GB/T 18993.5-2020 in English
VALIDChlorinated poly (vinyl chloride)(PVC-C)piping systems for hot and cold water installations—Part 5:Fitness for the purpose of system
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$146.00
《GB/T 18993.5-2020冷热水用氯化聚氯乙烯（PVC-C）管道系统 第5部分：系统适用性》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
Interpretation of the core content of the standard
The application of chlorinated polyvinyl chloride (PVC-C) piping systems in the field of hot and cold water transportation must pass strict system applicability verification. This standard specifies six types of tests that must be carried out under the two methods of solvent bonding and mechanical connection:
| Test items | Key parameters | Judgment criteria |
|---|---|---|
| Internal pressure resistance test | S4 level 1.99MPa/80℃/3000h | No leakage at the connection |
| Thermal cycle test | 20-90℃/5000 cycles | Prestress σt=3.36MPa |
| Vacuum test | -0.08MPa/23℃/1h | Pressure difference≤0.005MPa |
Technological evolution and standard differences
Compared with ISO 15877-5:2009, this standard adds Chapter 5 test methods, and adjusts the following technical parameters:
- Unify the test pressures of each pipe series (S6.3/S5/S4 correspond to 0.6/0.8/1.0MPa respectively)
- Add a clear value of elastic modulus E=2400MPa
- Specify that solvent-bonded components need to be left standing at 80℃ for 4 days
Implementation and application suggestions
Case: A hospital hot water system renovation project selected S5 grade PVC-C pipes, and special attention should be paid to the following:
- According to Table 3, the test pull-out force at 90℃ is calculated as F0=π/4×dn2×0.8MPa
- The pressure cycle test needs to complete 10,000 times of 1.2MPa→0.05MPa alternation
- The vacuum sealing test needs to be carried out at 23±2℃
Key points of the test method
| Test type | Execution standard | Specimen requirements |
|---|---|---|
| Resistance to internal pressure | GB/T 6111-2018 | 3 groups of assemblies containing pipe fittings |
| Thermal cycle | GB/T 19993 | Rigid pipe assembly method |
| Vacuum sealing | ISO 13056 | Pretreatment at 23℃ for 24h |
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