Butt welded aluminum plastic composite pressure pipe inspection

Aluminum plastic composite pressure pipes - Part 1: Aluminum pipe lap welded aluminum plastic pipes - Scope 1: This part of GB/T 18997 specifies the terms and definitions, symbols and abbreviations, classification, usage conditions and markings, materials, requirements, test methods, inspection rules and markings, packaging, transportation, and storage of aluminum plastic composite pressure pipes (referred to as lap welded aluminum pipes) made by using embedded lap welded aluminum pipes as reinforced metal layers and composite with inner and outer plastic layers through co extrusion hot melt adhesive. This section is applicable to heat-resistant polyethylene lap welded aluminum plastic pipes, cross-linked polyethylene lap welded aluminum plastic pipes, and random copolymer polypropylene lap welded aluminum plastic pipes used in cold and hot water transmission and distribution systems. It is also applicable to polyethylene lap welded aluminum plastic pipes and cross-linked polyethylene lap welded aluminum plastic pipes used in cold water, gas, compressed air, and special fluid transmission and distribution systems with operating temperatures not exceeding 40 ℃. Note: Polyethylene lap welded aluminum plastic pipes, heat-resistant polyethylene lap welded aluminum plastic pipes, cross-linked polyethylene lap welded aluminum plastic pipes use internal sealing mechanical connections, and random copolymer polypropylene lap welded aluminum plastic pipes use double-sided hot melt socket connections. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 228.1 Metallic Materials Tensile Test Part 1: Room Temperature Test Methods GB/T 1033.1 Plastics - Determination of Density of Non cellular Plastics - Part I: Immersion Method, Liquid pycnometer method and titration method GB/T1040.1 Determination of tensile properties of plastics Part 1: General principles GB/T 1040.2 Determination of tensile properties of plastics Part 2: Test conditions for molded and extruded plastics GB/T 2791 Adhesives T peel strength test method Flexible materials to flexible materials GB/T 2828.1 Sampling inspection procedures by attributes Part 1: Acceptance quality limit (AQL) Batch by batch inspection sampling plan for retrieval GB/T 2918 Standard environment for conditioning and testing of plastic specimens

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