Installation of main air duct and return air branch pipe in clean workshop
Installation of main air duct and return air branch pipe in clean workshop
In the clean workshop project, the air duct is connected with flanges and has a good sealing effect. For the main air duct or long air duct, the air duct should be hoisted and placed on the hanger in place, and then bolted to the installed air duct. Duct connections, for shorter or lighter ducts, connect at ground level first...
Text label: Installation of main air duct in clean workshop, installation of branch duct for supply and return air
Installation of main air duct and supply and return air branch pipes in clean workshop
In the clean workshop project, the air duct is connected with flanges and has a good sealing effect. For the main air duct or long air duct, the air duct should be hoisted and placed on the hanger in place, and then bolted to the installed air duct. For air duct connection, for shorter or lighter air ducts, it should be connected to a certain length on the ground before being hoisted, and then connected with bolts after falling on the hanger; the thickness of the air duct flange sealing gasket of the purification air conditioning system For 5-8mm, the gasket should be pasted on the sealing surface of the flange before connecting the air duct, then punch the gasket against the bolt hole, and penetrate the bolt connection; the flange gasket should be elastic, airtight, For materials that do not produce dust, it is strictly forbidden to use latex sponge, foam plastic, thick cardboard and other materials with open pores and easy dust generation. High-quality rubber sheets and closed-cell sponge rubber sheet gaskets are often used in engineering. When affixing flange gaskets, it should be noted that the width of the gasket should be adapted to the sealing surface of the flange, so that the inner end face of the gasket should be flush with the inner surface of the air duct after the gasket is compressed, and should not protrude from the inner surface of the air duct, otherwise It is easy to increase the airflow resistance and easy to accumulate dust; the splicing of flange gaskets should be trapezoidal or tongue-and-groove.
The installation sequence of the air duct is usually to install the main air duct first, and the branch air duct should be installed in real time according to the decoration progress of the clean pharmaceutical cleanroom. Each valve, muffler and other components connected to the pipe should be equipped with bolt holes first, and then cleaned by a special person before they can be installed on the air duct, especially the micro-perforated plate muffler, which often has oil stains on the orifice plate and should be thoroughly cleaned. It can be installed after cleaning; for air ducts with high sealing requirements, sealant can be injected at the seam of the gasket when connecting, which can increase its sealing performance. A leak check should be performed. There are two types of installation of the branch air duct, one is to make an integral tee on the main air duct, and the other is to make a straight pipe section without making a tee on the main air duct. Make connections on field openings. In the first method, the branch air duct and the main air duct have good sealing performance and high strength, but the material consumption is large. The second method should not be advocated. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean workshops and purification projects.
The connection sequence depends on the connection method between the branch pipe and the main pipe. If the branch pipe tee has been installed during the production and installation of the main air duct, the connection sequence should start from the branch pipe tee, and at the same time, the position of the high-efficiency filter interface should be taken into account. The measurement and processing errors are naturally absorbed in this pipe section; if the branch pipe tee is not installed on the main air duct, it can be installed from the air inlet of the high-efficiency filter. Draw a line to open a hole and make a snap connection. This method will not cause production and installation errors, and save labor and materials, but the interface between the branch pipe and the main pipe must be handled well, so as to ensure the quality; the air inlet of the high-efficiency filter is installed. The regulating valve should be installed in front of the soft connection, so that when adjusting the air volume, the soft connection will not bear too much pressure shock, and it is also conducive to the installation of the air supply port of the high-efficiency filter. The connection sequence of the return air branch pipe is similar to the air supply branch pipe, and its spatial position is located between the upper surface of the ceiling and the lower surface of the air supply pipe. The air branch pipe should be connected to the return air tunnel at the top plate of the channel. The size of the return air hole opened on the top plate of the return air channel should be equal to the size of the return air branch pipe. The size of the return air channel is small; the regulating valve is installed on the ceiling plate, which can avoid the swing of the branch pipe when adjusting the return air volume, which can reduce the frequency of the soft connection being pulled, and the connection between the regulating valve and the color steel plate It can be riveted with blind rivets of 5*20mm, and flange gaskets that meet the requirements should be placed in between.
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