GB/T 19473.2-2020 in English
VALIDPolybutene (PB) piping systems for hot and cold water installations—Part 2:Pipes
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 19473.2-2020冷热水用聚丁烯（PB）管道系统 第2部分：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
Key points of standard update
Main changes of the 2020 standard compared with the 2004 version:
- New PB-R pipe classification and performance requirements
- Extended pipe outer diameter range to 250mm
- Added technical specifications for barrier layer pipes
- Updated static hydraulic strength test method
Product classification and performance
| Type | Characteristics | Applicable temperature | Design stress (MPa) |
|---|---|---|---|
| PB-H | Homopolymer | -20℃~95℃ | 4.30-7.83 |
| PB-R | Copolymer | -20℃~95℃ | 4.13-7.81 |
Key Performance Indicators
Static Hydraulic Strength Requirements
| Test Conditions | PB-H Requirements | PB-R Requirements |
|---|---|---|
| 20℃/1h | 15.5MPa | 15.0MPa |
| 95℃/22h | 6.5MPa | 5.5MPa |
Physical and chemical properties
- Ash content ≤2.0%
- Oxidation induction time ≥15min(220℃)
- Longitudinal shrinkage rate ≤2%
- Oxygen permeability ≤0.32mg/(m²·d)(oxygen barrier tube)
Engineering application suggestions
Selection guide
Select the S value of the pipe series according to the level of use conditions:
- S5 series is recommended for heating system (level 4)
- For high-temperature water supply (level 2), it is recommended to use the S6.3 series.
- For cold water system (level 1), the S10 series can be used.
Construction precautions
- PB-H pipes need to be aged for 120 hours in a 23°C environment before installation.
- The pipe wall thickness should be ≥1.9mm for hot-melt connection.
- The distance between pipe supports should not exceed 1.5m.
Significance of standard implementation
The new version of the standard refines the technical indicators of PB pipes, solves the problem of missing specifications in the old version in terms of barrier layer pipes and large-diameter pipes, and provides a more complete technical basis for building water supply and drainage systems, especially for floor heating systems and high-temperature hot water transportation scenarios.
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