T/CPPIA 4-2020 Steel-plastics composite reinforced electric heat-melting tape

Scope

Scope: This document specifies the terms and definitions, materials, classification and structure, requirements, test methods, inspection rules, packaging, marking, transportation, and storage of steel-plastic composite reinforced electric heat-fusion tapes (hereinafter referred to as electric heat-fusion tapes). This document applies to polyethylene composite pipes with a nominal pressure of less than or equal to 1.6 MPa, used to transport liquids at 60°C or below, and liquid-solid mixed fluids. Main technical content: 6.1 Appearance 6.1.1 The surface of the electric heat-fusion tape should be smooth and flat, with no defects such as indentations, impurities, bubbles, or holes that affect its use. The cut ends of the electric heat-fusion tape should be regular and flat, and the steel wires should not be loose or protrude from the surface. 6.1.2 The electric heating wire mesh and polyethylene base material should be firmly embedded, with no delamination allowed. The electrodes and electric heating wire mesh should be closely and firmly bonded. 6.2 Color The electric heat-fusion tape is generally black, but other colors can be agreed upon by the supplier and buyer. 6.3 Specifications and dimensions 6.3.1 Width and thickness The width and deviation of the electric heat-fusion tape, its thickness, and the minimum distance from the steel wire mesh to the welded and non-welded surfaces should comply with the requirements of Tables 3 and 4. 6.3.2 Length 6.3.2.1 The length of the connecting electric heat-fusion tape should be determined based on the wrapping length required for the pipe size and connection method used. It can also be agreed upon by the supplier and buyer. 6.3.2.2 The minimum length of the reinforcing electric heat-fusion tape should comply with the requirements of Table 5. 6.4 Electrical resistance of the electric heat-fusion tape 6.5 Physical and mechanical properties The physical and mechanical properties of the electric

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