Fabric expansion joints are flexible connectors used in ducting systems to absorb thermal expansion, vibration, and misalignment. They are made from multiple layers of heat-resistant fabrics, such as fiberglass, PTFE, or silicone, and can also include insulating materials and protective coatings. These joints are designed to handle low-pressure applications and are commonly used where metal expansion joints would be too rigid.
| Nominal diameter |
Intemal diameter (mm) |
Outer diameter(mm) | minimum bending radius | maximum working pressure Mpa | ||||
| mm | Inch | corrugated pipe |
With a net cover | static state | dynamic | A net cover | Two layer net cover |
|
| 8 | 1/3 | 8.8 | 13.2 | 14.4 | 50.0 | 110.0 | 15.0 | 20.0 |
| 10 | 2/5 | 11.7 | 16.5 | 17.7 | 65.0 | 145.0 | 15.0 | 20.0 |
| 15 | 3/5 | 13.5 | 19.5 | 21.1 | 80.0 | 180.0 | 15.0 | 20.0 |
| 20 | 4/5 | 20.0 | 27.0 | 28.6 | 120.0 | 270.0 | 10.0 | 15.0 |
| 25 | 1 | 27.0 | 34.5 | 36.1 | 160.0 | 360.0 | 6.3 | 10.0 |
| 32 | 1¼ | 32.0 | 40.0 | 41.6 | 175.0 | 400.0 | 4.0 | 6.3 |
| 40 | 1½ | 39.6 | 52.0 | 53.6 | 225.0 | 510.0 | 4.0 | 6.3 |
| 50 | 2 | 49.7 | 62.0 | 63.6 | 280.0 | 640.0 | 3.0 | 5.0 |
| 65 | 2½ | 61.2 | 80.2 | 81.8 | 410.0 | 915.0 | 3.0 | 5.0 |
| 80 | 3 | 79.0 | 96.3 | 97.9 | 486.0 | 1030.0 | 3.0 | 5.0 |
| 100 | 4 | 101.2 | 119.6 | 121.2 | 610.0 | 1340.0 | 2.5 | 4.0 |
| 125 | 5 | 124.1 | 145.3 | 146.9 | 700.0 | 1540.0 | 2.5 | 4.0 |
| 150 | 6 | 149.4 | 180.8 | 182.4 | 810.0 | 1780.0 | 2.5 | 4.0 |
| 200 | 8 | 176.0 | 240.0 | 243.2 | 1000.0 | 2000.0 | 2.5 | 4.0 |
| 250 | 10 | 248.0 | 290.0 | 294.0 | 1250.0 | 2500.0 | 2.5 | 4.0 |
| 300 | 12 | 298.0 | 350.0 | 354.0 | 1500.0 | 3000.0 | 1.6 | 2.5 |
| 350 | 14 | 347.0 | 400.0 | 404.8 | 1750.0 | 3500.0 | 1.6 | 2.5 |
| 400 | 16 | 397.6 | 460.0 | 464.8 | 2000.0 | 4000.0 | 1.6 | 2.5 |
1.Flexibility: Fabric expansion joints provide excellent flexibility, accommodating large movements in multiple directions, including axial, lateral, and angular movements.
2.High Temperature and Corrosion Resistance: Made from high-temperature-resistant and chemically-resistant fabrics, they are suitable for harsh environments, such as handling hot gases or corrosive fumes.
3.Lightweight and Easy to Install: Their lightweight design makes them easy to install and replace, with minimal support required compared to metal expansion joints.
4.Noise and Vibration Dampening: The fabric layers help in reducing noise and absorbing vibrations, contributing to a quieter and more stable system.
Fabric expansion joints are widely used in industries such as power generation, petrochemical, cement, steel, and paper mills. They are typically installed in air and flue gas duct systems, exhaust systems, and gas turbine systems. Their primary function is to compensate for thermal expansion, vibrations, and misalignment in ducts and to protect against leakage and mechanical stress.
