CJ/T 111-2018 in English
VALIDSleeve-clipping type brass pipe fitting
- Issued on:2018-11-16
- Implemented on:2019-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$485.00
Introduction
Core changes in the standard revision
| Technical indicators | CJ/T 111-2000 | CJ/T 111-2018 | Range of change |
|---|---|---|---|
| Standard name | Compression-type copper pipe fittings for aluminum-plastic composite pipes | Compression-type copper pipe fittings | Expanded scope of application |
| Thermal cycle test | 690kPa/1000 times | 1.0MPa/5000 times | Pressure↑45% Times↑400% |
| Sealing test | 1.0MPa water pressure | 0.6MPa air pressure | Media change pressure↓40% |
Analysis of key performance indicators
1. Material specification
The standard stipulates that brass HPb59-1 and bronze ZCuSn5Pb5Zn5 are the main materials, and the sealing ring needs to be selected from EPDM rubber (XC7243) or fluororubber (XD7433) according to the medium. It is particularly required that the sealing ring of the gas joint must use the yellow mark.
2. Hydraulic strength requirements
Take DN20 pipe fittings as an example:
- Hydraulic strength: 2.48MPa@60℃ for 10h
- Burst strength: minimum 5.0MPa (16% higher than 2000 version)
- Thermal cycle: 5000 cycles at 20℃↔90℃ at 1.0MPa
Implementation suggestions
Selection considerations
- Gas systems must use compression fittings with yellow sealing rings
- DN≥25mm pipe fittings must ensure a minimum wall thickness ≥2.5mm
- Aluminum-plastic composite pipes must be equipped with plastic isolation gaskets
Key points for installation acceptance
- Pull-out test: DN32 joints must withstand a tensile force of ≥3.8kN
- Air tightness test: 0.6MPa air pressure for 3min without leakage
- Thread inspection: external thread accuracy 6g, roughness Ra3.2
Background of standard evolution
The 2018 version of the standard mainly responds to the following technological developments:
1. Adapt to the application requirements of new plastic pipes such as PEX
2. Improve the reliability indicators of high temperature and high pressure systems
3. In line with international standards such as GB/T 18991-2003
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