Installation requirements for air ducts in clean workshops? - Frequently Asked Questions
Clean workshop air duct installation requirements?
The design and installation of the air duct is very important, which is related to the cleanliness, air volume, etc. of the clean pharmaceutical cleanroom after completion. Therefore, the installation process needs to be carried out in strict accordance with the process and technology, and the on-site construction management personnel need to manage in place. Now the person in charge of purification technology of Zhongjing Global will construct and install...
Text label: Clean workshop installation requirements, air duct installation
Clean workshop air duct installation requirements?
The design and installation of the air duct is very important, which is related to the cleanliness, air volume, etc. of the clean workshop after completion. Therefore, the installation process needs to be carried out in strict accordance with the process and technology, and the on-site construction management personnel need to manage in place. Now the person in charge of purification technology of Zhongjing Global has summarized the precautions in the construction and installation, so as to give you reference and reference.
Before the installation of the air duct in the clean workshop, it is necessary to verify whether the axis and elevation of the air duct and the return air outlet are in line with the design drawings, and check whether the reserved holes and the positions of the embedded parts meet the requirements; air ducts and accessories Removable joints shall not be installed in walls and floors; air ducts that convey condensed water or humid air containing steam shall be installed at the slope as required by the design, and the bottom of air ducts should not be provided with longitudinal contact. If there are joints, they should be sealed. ;For the air duct installed horizontally, you can adjust the level with the adjusting bolt of the hanger or by adjusting the pad on the bracket. After the air duct is installed in place, you can use the method of pulling wire, level and hanging wire to check whether the air duct is not Horizontal and vertical; for vertical installation of air ducts, the allowable deviation of verticality should not be greater than 2mm per meter, and the total deviation should not be greater than 20mm; for horizontal installation of air ducts, the allowable deviation of horizontality should not exceed 3mm per meter, and the total deviation should not be greater than 3mm. More than 20mm; the inner diameter of the steel casing should be based on the flange and insulation layer that can pass through the air duct, and its wall thickness should not be less than 2mm; the air duct should be equipped with a rain cover when it goes out of the roof, and the rain cover should be installed On the outside of the prefabricated well ring of the building structure, the rainwater can leak into the house along the wall surface, and the riser that penetrates more than 1.5m from the roof should be fixed with a cable, and the cable must not be fixed on the air duct flange. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean workshops and clean workshops.
Air duct protection: There should be a certain distance between the plastic air duct and the heat pipe or heating equipment to prevent the air duct from being deformed by heat, and the horizontal air duct should be 1%-1.5% when the gas that will produce condensed water is removed. Slope; hard polyvinyl chloride has a large linear expansion coefficient, and the bracket hoop cannot fix the air duct too tightly, and a certain gap should be left for expansion and contraction; the metal accessories, brackets, bolts and protective sleeves used on the air duct should be Paint anti-corrosion materials according to anti-corrosion requirements; 3-6mm thick acid-resistant rubber sheet or soft polyvinyl chloride plastic sheet should be used for the flange gasket of the air duct, and the bolts can be galvanized bolts or reinforced nylon bolts. Washers should be added to increase the contact surface and prevent the screw holes from being damaged by the tensile force of the bolts; the inner diameter of the steel casing should be based on the flange and insulation layer that can pass through the air duct, and its wall thickness should not be less than 2mm, the casing should be firmly embedded in the wall and floor; the plastic air duct should be protected by metal casing through the wall and floor, and a gap of 5-10mm should be left between the casing and air ducts or enough to pass through the air duct. Flange in degrees.
The air ducts installed horizontally can be leveled with the adjusting bolts on the hanger, and the air ducts with thermal insulation pads can be slightly adjusted by the thickness of the pads, but the pads cannot be cancelled due to adjustment; air duct connection The straightness of the air duct is checked with a wire rope, and the vertical air duct is checked by the method of hanging the wire; when the air duct is twisted, it should be adjusted by reassembling the flange. One side of the flange is filled with gaskets to adjust. When the air duct is light in weight, low in installation and inconvenient to hang pulleys or cannot be hoisted due to site constraints, the air duct can be pulled to the scaffolding section by section with ropes, and then lifted to the bracket to align the flanges and install them section by section.
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