GB/T 35451.2-2018 in English
VALIDPolypropylene(PP)structure-wall piping systems for underground drainage and sewerage—Part 2:Polypropylene spirally enwound structure-wall pipes
- Issued on:2018-12-28
- Implemented on:2019-07-01
- File Format:PDF
- Delivery:Within 1 day
$334.00
《GB/T 35451.2-2018埋地排水排污用聚丙烯（PP）结构壁管道系统 第2部分：聚丙烯缠绕结构壁管材》由TC48（全国塑料制品标准化技术委员会）归口，TC48SC3（全国塑料制品标准化技术委员会塑料管材、管件及阀门分会）执行，主管部门为中国轻工业联合会。
Introduction
Analysis of the core content of the standard
| Technical dimensions | Type A structural wall tube | Type B structural wall tube |
|---|---|---|
| Structural characteristics | Continuous threaded rib cavity structure between inner and outer walls | Smooth inner wall + outer wall spiral ribs |
| Minimum wall thickness (mm) | e5,min≥1.1(DN200) | e4,min≥1.5(DN200) |
| Applicable temperature | Long-term use temperature ≤45℃ | |
Key technical requirements of materials
Polypropylene resin must meet the following requirements:
- PP-B copolymer resin content ≥95%
- Density 895-920kg/m³
- Oxidation induction time ≥20min(200℃)
- MFR grade control (AD grade)
Typical case: When DN800 pipe uses MFR B grade raw material, its welding compatibility is better than that of C grade material.
Mechanical properties
| Test items | SN4 grade requirements | Test method |
|---|---|---|
| Ring stiffness | ≥4kN/m² | GB/T 9647 |
| Impact performance | TIR≤10% | GB/T 14152 |
| Creep ratio | ≤4% | GB/T 18042 |
System sealing test
Three sealing verification methods:
- Low pressure hydrostatic test: 0.005MPa pressure maintenance for 15min
- High pressure hydrostatic test: 0.05MPa pressure maintenance for 15min
- Negative pressure test: -0.03MPa vacuum degree detection
Engineering application tips:For DN≥600mm pipes, it is recommended to use condition C test (with additional 1° angle deviation).
Suggestions for the implementation of the standard
1. Selection basis: Select the ring stiffness grade according to the burial depth load. SN4 is suitable for 3-6m burial depth
2. Construction points:
- MFR difference of welding material ≤1 level
- Socket and spigot matching length ≥85mm
- Ice crystal symbol should be marked during winter construction
3. Acceptance criteria: Reverse bending shall not occur when the deformation of the ring flexibility test is 30%
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