T/CPPIA 3-2020 Dig-resistant anti-impact modified polyvinyl chloride (PVC-M) double-walled corrugated drainage and sewerage pipe material

Scope

Scope: This document specifies the terms, definitions, and symbols, materials, product classification and marking, pipe structure and connection methods, technical requirements, test methods, inspection rules, marking, transportation, and storage for PVC-M double-wall corrugated pipes used for underground drainage and sewage systems. This document applies to double-wall corrugated pipes made from PVC resin as the main raw material, which are physically modified by blending and extrusion molding methods. This document is suitable for unpressurized municipal underground drainage and sewage systems, building external drainage and sewage systems, and agricultural drainage and sewage systems. It can also be used as casing for communication cables. Considering the material's chemical resistance and temperature resistance, it can also be used for unpressurized industrial sewage pipes. Main technical contents: 8.1 Color: The inner and outer layers of the pipes should be uniform in color, generally blue, and other colors can be determined by negotiation between the supplier and the buyer. 8.2 Appearance: 8.2.1 The inner and outer walls of the pipes should not have bubbles, cracks, discoloration lines, or obvious impurities and irregular corrugations. The inner wall of the pipe should be smooth, and the end face of the pipe should be flat and perpendicular to the axis. 8.2.2 The inner and outer walls of the valleys of the pipe should be tightly welded and should not show any separation phenomenon. 8.3 Specifications and dimensions: The pipe specifications can be expressed in nominal sizes DN/ID (inner diameter series) or DN/OD (outer diameter series) (see Tables 3 and 4). 8.3.1 Length: The length of the pipes is generally 6 m, and other lengths can be determined by negotiation between the supplier and the buyer. 8.3.2 Pipe dimensions: - The inner diameter series of the pipes should comply with the requirements of Table 3, and the minimum average inner diameter of the socke

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