GB/T 39383-2020 in English
VALIDThermoplastics piping systems for underground non-pressure applications—Test method for leaktightness of elastomeric sealing ring type joints
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 39383-2020埋地用无压热塑性塑料管道系统 弹性密封圈接头的密封性能试验方法》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 technical points of this standard are reflected in the three-dimensional test system:
| Test dimension | Parameter setting | Detection index |
|---|---|---|
| Pressure condition | p1(-0.03MPa), p2(0.005MPa), p3(0.05MPa) | Vacuum loss rate≤10% |
| Mechanical deformation | Radial deformation X=10%, Y=5% | Calculated value of clamp ring spacing |
| Angular deviation | α=1°-2°(according to the pipe diameter classification) | Deflection angle maintains stability |
Analysis of key technical requirements
1. Test equipment specifications
The equipment must include:
- End sealing device: avoid generating additional axial force
- Hydraulic/negative pressure system: pressure control accuracy ±5%~10%
- Deformation clamp ring: width is configured according to the pipe diameter classification (100-200mm)
Application case: For DN800 pipes, the socket clamp ring should be selected with a width of 150mm, and the socket deformation should be controlled according to lsp=1000×(1-10%)=900mm
Standard implementation suggestions
1. Key points of sample preparation
- The assembly should include at least one sealing ring joint
- The length of the tubular sample L≥de or 1000mm (whichever is greater)
- State adjustment temperature (23±5)℃
2. Test operation specifications
Stage-by-stage pressure test process:
Negative air pressure test (5min)→Standstill→Low pressure hydraulic pressure (15min)→High pressure hydraulic pressure (15min)
Note: 0° benchmark test must be completed before axial deflection is applied
Background of standard evolution
Main changes of this standard compared with ISO13259:2018:
- Unit of measurement is unified as MPa (original bar)
- Formula variable optimization (X/100→X)
- Example numerical correction (1045mm→1050mm)
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