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The insulation Spiral Duct Machine
According to the National Standard GB30-64, the spiral duct diameter of 80mm, 100mm, 125mm, 175mm, 200mm etc, except 80mm, other size can choose the larger diameter duct as the outer duct, the insulation thickness is 12.5mm to prevent making other diameter's mould.
To prevent condensate of the spiral duct surface, the minimum thickness of the insulation will be like below table.
| Diameter(mm) | Thickness(mm) | Pitch(mm) | Ribbing(mm) | Insulation (mm) |
|---|---|---|---|---|
| D | t | P | W | T |
| 100 | 0.5 | 118 | 8 | 12.5 |
| 125 | 0.5 | 118 | 8 | 12.5 |
| 150 | 0.5 | 118 | 8 | 12.5 |
| 175 | 0.5 | 118 | 8 | 12.5 |
| 200 | 0.5 | 118 | 8 | 12.5 |
| 225 | 0.5 | 118 | 8 | 12.5 |
| 250 | 0.5 | 118 | 8 | 12.5 |
| 275 | 0.5 | 118 | 8 | 12.5 |
| 300 | 0.6 | 100 | 10 | 25 |
| 325 | 0.6 | 100 | 10 | 25 |
| 350 | 0.6 | 100 | 10 | 25 |
| 375 | 0.6 | 100 | 10 | 25 |
| 400 | 0.6 | 100 | 10 | 25 |
| 425 | 0.6 | 100 | 10 | 25 |
| 450 | 0.6 | 100 | 10 | 25 |
| 475 | 0.8 | 100 | 10 | 25 |
| 500 | 0.8 | 100 | 10 | 25 |
| 525 | 0.8 | 100 | 10 | 25 |
| 550 | 0.8 | 100 | 10 | 25 |
| 575 | 0.8 | 100 | 10 | 25 |
| 600 | 0.8 | 100 | 10 | 50 |
| 650 | 0.8 | 100 | 10 | 50 |
| 700 | 0.8 | 100 | 10 | 50 |
| 750 | 0.8 | 100 | 10 | 50 |
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