Application of ventilation pipeline

Air ducts are mainly used in industrial and construction projects, and their application fields mainly involve: clean systems in clean workshops of electronics industry, clean systems in sterile workshops of medicines and foods, central air conditioning systems in hotels, shopping malls, hospitals, factories and office buildings, exhaust pipes for dust removal, smoke extraction and oil absorption in industrial pollution control, air supply pipes for comfortable industrial environment or jobs, gas drainage systems for gas drainage in coal mines, return air systems for environmental control in coal mines, etc. PS: It is often developed into a special escape and stealth route in movies and comics.

Material grade 1. Air duct for purifying air conditioning system: galvanized sheet and stainless steel; (It is forbidden to use glass fiber reinforced plastics and composite materials that may cause dust pollution)

2. Air duct of central air conditioning system: galvanized sheet and color steel insulation board; (FRP and composite materials can be used)

3. Air duct of environmental control system: galvanized sheet and stainless steel; (Plastic, FRP and composite materials can be used)

4. Air ducts for industrial ventilation systems: steel plates and galvanized plates; (Ladbrokes ventilation duct. Plastic, FRP and composite materials can be used)

Note: FRP air ducts are divided into organic and inorganic types. According to the design specification, the use of organic materials for fire prevention is prohibited.

5. Air ducts for special use occasions: mine coated air ducts and mine plastic ventilation air ducts; (Require fire-retardant and antistatic mine safety features) 1) For complex civil buildings, in the design stage, each type of work (HVAC, water supply and drainage, power supply lighting and construction) should first negotiate the space separation and determine the elevation range of each pipeline. In general, you should not go beyond the limits set for yourself. When individual pipe sections cross the boundary, they should consult with other projects.

2) The principle to solve the collision and coordination of various ventilation pipes is generally: "Let small pipes make large pipes, so that there is pressure but not pressure". For example, if a water pipe collides with an air duct, the water pipe should rotate. If the hot and cold water pipes collide with the sewer pipes, the hot and cold water pipes should be replaced.

3) Before the construction, the equipment manager engineer should draw the pipelines and single lines of each type of work on the floor plan. Use a colored pen for each pipeline. Synthesize the elevation of each intersection to see if there is any contradiction, find it in time, solve the problem and then install it.

4) In order to reduce investment, save space and reduce the floor height, some pipes without slope requirements can be laid through beams (such as water pipes and fire sprinkler pipes). ). Inorganic glass fiber reinforced plastic ventilation pipe (also called glass fiber magnesium oxychloride cement ventilation pipe) is a kind of pipe made of magnesium oxychloride cement as binder and alkaline glass fiber as reinforcing agent, filler and modifier. It has the characteristics of incombustible, Class A incombustible material, corrosion resistance, high strength and light weight. In the ventilation of building engineering, underground engineering and industrial workshop, the nonflammable organic glass fiber reinforced plastic ventilation pipe has been completely replaced, and the galvanized iron sheet ventilation pipe with poor anticorrosion performance is being gradually replaced. Especially in underground projects with high humidity and areas south of the Yangtze River, its advantages are more obvious.

Through the study of magnesium oxychloride cementing material and the inspection of products, it is found that there are still some quality problems in the production and engineering application of inorganic FRP ventilation pipes. Some quality problems have seriously affected the service life of the project and should be paid enough attention. According to the national building materials industry standard JC646-2006, ventilation ducts can be divided into three types: integral ordinary air duct, integral thermal insulation air duct and combined thermal insulation air duct, which are not suitable for oil fume exhaust ducts in residential buildings.

According to the physical and mechanical properties and appearance quality of ventilation pipes, ventilation pipes are divided into first-class products and qualified products. The size of magnesite ventilation pipeline is mainly designed by the design unit according to the ventilation required by the project, and can also be designed according to the specific requirements of customers.

The shape of magnesite ventilation duct can be divided into two types: circular and rectangular. The length of the pipeline is generally 2 ~ 3m. If the diameter of the circular tube and the length of the rectangular tube side are longer than 1.5m, the length of the tube section can be shortened appropriately. There are two ways to connect pipe sections: one is flange connection, and the other is socket connection. See table 1 for specifications and dimensions of Class P pipeline.

Table 1 P class pipeline specification size/Mm allowable deviation of circular pipe diameter or rectangular pipe length; allowable deviation of circular pipe diameter or rectangular pipe length; flange size, width and thickness ≤ 300 3+0.510 3 ≥ 30 ≥ 5 320 ~ 500 4 0.5 ≥ 40 ≥ 6 530 ~1000 5.5. 4 ≥ 50 ≥ 81060 ~150060.5 ≥ 55 ≥101600 ~190070.5 ≥ 60 ≥15 ≥ 20. See Table 2 for the specifications and dimensions of Class D pipelines.

Table 1 size /mm Class D pipeline name basic size allowable deviation length 2700 ~ 3000- 14 width 250 ~ 450 3 height 150 ~ 300 2 wall thickness 9 +2

-1 thermal insulation duct is mostly used in heating and cooling air conditioning projects, and its wall thickness is thermal insulation plus structural thickness. The insulation layer is polystyrene foam board or polyurethane foam plastic board. Its thickness is 20 ~ 30mm.

Ventilation fittings such as reducing pipe, tee pipe and bend pipe should be designed and manufactured according to the corresponding ventilation pipes.