The support principle of the ventilation pipe installation and processing system is that the pipe should not be directly supported on the equipment with the valve, and the support or hanger should be set separately. The welding position of the pipe should be in the place where the construction is convenient or the stress is small, and the welding seam should not be located at the support and the distance should not be less than 200 mm.
If the properties of different dust gases are different, the purification process should be different. In the layout of the ventilation pipe processing system, the leakage of the whole system should be small, and the air volume at the suction port should be enough. The layout of ventilation pipe processing system should reduce the resistance.
The circular duct has high strength and less consumables, but the processing technology is more complex and takes up more space; Stainless steel duct is easy to arrange and process, so it is widely used. Shandong ventilation pipe processing is also mechanized production. It is made of spiral steel strip, with round and rectangular shape. In order to save space, a large number of stainless steel air pipes are made into oblong shape.
According to the material, the air duct is generally divided into three categories: galvanized stainless steel air duct, stainless steel air duct and composite stainless steel air duct. Among them, the quality of stainless steel duct is better, the applicability is strong, but the price is high. The stainless steel air duct widely used in shopping malls is galvanized. Galvanized stainless steel duct is basically the characteristics of stainless steel duct, but the price is only two-thirds or even lower than that of stainless steel duct.
The composite stainless steel air duct is generally used in the places where the external environment is general and the requirements for the air duct are not too high. Because the iron sheet is easy to have chemical reaction in various environments, causing corrosion and rust. However, zinc in dry air is almost unchanged. In humid air, a fine basic zinc carbonate film is formed on the surface of zinc. The stainless steel air duct is mainly plated with a layer of zinc on the iron sheet of the air duct to protect the iron sheet. The protective and decorative properties of zinc coating can be improved significantly after passivation, dyeing or coating with light protecting agent.
Ji'nan ventilation pipe processing is made of double layer compound protective layer of insulation layer, and the insulation layer is divided into two categories: foam and glass wool. The duct panels commonly seen in Shandong ventilation ducts are aluminum foil composite phenolic foam board, aluminum foil composite polyurethane foam board, aluminum foil composite extruded polystyrene foam board, thermal insulation glass cotton air duct plate, etc. This kind of air duct is relatively ideal in application performance, with small thermal conductivity, light weight, easy construction, clean and so on. At present, it has been used in many public and civil equipment, including high-rise equipment.