Air duct inspection and insulation in clean workshop
Air duct inspection and insulation in clean workshop
In the construction process of the clean workshop, no matter what method is used to check the air leakage, the general purpose is to control the air leakage within a reasonable range, and easy-to-implement and effective inspection and testing measures should be formulated. The process is dynamically controlled; in the control of the air duct...
Text label: Air duct inspection in clean workshop, air duct insulation in purification pharmaceutical cleanroom
Air duct inspection and insulation in clean workshop
In the construction process of the clean workshop, no matter what method is used to check the air leakage, the general purpose is to control the air leakage within a reasonable range, and easy-to-implement and effective inspection and testing measures should be formulated. The process is dynamically controlled; in the production and installation process of the air duct, the focus should be on the form of the bite, the method of engagement, the sequence of operations, flange processing, gasket paste, installation skills and other aspects. It is forbidden to use bites that are easy to leak air Form; for the parts that are prone to air leakage, such as the four corners of the flange connection of the straight pipe section, the connection between the tee branch pipe and the main pipe, the variable diameter pipe section, etc. should be the focus of verification; the acceptance method should be changed, and the light leakage method acceptance should be changed to air duct Quality control in the whole process of processing.
After the air duct is inspected, it needs to be cleaned before insulation. Check whether the galvanized steel plate is scratched during the installation process, and whether the galvanized layer is peeled off. After drying, heat preservation can be carried out according to the design and selected heat preservation materials and heat preservation methods; the heat preservation materials used in the clean workshop should be non-combustible or flame retardant materials, and the heat insulation of air ducts and pipes located in the clean workshop should not be used. Materials that are easy to generate dust, such as glass fiber and short fiber mineral wool; rubber-plastic insulation boards and composite silicate insulation boards are used more; The water vapor partial pressure difference generated by the temperature difference causes the water vapor in the air outside the pipe to penetrate into the thermal insulation material with the heat flow under the action of this partial pressure difference, and condensate water occurs in the thermal insulation structure, resulting in the thermal insulation material. Therefore, it is necessary to set a moisture-proof layer outside the insulation layer. When the temperature of the conveyed air is higher than the ambient temperature, the insulation structure generally does not have a moisture-proof layer, and the insulation material adopts closed-cell structure. , which helps prevent water vapor penetration. Zhongjing Global can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean workshops and purification plants.
For the adhesive type insulation board, the key to construction is accurate material cutting and tight joints. The flange joints should be spliced u200bu200btightly, and insulation strips should be pasted on the outside to prevent the formation of cold bridges at the flanges. Except for the flanges, other joints should be sealed with tape to prevent moisture. The width of the adhesive tape should not be less than 50mm; the thickness of the insulation strip at the flange should not be less than 0.8 times the insulation layer of the air duct. For the moisture-proof layer of the cold pipe, the construction It should be close to the thermal insulation layer, and should not be stuck, wrinkled, or bubbling. The moisture-proof layer of the riser should be laid from bottom to top, the seam of the circumferential lap should be toward the lower end, and the seam of the longitudinal lap should be located on the side of the pipeline. The seam is downward; for the pipeline passing through the clean workshop, a metal protective shell should be installed outside the insulation layer, preferably a stainless steel sheet, and the bite should be tight and flat to prevent dust and bacteria from accumulating. When the composite silicate insulation board is constructed, first apply the matching paste material directly on the insulation board, with a thickness of 2-5mm, and paste the paste-coated board directly on the pipe, and use the same method to paste layer by layer. , until the thickness of the insulation layer required by the design is reached, the surface can be plastered with a paste material, and after the surface is dry, the special treatment can be carried out.
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