There is no specific requirement in the specification for fixing support of air duct at the end of ventilation and air conditioning. How to standardize the construction?
1. Find out the laying position of the boom according to the center line of the air duct. The single hanger is on the center line of the air duct, and the double hangers can be symmetrically installed according to the spacing of the tray screw holes or the center line of the air duct.
2, derrick according to the form of pendant, can be welded on the pendant, can also be hung on the pendant, after welding should be coated with antirust paint.
When the air duct is long and a row of brackets need to be installed, both ends can be installed first, and then the elevation of the middle bracket can be found out according to the drawing method of the brackets at both ends for installation.
3. When installing the riser pipe clamp, fix the top pipe fitting first, and then hang the line in the center with a line hammer. The following pipe clamp can be fixed according to the line.
4. When there is no design requirement for the spacing between supports and hangers of air ducts, the non-thermal air ducts shall meet the requirements in the following table. When there is no design requirement for the spacing between supports and hangers of thermal insulation air duct, multiply the required spacing value by 0.85 according to the following table. The spacing between supports and hangers in the spiral pipe can be appropriately increased.
5, steam-water shall not be installed in the tuyere, valve inspection hole, so as not to interfere with the operation. Hanger shall not be directly hung on the flange.
6. The thermal insulation air duct cannot directly contact with the supports and hangers, and should be padded with solid thermal insulation material with the same thickness as the thermal insulation air duct to prevent "cold bridge".
7. Like the steel plate air duct, the polychloroprene air duct also uses a hanger, but generally the hanger is the main one, but the following points should be achieved: when the branch pipe is long, the end close to the main pipe should be provided with a bracket. The hoop of the bracket should be made to have a certain gap with the air duct to facilitate the expansion and contraction of the air duct.
Extended data
Material requirements for terminal air duct of ventilation and air conditioning:
1, various plates, pipes, etc. There should be quality certification documents (including factory certificate, quality certificate and test report, etc.). ) and product list.
2, duct finished products are not allowed to have defects such as deformation, distortion, cracking, holes, flange loss, missing welding, missing riveting and bolt holes.
3. When installing the valve muffler, valve cover, tuyere and other parts, check whether the adjusting device is flexible and whether the muffler and paint layer are damaged.
4. Materials used for installation: suspenders, bolts, nuts, washers, gaskets, sealing strips, self-tapping screws, rivets, canvas, non-woven fabrics, expansion bolts, etc. Should meet the product quality requirements.
Precautions for air duct installation: When the air duct cannot be connected in blue, the interface should be tight and firm. The four corners of rectangular duct must be positioned and sealed. The two planes of air duct connection shall be straight and shall not be dislocated or twisted. The circular duct installed on the bracket should be equipped with a bracket. A rain cover should be set on the outside of the air duct passing through the roof.
Pipes liable to generate condensed water shall be installed according to the slope required by the design. There can be no longitudinal seam at the bottom of the air duct. If there is a seam, it should be sealed.