T/CPPIA 14-2021 Installing self-locking PE woven solid pipe for dǐng lā usage

Scope

Scope: This document specifies the terms and definitions, symbols, abbreviations, materials, interface forms, requirements, test methods, inspection rules, marking, packaging, transportation and storage, as well as installation requirements for self-locking polyethylene wrapped solid-wall pipes used for top-pull installation. This document is applicable to polyethylene wrapped solid-wall pipes used for conveying media with a temperature not exceeding 45 °C in construction, municipal, rail transit, and other projects, and laid using top-pull or traditional excavation methods. Main technical content: 6.1 Color: Pipes are generally black, and other colors can be determined by mutual consultation between the supplier and the buyer. 6.2 Appearance: The inner and outer surfaces of the pipes should be clean, with clear and regular patterns. Defects such as air bubbles, obvious scratches, indentations, impurities, and uneven color are not allowed. The ends of the pipes should be cut flat and perpendicular to the pipe axis. 6.3 Geometric dimensions: 6.3.1 Effective length: The effective length (L) of the pipes is generally 0.5 m, 1 m, or 6 m, and can also be determined by mutual consultation between the supplier and the buyer. The schematic diagram of the effective length is shown in Figure 3. There should be no negative deviation in the effective length. 6.3.2 Average inner diameter, wall thickness, outer diameter eccentricity, and minimum engagement depth: The average inner diameter, wall thickness, outer diameter eccentricity, and minimum engagement depth of the pipes should comply with the provisions of Table 2. 6.4 Physical and mechanical properties: The physical and mechanical properties of the pipes should comply with the provisions of Table 3. 6.5 System applicability: The system applicability should comply with the requirements of Table 4.

Development Information

Related Standards