1. Process requirements 1. The air duct flange is processed by the mold method, and the same type of flange adopts a mold to ensure the interchangeability and dimensional accuracy of the flange; 2. After cutting and straightening, it should be chamfered and punched , and then put it on the corresponding mold, clamp it, and weld it. 3. The allowable deviation of the flange flatness is 1mm, and the difference between the two diagonals of the rectangular flange of the air duct manufacturer should not be greater than 2mm; 4. There must be screw holes at the four corners of the flange, and the bolts and The hole distance of the rivet holes should not be greater than 150mm; the high pressure system should not be greater than 100mm; 5. After the flange is formed, the flange should be straightened, and the welding slag should be cleaned up, and then the welding parts should be painted with two coats of anti-rust paint and one coat of silver powder paint. . 2. Quality control points 1. When cutting the flange angle steel, attention should be paid to make the inner diameter of the welded flange not smaller than the outer diameter of the air duct; 2. The weld of the air duct flange should be well fused and full, without false welding and Holes; 3. The processing arrangement of the screw holes of the flanges of the same specification in the same batch should be consistent and interchangeable; 4. When the anti-corrosion treatment of the air duct flange is performed, the next one should be dried after the previous paint is dried. Anti-corrosion treatment; 5. It is strictly forbidden for unlicensed personnel to perform welding; 3. Protection measures for finished products 1. The semi-finished products and finished products of air duct flanges must be neatly placed on the square wood, and should be classified and stacked according to the specifications and models; 2. Not with other materials, Mix the equipment together, and take measures to prevent rain and snow; 3. When the finished air duct flanges are stacked for a long time, they should be covered with plastic film to keep the surface clean and avoid dust accumulation; 4. Handling should be handled with care, not allowed Destroy the galvanized layer of the flange, if there is any scratch, it should be repaired completely. Air duct installation 1. Process requirements 1. Before installing the air duct, the ventilation air duct should check the drawings with the construction site to check whether it can be installed according to the designed elevation and position; 2. Use infrared positioning and release to ensure that the air duct According to the center line of the air duct, find out the installation position of the hanger, and install the support and hanger; 3. After confirming that the dimensions and angles of each part of the air duct system are accurate, start to assemble and install the air duct. The connection should be straight and not twisted, and the nut of the connecting flange should be on the same side; 4. The gasket between the air duct and the air duct flange should be made of heat-resistant rubber plate with a thickness of 3mm or more, and the gasket should not protrude into the pipe. , it is not suitable to protrude the flange, and the gasket should not contain asbestos and other harmful components, and should be resistant to oil, moisture, acid and alkali corrosion; 5. When installing the air duct, the center line of the air duct must be kept horizontal. Use a spirit level to measure the level; when the length of the air duct exceeds 20m, anti-sway brackets must be installed, and each system should not be less than one pair; Pre-embedded pipes or protective casings are provided, and the thickness of the steel plate is 2mm. Between the air duct and the protective casing, use non-combustible and non-hazardous flexible materials to seal; 7. For the installation of various air duct components and operating mechanisms, first check whether the valve shape and operating mechanism are in good condition, and check the flexibility of action After confirming that the valve is normal in all aspects, the installation direction and position should be correct. There should be at least 350mm of clear space on the side of the valve operating mechanism for operation and maintenance; Should not be larger than 200mm; 8. The support and hanger of the fire and smoke exhaust duct must be set up separately, and the branch pipe, pipeline muffler, muffler elbow, and fire valve must be set up with separate supports and hangers; 9. After the air duct is installed, it should be The system pressure level is checked for tightness. 2. Quality control points 1. It is strictly forbidden to have sundries or other pipelines crossing in the air duct, and cleaning and protection work should be done well; 2. The lower edge and outer edge of the support and hanger and the charged body of the catenary (including the load-bearing cable, the lower feeder, etc. ) The safety distance must be kept greater than 230mm, and it should be implemented in strict accordance with the limit requirements; 3. The connecting bolts should be galvanized bolts, and corresponding flat washers, spring washers and nuts must be provided at the same time; 4. The working temperature of the air duct flange gasket Not less than 70℃; the working temperature of the flange gasket of the exhaust air duct should not be less than 250℃; 5. The allowable deviation of the horizontality of the air duct installation should not be greater than 3mm per meter, and the total deviation should not be greater than 20mm; the vertical installation is vertical The allowable deviation of each meter is not more than 2mm, and the total deviation should not be greater than 20mm; 6. The air duct shall not be provided with an interface when it passes through the wall or floor. When the air duct is installed along the wall or floor, the distance between the wall and floor shall be The spacing should be greater than 150mm; 7. The installation of the electric actuator of the air valve must be reliably fixed, and it is strictly forbidden to place it on the air duct at will; 8. When installing a manual airtight valve, the direction of the arrow on the valve must be consistent with the direction of the shock wave; 9. On-site wind The configuration of pipe joints shall not reduce its effective cross-section; 10. Non-combustible insulation pads should be provided for air-conditioning duct support and hangers to prevent cold bridges, and the insulation pads should be anchored on the cross arm when the support and hanger are made; 11. For the system air ducts For detection, the method of segmented detection and summary analysis shall be adopted. On the basis of strict installation quality management, the inspection of the system air duct is mainly based on the main pipe and the main pipe. When the light leakage method is used to test the tightness of the system, the air duct of the low-voltage system is qualified for every 10m joint with no more than 2 light leakage points, and an average of no more than 16 joints per 100m; The light leakage point is not more than 1, and the average of 100m joint is not more than 8 is qualified.
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