Qingdao common plate flange air ductThe manufacturer believes that the thickness of the steel plate of the exhaust air duct can be determined according to the high-pressure system, and it is clear that the rectangular air duct with thin steel plate flange should not be used for the high-pressure air duct. Then the controversial point comes: whether the air duct of the smoke exhaust system belongs to the air duct of the high-pressure system, and whether the smoke exhaust system can be used for the connection of thin steel plate flanges?

1. Qingdao common plate flange air duct manufacturers believe that the thin steel plate flange connection technology of metal rectangular air duct varies according to different processing forms: flange and pipe wall are integrated, which is called "common plate flange pipe", "impossible flange air duct" or "TDC flange air duct"; The other is "combined flange" air duct (also known as TDF flange). Its thin steel plate flange is made into flange form by special combination flange machine. After cutting according to the length of the air duct, insert the end of the manufactured air duct wall, and then rivet (press) into a whole.

2. Thin steel flange duct (I .e. ordinary flange duct) has been popularized in different regions of the country since 2005. In 2007, the relevant standard process flow and standard atlas "Fabrication and Installation of Thin Steel Plate Flange Duct" 07K133 were formed.

3. Qingdao common plate flange duct manufacturers believe that the manufacturing technology of thin steel flange duct (I. e. ordinary flange duct) is more advanced in China. All kinds of processing procedures are completed by automatic assembly line, with high production efficiency, accurate size and good forming quality. Compared with the traditional angle steel flange duct, it has the advantages of saving steel, simple and fast construction operation, saving construction site area, reducing noise, etc., and has more cost advantages. It is more and more widely used in engineering construction. First of all, it is widely used in civil engineering, and gradually extended to the subway, tunnel, civil aviation engineering and other fields.

　　Qingdao common plate flange air ductThe manufacturer believes that in the traditional air duct connection mode, the flange is generally made of angle iron (so it is also called angle iron flange), and the angle iron tie rod is generally fixed at both ends of the air duct by riveting. After the flanges of the two sections of air ducts are connected, a gasket shall be added in the middle and fixed with bolts. The advantages of angle steel connection are high strength, good stability and sealing, and not easy to deform, but the disadvantages are high cost and low efficiency.

Qingdao common plate flange air duct manufacturers believe that ordinary flanges are mainly connected by angle codes, flange clamps and flanges connected with air ducts. Although this kind of air duct has low cost (reducing the amount of angle steel and the labor of making angle steel flanges), it is not as firm as angle steel flanges in practical application, has large air leakage, and needs to be processed by machine tools. It can hardly be made by hand, and is usually only used for fresh air systems, air conditioning systems, etc. Smoke exhaust system is still the air duct of angle steel flange connection.

　　Qingdao common plate flange air ductThe manufacturer believes that due to the lack of advanced processing equipment in the country in the past few years and not being recognized by the standard, most installation units use angle steel flange connection during the production and installation of the air duct, which consumes a large amount of angle steel, welding rods, bolts, paint and other materials., And a lot of labor; the manufacturing accuracy and work efficiency are low, the production cost is high, and the manufacturing and installation quality of the air duct is not easy to guarantee. With the "Ventilation and Air Conditioning Engineering Construction and Quality Acceptance Code" (GB50243-2002) on the duct can not be flanged, the processing line of ordinary plate flange duct is becoming more and more popular in China.