When installing the air duct, the construction should be carried out in strict accordance with the drawings. Before the official construction, the schedule should be planned and the construction plan should be formulated in advance, and the technical disclosure should be made to the operators in time. At the same time, the installation and construction of the air duct, in addition to its own work, also need to do a good job of coordination and cooperation with the civil engineering profession, so as to avoid the inconvenience and impact of the cross operation on the pipeline construction. During the installation of the ventilation duct, reinforcement measures must also be taken according to the requirements of the specification. When the diameter of the circular air duct is greater than or equal to 800mm, and the length of the pipe section is greater than 1250mm or the total surface area of u200bu200bthe pipe section is greater than 4m2, a flat steel reinforcement ring is added every 1500mm and fixed with rivets. In order to prevent the bite from cracking during transportation or hoisting, when the diameter of the circular air duct is greater than 500mm, the two ends of the longitudinal bite are fixed with rivets or spot welding. 2. Reinforcement of rectangular air ducts: Compared with circular air ducts, rectangular air ducts have low strength and are prone to deformation. When the length of the large side of the rectangular air duct is greater than or equal to 630mm, the length of the large side of the insulating air duct is greater than 800mm, the length of the pipe section is more than 1250mm, or the flat area of u200bu200bone side of the low-pressure air duct is greater than 1.2m2, and the medium and high pressure air ducts are greater than 1.0m2 , In order to reduce the deformation of the air duct during transportation and installation, reinforcement measures must be taken during production. The method of fireproof wrapping of ventilation ducts Fabric duct ventilation duct 1. If the material of the duct is not fire-resistant, but it may come into contact with open flames, for example, a ventilation duct made of PVC material is erected near the heater, then it is necessary to do fire prevention treatment . 2. If the gas transported by the air duct is flammable and explosive, a fireproof package should be provided. For example, a positive pressure air duct transports exhaust gas with oil fume, and the fireproof package can prolong the tolerance time of the ventilation duct and avoid the burning of the air duct, and a large amount of gas overflow will cause deflagration. 3. If the gas transported by the air duct is sensitive to temperature, it may be that the gas components are sensitive to temperature and are prone to temperature denaturation. At this time, not only should there be constant temperature treatment, but also fire prevention treatment to avoid accidents. 4. If it is exposed to a high temperature and flammable environment, the air duct should generally be treated with fire prevention. Except for the exhaust pipe on the upper part of the stove in the hotel, it is generally made of tin plate, which can be burned by the flames in many cases. Shanghai Jiutian Automation Equipment Co., Ltd
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