GB/T 18997.1-2020Plastic/aluminum/plastic composite pressure pipes—Part 1: Composite pipes overlap-welded by aluminum pipe (English PDF)

Foreword

GB/T 18997 "Aluminum-plastic composite pressure pipe" is divided into two parts.

---Part 1: Aluminum pipe lap welded aluminum-plastic pipe;

---Part 2: Butt-welded aluminum-plastic pipe of aluminum pipe.

This part is Part 1 of GB/T 18997.

This section was drafted in accordance with the rules given in GB/T 1.1-2009.

This part replaces GB/T 18997.1-2003 "Aluminum-plastic composite pressure pipe Part 1: Aluminum pipe lap welded aluminum-plastic pipe", and Compared with GB/T 18997.1-2003, the main technical changes are as follows.

---Modified the scope (see Chapter 1, Chapter 1 of the 2003 edition);

---Modified the content of 3.1, and added the terms of "design temperature", "maximum design temperature", "fault temperature" and "design pressure" Definition, rearranged into Chapter 3 (see Chapter 3, 3.1 in the 2003 edition);

---Modified the content of 3.2, added abbreviations, and reorganized it into Chapter 4 (see Chapter 4, 3.2 in the 2003 edition);

---Added random copolymer polypropylene overlap welding aluminum-plastic pipe and related technical requirements (see Chapter 5 and Chapter 7);

---Modified the classification of lap welded aluminum-plastic pipes (see 5.1, 4.1.2 of the 2003 edition);

---Added the use condition level (see 5.2.1);

---Modified the working conditions of lap-welded aluminum-plastic pipes for cold water and hot and cold water. 5.2.2, 4.1.1 of the 2003 version);

---Modified "long-term working temperature" to "design temperature" and "allowable working pressure" to "design pressure", and modified gas lap welding accordingly The temperature value of the aluminum-plastic pipe, and the classification of compressed air has been added (see 5.2.3, 4.1.1 in the 2003 edition);

---Modified the material requirements for overlap welding aluminum-plastic pipes (see Chapter 6, Chapter 5 of the 2003 edition);

---Modified the technical requirements for aluminum materials, the tensile strength should not be less than 115MPa (see 6.5, 5.4 in the 2003 edition);

---Increase the oxidation induction time, T peel strength, yield strength, and elongation at break requirements of hot melt adhesives (see 6.6);

---Added the color requirements for overlap-welded aluminum-plastic pipes for compressed air and for special fluids (see 7.1);

---Added 2 specifications dn14 and dn18, and increased the thickness tolerance of the aluminum layer of each specification (see 7.3.3);

---Added the minimum thickness requirements of the aluminum layer of each specification of lap welded aluminum-plastic pipes for hot water (see 7.3.3);

---Modified the blasting strength requirements (see 7.7, 6.6 in the 2003 edition);

---Modified the hydrostatic test conditions of polyethylene overlap welded aluminum-plastic pipes, and added the hydrostatic test conditions of polypropylene overlap welded aluminum-plastic pipes (see 7.8, 6.7 in the 2003 edition);

---The requirements for thermal stability under hydrostatic conditions have been added (see 7.9);

---Modified the size group and nominal outer diameter range of the pipe (see 9.2.2, 8.5.4 in the 2003 edition);

---Amended Appendix C, reorganized into Appendix A, and added additional requirements for double-sided hot-melt socket fittings for PPAP pipes (see Appendix A, Appendix C of the 2003 edition);

--- Deleted Appendix D, increased the cyclic pressure shock test method and the vacuum test method (see Appendix D and Appendix E, Appendix D in the 2003 edition).

1 Scope

This part of GB/T 18997 specifies the use of embedded lap welded aluminum pipe as the reinforced metal layer, which is combined with the inner and outer plastic layers by co-extrusion hot melt adhesive. The terms and definitions, symbols and abbreviations, classification, conditions of use and markings of aluminum-plastic composite pressure pipes (referred to as lap welded aluminum-plastic pipes) made of composite materials, Materials, requirements, test methods, inspection rules, signs, packaging, transportation and storage.

This part is applicable to heat-resistant polyethylene overlap-welded aluminum-plastic pipes, cross-linked polyethylene overlap-welded aluminum-plastic pipes and random copolymer polypropylene used in cold and hot water distribution systems.

Polyethylene overlap welded aluminum-plastic pipe is also suitable for cold water, gas, compressed air and special fluid distribution systems whose working temperature is not higher than 40°C. Welded aluminum-plastic pipe and cross-linked polyethylene overlap-welded aluminum-plastic pipe.

Note: Polyethylene overlap-welded aluminum-plastic pipe, heat-resistant polyethylene overlap-welded aluminum-plastic pipe, and cross-linked polyethylene overlap-welded aluminum-plastic pipe are connected by internal sealing mechanically, and random copolymer polypropylene The welded aluminum-plastic pipe adopts double-sided hot-melt socket connection.

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 document.

For undated references, the latest version (including all amendments) applies to this document.

GB/T 228.1 Tensile Test of Metallic Materials Part 1: Room Temperature Test Method

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 2791 Adhesive T peel strength test method flexible material vs. flexible material

GB/T 2828.1 Sampling inspection procedure by attributes Part 1: Batch inspection sampling plan retrieved by acceptance quality limit (AQL)

GB/T 2918 Standard environment for condition adjustment and testing of plastic samples

GB/T 3682.1 Plastic Thermoplastic Melt Mass Flow Rate (MFR) and Melt Volume Flow Rate (MVR) Determination Part 1: Standard Method

GB/T 6111-2018 Determination of internal pressure resistance of thermoplastic piping systems for fluid transportation

GB/T 8806 Plastic piping system plastic parts size determination

GB/T 13663.1 Polyethylene (PE) piping system for water supply Part 1: General

GB/T 15558.1-2015 Buried Polyethylene (PE) Piping System for Gas Part 1: Pipes

GB/T 15560 Plastic pipe hydraulic transient burst and pressure test method for fluid transportation

GB/T 17219 Safety evaluation standard for drinking water distribution equipment and protective materials

GB/T 18474 Cross-linked polyethylene (PE-X) pipe and fittings test method for degree of cross-linking

GB/T 18742.1 Polypropylene piping system for hot and cold water Part 1: General

GB/T 18742.2-2017 Polypropylene piping system for hot and cold water Part 2: Pipes

GB/T 18991 Thermoplastic pipes and fittings for hot and cold water systems

GB/T 18992.1 Cross-linked polyethylene (PE-X) piping system for hot and cold water Part 1: General

GB/T 18992.2 Cross-linked polyethylene (PE-X) piping system for hot and cold water-Part 2: Pipes

GB/T 19278-2018 General terms and definitions for thermoplastic pipes, fittings and valves