GB/T 33926-2017 in English
VALIDStainless steel pipe fitting of ring compression
- Issued on:2017-07-12
- Implemented on:2018-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
$359.00
《GB/T 33926-2017不锈钢环压式管件》由TC237（全国管路附件标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Analysis of the core content of the standard
| Technical dimensions | I series (PN≤16) | II series (PN25) |
|---|---|---|
| Applicable media | 9 types of fluids such as drinking water/gas/medical gas | |
| Minimum wall thickness (mm) | 0.6(DN15) | 0.72(DN15) |
| Seal test pressure | 2.5MPa | 3.75MPa |
| Tensile resistance (kN) | 1.98(DN15) | 3.0(DN15) |
Key technical requirements
Material specifications: Fittings must be made of 5 types of stainless steel such as S30408, and the sealing rings must be made of silicone rubber/fluororubber and other materials according to the medium, and the hardness must comply with reference standards such as GB/T 28604.
Ring pressure connectionProcess requirements: Special tools are used to extrude the fittings, sealing rings and pipes, and the socket size tolerance is strictly controlled within the range of ±0.5mm.
Test verification system
- 7 connection performance tests: Including 2500 hot and cold water cycles, 1 million vibration strain tests and other rigorous tests
- Sanitary safety: Pipe fittings for conveying drinking water must pass the GB/T 17219 sanitation evaluation
- Anti-corrosion requirements: Austenitic stainless steel must pass a 240h salt spray test
Implementation suggestions
| Application scenarios | Selection points | Installation precautions |
|---|---|---|
| Gas pipeline | II series pipe fittings are preferred, and the sealing ring material must be oil-resistant | After installation, a 1.05MPa airtightness test must be carried out. |
| Hot water system | Choose S31608 material, and the sealing ring temperature resistance ≥110℃ | A thermal expansion compensation device must be reserved |
Standard Evolution Analysis
This standard systematically regulates the ring pressure connection technology for the first time. Compared with traditional welding/threaded connections:
- Connection efficiency is increased by more than 50%
- Leakage rate is reduced to less than 0.1%
- Seismic performance has been verified by 1 million vibrations
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