Application Analysis of Installation Level of Galvanized Spiral Duct in Dongguan
1. The galvanized spiral duct in Dongguan is installed horizontally, the diameter or long side dimension is less than or equal to 400mm, and the spacing should not be greater than 4m; greater than 400mm, and not greater than 3m. The distance between the supports and hangers of the spiral galvanized spiral air duct can be extended to 5m and 3.75m respectively. For the galvanized spiral air pipes with thin steel plate flanges, the distance between the supports and hangers should not be greater than 3m.
2. The galvanized spiral air duct shall be installed vertically, the distance shall not be greater than 4m, and a single straight pipe shall have at least 2 fixing points.
3. The galvanized spiral duct support and hanger should be selected according to the national standard atlas and specifications in accordance with the strength and stiffness of the form and specifications. For galvanized spiral ducts in Dongguan, the support and hangers for special galvanized spiral ducts with diameters or side lengths greater than 2500mm shall be designed according to design requirements.
4. Supports and hangers should not be installed at the air vent, valve, inspection door and automatic control mechanism, and the distance from the air vent or plug pipe should not be less than 200mm.
5. When the length of the main and dry galvanized spiral ducts suspended horizontally exceeds 20m, a fixed point to prevent swing should be set, and each system should not be less than one.
6. The screw holes of the hanger should be machined. The boom should be straight, with complete and smooth threads. After installation, the forces of the sub-braces and hangers should be uniform without obvious deformation.
The amount of tension or compression of the adjustable vibration isolation support and hanger used in galvanized spiral duct or air conditioning equipment shall be adjusted according to the design requirements.
7, hoop bracket, the angle should be straight, hoop should be close to and hoop galvanized spiral duct.