GB/T 18993.3-2020 in English
VALIDChlorinated poly (vinyl chloride) (PVC-C) piping systems for hot and cold water installations—Part 3:Fittings
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 5 business days
$301.00
《GB/T 18993.3-2020冷热水用氯化聚氯乙烯（PVC-C）管道系统 第3部分：管件》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
Chlorinated polyvinyl chloride (PVC-C) pipe fittings are key components of building hot and cold water piping systems, and their performance directly affects system safety. Compared with the 2003 version, the main technical upgrades of GB/T18993.3-2020 include:
| Technical dimensions | 2003 version | 2020 version | Improvement points |
|---|---|---|---|
| Material requirements | Unspecified recycled material ratio | ≤10% clean recycled material is allowed | Increased environmental protection requirements |
| Socket wall thickness | No special regulations | ≥Nominal wall thickness of pipes of the same specification | Improve connection reliability |
| Testing standards | AQL6.5 | AQL4.0 | Quality requirements increased by 53% |
Details of key technical indicators
1. Material properties
- Density range: 1450-1650kg/m³ (GB/T1033.1 test)
- Vicat softening temperature: ≥103℃ (50N load)
- Light transmittance: ≤0.2% (to prevent algae growth)
2. Hydrostatic strength requirements
Take S5 series pipe fittings as an example, the following tests must be passed:
- 20℃/1h test: 5.47MPa no leakage
- 95℃/1000h test: 1.20MPa no crack
Implementation and application suggestions
1. Selection considerations
- Beige standard color pipe fittings are preferred (non-standard colors require special agreement)
- Check the matching degree between the socket depth of the pipe fittings and the pipe (formula: L≥0.5dn+6mm)
2. Installation quality control
Note for solvent-bonded pipe fittings:
- After assembly, stand at room temperature for ≥20 days or accelerate curing at 80℃ for 4 days
- The socket out-of-roundness deviation is controlled within 0.2-1.0mm (depending on the specification)
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