How to install the plastic ventilation pipe correctly

How to install the plastic ventilation pipe correctly? Plastic ventilation pipes are used in many industries, but if you want to install them yourself, you must learn the correct installation process for a long time. To avoid unnecessary mistakes.
Air duct assembly: the short air duct can be assembled on the ground at one time, and the long air duct can be assembled in sections according to the situation of the installation site. During assembly, the center degree and levelness of air duct shall be adjusted as much as possible to avoid air duct distortion or up and down wave, left and right swing dragon, each section of air duct shall not exceed 10m. During assembly, the gasket shall be leveled, the flange bolt shall be tightened evenly, and the nut cap shall face the same direction.
Air duct in place: first check the water level, elevation and firmness of all supports. In general, two methods are used to place the air duct: direct and spreader. If the cross-section of the air duct is small and low, the manual positioning method can be used, only the simple scaffold can be erected. When the cross-section of the air duct is large and the pipe section is long, the pulley, chain block, rope and other methods can be used for hoisting. In order to facilitate the positioning of air duct, the method of hanging the air duct on the scaffold and then lifting it on the air duct support is generally adopted. The scaffold shall be erected along the length direction of its air duct, and the height and position shall be suitable for construction operation. The hoisting sequence shall be from main pipe to support and riser.
The air duct shall be straightened, the air duct placed on the bracket shall be straightened, the horizontal and flat position of the air duct shall be adjusted, and then fixed according to the requirements of the atlas