The sealing of the air supply and return system pipeline is to prevent the unclean air from entering the air duct and prevent the polluted air from penetrating out of the air duct, so as to meet the cleanliness of the clean room and prolong the use time of the high efficiency filter. Pipeline processing, pipeline construction and installation quality of equipment should be mainly controlled in construction. The cleaning of air duct equipment and sealing measures in pipeline processing should be emphasized. High-quality galvanized steel sheets should be used in pipeline processing to meet the requirements of smoothness, smoothness, firmness and corrosion resistance. The noise-absorbing materials filled in mufflers should be dust-free, slag-free (fiber), moisture-absorbing and pollution-free, and should not use loose materials. Fiber materials should be felted materials, and the outer covering materials can prevent fibers from penetrating.
Foam plastics and centrifugal glass wool should not be used. Use neutral detergent to remove grease before air control operation, prevent scratches during production, and wipe the inner surface with white silk cloth at the end of production should be free of any grease stain and ashes to qualify for cleaning. After qualified cleaning and processing of the duct section, the ends of the duct are protected by plastic film and then transported to the site for installation. All duct fittings and equipment must be wiped clean before installation, otherwise they can not be installed. In the process of pipeline connection and equipment installation, attention should be paid to sealing measures to avoid secondary pollution. Because of the dust retention problem of hoses and soft joints, soft joints can be used in connection of cleaning pipelines and motor equipment, but they are not suitable for use in pipelines.
Secondly, controlling secondary microbial contamination is more meaningful than secondary contamination, and it is easier to be ignored. Secondary microbial contamination is contained in secondary dust pollution, mainly in air conditioning treatment equipment. Bacterial dust accumulated during operation of air-conditioning equipment provides favorable conditions for microbial reproduction in high temperature and humidity environment and nutrients provided by dust particles during shutdown period. New microbes and the harmful odorous gases they emit, as well as a large number of harmful metabolites, corpses and debris, a large part of which can not be blocked by efficient filters, thus constituting secondary microbial contamination.
The fact tells us that soft joint is also an important source of secondary microbial contamination. This is because soft joints are usually not insulated and condensation occurs here. For medical cleanrooms, even a small number of soft joints must be double-decked or insulation soft joints. All joints of combined air-conditioning units should be sealed. Water seals should be installed on condensate drain pipes of surface coolers to ensure air-conditioners are airtight.
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