Relevant knowledge and details of installation of fabric duct ventilation duct engineering (2)

Relevant knowledge and details of the installation of fabric air duct ventilation duct engineering (2) Distinguish by use: the current oil fume purification technology has its own characteristics, as long as it meets the relevant sales standards and obtains the passing inspection and confirmation of the testing part, it should be recommended. . Any technology needs to be supported by a certain market before it can be continuously improved and advanced. 1. Air duct for purification air-conditioning system: galvanized sheet, fabric air duct; (FRP and composite materials that may cause dust pollution in use are prohibited) 2. Air duct for central air-conditioning system: galvanized sheet, color steel insulation board; (Fiberglass, composite materials can be used) 3. Air duct for environmental control system: galvanized sheet, fabric air duct; (plastic, fiberglass, composite material can be used) 4. Air duct for industrial ventilation system: steel sheet, galvanized sheet ; (Libo ventilation pipe. Plastic, glass fiber reinforced plastic and composite materials can be used) Note: FRP ventilation pipe can be divided into two types: organic and inorganic. According to the imaginary standard, there is a prohibited amount of organic material required for fire protection; 5. Air pipe for special application places: Mine coated air ducts, mining plastic ventilation pipes; (requiring flame retardant and antistatic mining quietness) can also be tested by the plastic film method ASTM4263 on the spot, with 450mm × 450mm plastic film flat on the concrete surface, sealed with tape paper After 16 hours around, there will be water droplets under the plastic film or the concrete surface will turn black, indicating that the concrete is too wet and should not be pasted. Air duct construction 1) Regarding relatively complex civil buildings, in the imagining stage, various types of work (heating and ventilation, water supply and drainage, power supply and lighting, and architectural specialty) should first negotiate the space separation, and determine the elevation field of each pipeline. In general, you should not go beyond the boundaries you set for yourself. Whenever there is a single pipe section to cross the boundary, the Xiaogan project should be negotiated. 2. Lay a layer of high-chromium cast iron plate on the easy-to-wear parts of the pipe. 2) The principle of dealing with the collision and harmony of various types of fabric ducts and ventilation ducts is generally: 'Small pipes let the big pipes, and there is pressure and no pressure'. For example, if the water pipe and the air pipe collide, the water pipe should be turned. If the cold and hot water pipes are removed from the water pipes, the cold and hot water pipes should be changed. The appearance of good air ducts is aluminum cloth, and aluminum cloth has a very strong anti-corrosion function. 3) Before construction, the engineer in charge of machinery and tools should draw the pipelines and single lines of various types of work on a drawing. Use one colored pen for each type of pipe. Summarize the elevations at each intersection to see if there are any contradictions, find them in time, and solve the problem before installation. 4) In order to reduce investment, save space, and reduce floor height, some pipes without slope requirements can be laid through beams (such as water pipes, fire sprinkler main pipes, etc.). Generally, the problem of noise should be considered in the planning stage, and the wind speed in the ventilation ducts of the workshop should be planned and controlled to avoid wind whistling. The following are some resumes. When passing the auxiliary consumer room, it must be close, in fact, no interface should be set. When the transport air temperature is higher than 80 ℃, the air duct should take protective measures according to the imagination. 5. The distance between the water curtain fan and the fan cannot be too close, cannot exceed 50 meters, and must be within 50 meters. The measuring hole of the air duct should be set at a position that is convenient for measurement and observation; the measuring hole on the air duct in the ceiling should be set aside for a movable ceiling panel or inspection door in the corresponding position. When the thermal insulation duct adopts metal flanges and metal reinforcements, measures to avoid cold bridge condensation must be taken on the exposed parts.

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