The length of spiral air duct can be set according to user needs to reduce the connection between air duct and leakage. In addition, the spiral air duct can be connected by non blue connection, with small leakage. Reducing the leakage can reduce the daily operation cost and energy consumption. The spiral air duct joint is a ring joint, and the strength of the joint is much higher than that of the radial joint. Therefore, the spiral air duct can ensure that the joint is free of cracks under double working pressure. In addition, due to the high strength of spiral duct, the specification also stipulates that the thickness of spiral duct plate can be reduced by 10-15 compared with that of general circular duct plate. At the same time, the distance between the support and hanger of spiral air duct can also be longer than that of general pipeline.
There are many ways to install spiral duct. When ordering, we first decide how to connect, and then decide to buy. The connection method includes flange connection method and socket connection method. When flange connection is adopted for installation, the pipe diameter of air duct and pipe fittings shall be the same. According to the socket test, the size of pipe fittings is slightly smaller than that of spiral air duct fittings. Therefore, the specification of each air duct can be calculated, and the exact length of each air duct can be used during installation without cutting length.
Galvanized sheet spiral air duct is basically the characteristic of spiral air duct, but the price is only two-thirds or even lower than that of spiral air duct. By 2000, according to statistics, the application of spiral pipe in American office buildings and subways had reached. The flange gasket shall be made of air tight, elastic and aging resistant connecting materials, with a thickness of 3-5mm and a width of no less than 10mm. The accuracy of air duct wind speed measurement depends not only on the accuracy of the measuring instrument, but also on the supporting method and reading method of the instrument when using Pitot tube or hot ball anemometer; The vertical installation of pipes shall not exceed 4m, and a single straight pipe shall have at least two fixing points; During construction, brickwork and structural piping shall be installed as required. The embedded parts shall be installed at the connection with the metal air duct, or the civil engineering unit shall be required to cooperate with plugging to ensure tight connection. The tolerance fit of pipes and fittings shall be consistent. The ovality and wall thickness non-uniformity of copper pipe shall meet the product quality standards. At present, many finished parts are used.
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