T/CPPIA 42-2024 Low-pressure drainage with multiple enhanced steel-plastic composite pipes and connectors

Scope

Scope: This document specifies the product classification and connection methods, materials, requirements, inspection rules, marking, packaging, transportation, and storage of low-pressure drainage multi-reinforced steel-plastic composite pipes (hereinafter referred to as "pipes") and fittings, and describes the corresponding test methods. This document is applicable to pipes and fittings used for long-term conveying of media with temperatures ranging from 0°C to 40°C and a maximum working pressure (MOP) not exceeding 0.3 MPa in urban drainage, industrial wastewater discharge, and farmland irrigation. Main technical content: 6. Requirements 6.1 Color: The color of pipes and fittings should be black, or it can be determined by the supplier and purchaser according to their needs. 6.2 Appearance 6.2.1 Appearance of pipes 6.2.1.1 The inner surface of the pipe should be smooth, with no bubbles or visible impurities on the inner and outer walls. The reinforcing ribs should be regular and without exposed steel strips. 6.2.1.2 The cross-section of the cut pipe should be welded and trimmed, with no burrs or exposed steel strips. 6.2.1.3 The outer surface of the pipe should be in a natural shrinkage state, without obvious scratches, bubbles, impurities, or uneven coloration. 6.2.1.4 The spiral steel ribs of the pipe should be arranged evenly and regularly, without steel-plastic separation, cracking, white stress marks (silver lines), or collapse. 6.2.1.5 The end face of the pipe should be perpendicular to the axis, and the secondary-formed pipe ends should be free from delamination, cracking, or air holes. 6.2.1.6 The solder of the pipe's spiral welding seam should be continuous and uniform, with a height difference between the solder and the inner surface of the pipe not exceeding 2.5mm. 6.2.2 Appearance of electric heat-fusion tapes 6.2.2.1 The inner and outer surfaces of the electric heat-fusion tapes should be smooth and flat, without defects affecting their use such as

Development Information

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