipe and the plastic-coated composite steel pipe shall meet the requirements of Table 1. 6.3.2 The minimum thickness of the plastic layer of the plastic-coated composite steel pipe shall meet the requirements of Table 2. Table 1 The thickness and allowable deviation of the plastic layer of the plastic-lined composite steel pipe and the plastic-coated composite steel pipe are millimeters

Appendix D

(Normative) Thermal characteristics test of epoxy powder D.1 Principle Under the program control temperature, the relationship between the power difference (such as in the form of heat) input to the sample and the reference substance and the temperature is measured. Differential scan The curve recorded by the calorimeter is called the DSC curve, which is based on the rate at which the sample absorbs or releases heat, that is, the heat flow rate dH/dt (unit mJ/sec) as the vertical position. Mark, with temperature T or time t as the abscissa, used to determine the glass transition temperature Tg and heat of reaction ΔH of epoxy powder. D.2 Test instruments and tools D.2.1 Differential scanning calorimeter (DSC instrument) with refrigeration equipment. D.2.2 Analytical balance, accurate to 0.1mg. D.2.3 Specimen sealer. D.2.4 Aluminum sample cuvette with lid. D.3 Test procedure D.3.1 Take (10±1) mg of epoxy powder as a sample, put it into the pre-weighed sample cuvette, close the lid, seal the sample, and weigh it. The mass is accurate to 0.1mg. D.3.2 Put the sample and reference into the measuring cell of the differential scanning calorimeter protected by dry inert gas. D.3.3 Complete its thermal scan according to the following operating procedures. a) Heat the sample at a rate of 20°C/min, from (25±5)°C to (70±5)°C, then quench the sample to (25±5)°C 5)℃; b) Heat the same sample at a rate of 20°C/min, from (25±5)°C to (285±10)°C, and then quench the sample to (25±5)℃; c) Heat the same sample at a rate of 20°C/min, from (25±5)°C to (150±5)°C. D.4 Test results Correspond to each thermal scan line obtained in b) and c) in D.3.3, determine its corresponding Tg value, these values are extrapolated at the low temperature end At the intersection of the baseline and the tangent at the turning point of the curve. In addition, determine the corresponding reaction heat ΔH (see Figure D.1).

Appendix G

(Normative) Test method for adhesion of epoxy resin coating G.1 Principle After the epoxy resin coated composite steel pipe sample is soaked in high temperature hot water, the surface coating of the sample is peeled off with a suitable tool. The size of the coating area evaluates the adhesion performance of the coating. G.2 Test instruments and tools G.2.1 Beaker with a diameter of more than 100mm. G.2.2 A thermometer with a range of 100°C. G.2.3 A cutter that can cut through the plastic layer. G.2.4 Surface thermometer with minimum scale not greater than 1℃. G.3 Sample The sample should be a part of a straight plastic-coated tube, the length of the sample is about 100mm, and it should be longitudinally cut along the axis; if a test plate is used instead, The length of the test panel is 100mm, and the width of the test panel is 50mm. For epoxy resin composite steel pipes with a nominal diameter of not less than DN200, available DN150 steel pipes of the same material and coating process can be used instead of testing, and the same coating process can also be used on steel plates of the same material and thickness. Art’s test board is used to make samples instead. G.4 Test procedure G.4.1 Put the sample into the beaker, and add distilled water to the beaker to completely immerse the sample. G.4.2 Heating to (75±3)℃ for 4.8h or heating to (95±3)℃ for 24h, then take out the sample. G.4.3 When the sample is still warm, immediately use a knife to scratch a rectangle of about 15mm×30mm on the coating, and the knife mark should penetrate the coating. It reaches the base tube and then cools to room temperature naturally in the air. G.4.4 Within 1h after taking out the sample, insert the tip of the knife under the coating from any corner of the rectangle, and peel off the coating with horizontal force. Push the tip of the knife until the coating inside the rectangle is all pried off or the coating shows obvious pry resistance. G.5 Evaluation of results 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 has been pried off is greater than 50%, but the coating shows obvious prying 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 I (Normative) Test method for corrosion resistance of plastic-lined pipe fittings I.1 Principle This method uses NaCl solution to accelerate the corrosion of the joints of the plastic-lined pipe fittings composing the pipeline system, and judges that the plastic layer of the plastic-lined pipe fittings blocks the transmission The index of the ability of the conveying medium to contact iron. I.2 Test equipment I.2.1 Atomic absorption spectrophotometer. I.2.2 Iron hollow cathode lamp. I.2.3 Acetylene cylinder or acetylene generator. I.2.4 Air compressors should be equipped with water removal, oil removal and dust removal devices. I.2.5 General laboratory glass and plastic utensils. I.3 Specimen I.3.1 Plastic-lined pipe fittings. DN20 outer joints, 2 in number. I.3.2 Lined (coated) plastic steel pipe. 4 sections of DN20 lined (coated) plastic steel pipe, the length of the short pipe is 600mm. For other specifications of steel and plastic pipes, pipes The length of the segment is determined when the internal volume of the assembled component exceeds 300mL. According to the requirements of GB/T 7306.2, pipe threads are processed at one end of the pipe. I.3.3 The rubber sealing ring or pipe thread anaerobic sealant that meets the requirements of this document. I.4 Sample assembly I.4.1 The two sections of lined (coated) plastic steel pipe are a group, the thread length of one group is the standard length, and the other group is the standard length minus 2 teeth. I.4.2 As shown in Figure I.1, assemble two sets of sample groups according to the normal construction requirements. I.4.3 Thread sealing adopts raw PTFE tape.

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