Clean room purification air conditioning system verification management
Clean room purification air conditioning system verification management
The purification and air conditioning system of biological clean room is filtered and sterilized by filter. The cleanliness requirements are different, and the selection and level of the filter are also different. High-efficiency three-stage filtration; for the filter, the main...
Text label: clean room purification air conditioning system, system verification management, clean workshop system
Clean room purification air conditioning system verification management
The purification and air conditioning system of biological clean room is filtered and sterilized by filter. The cleanliness requirements are different, and the selection and level of the filter are also different. High-efficiency three-stage filtration; for the filter, it is mainly to manage the cleaning of the filter and the cycle of filter replacement; during the operation of the purification air conditioning system, the filters at all levels have different efficiencies and resistances. In the air cleaning technology, The initial resistance of the filter is related to the air volume. The air volume passing through is different, and the initial resistance value is also different. This can be seen on the filter characteristic curve; the initial resistance can be divided into three types: rated initial resistance, design initial resistance and actual initial resistance. When the system is running, the measured initial resistance of the filter can be obtained through the pressure measuring instrument or through the measured air volume charter curve; with the operation of the purification air conditioning system, the dust accumulated on the filter material gradually increases , the resistance of the filter will also gradually increase, resulting in the continuous increase of the system resistance and the gradual reduction of the air supply volume, which requires adjustment to keep the air volume unchanged; when the resistance of the high-efficiency filter exceeds twice its initial resistance, The air supply volume will be reduced, and as a result, the number of air changes in the clean room will be reduced, which may reduce the cleanliness of the indoor air. At this time, it is necessary to carry out inspection and verification to determine whether it is necessary to replace the high-efficiency filter.
In the purification air-conditioning system, most of the primary and medium-efficiency filters are installed in the combined air-conditioning unit, which can be verified by checking the indication value of the differential pressure gauge and the appearance of the primary and medium-efficiency filters; Whether the differential pressure gauge of the medium-efficiency filter is sensitive, and whether the reading of the differential pressure gauge exceeds the final resistance of the filter, if it exceeds the final resistance, it must be cleaned; Replace the primary or medium-efficiency filter. If there is no damage, no air leakage, and the verification is qualified, it can continue to be used; the primary-efficiency filter layer set at the return air outlet of the clean clean room modular can be verified by checking its appearance and the pressure difference of the clean room. Whether the status is qualified; if the pressure difference in the clean room is qualified and the primary filter layer is not damaged, it can continue to be used. If it is damaged, the primary filter cloth must be replaced; Do not continue to use, must be cleaned immediately. The filters at all levels used in the air supply and exhaust system of the biosafety laboratory should be disposable products and cannot be cleaned and reused. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and clean workshops.
The replacement of the filter should be carried out after the system stops running; the replaced filter material should be packaged and disposed of as waste, and should not be discarded casually; the frame and surrounding surfaces should be thoroughly cleaned when the filter is replaced; the filter installation frame should be tightly sealed , can not produce air leakage; when replacing the filter, the filter material should be prevented from being damaged, and the tightening force of the bolts of the pressing frame should be uniform. Verification after filter cleaning and replacement: the reading of the differential pressure gauge is close to the initial resistance of the filter, which is qualified; the reading of the differential pressure gauge is too small, and the filter may be damaged and leaking, and its appearance should be checked and replaced in time. High-efficiency filter verification: clean room cleanliness testing, if the cleanliness meets the requirements, microbial testing is required; if the settled bacteria meet the requirements, the high-efficiency filter can continue to be used; clean room air volume testing, the residual pressure in the air handling unit meets the system In the case of requirements, if the air volume of the clean clean room modular decreases, it means that the dust holding capacity of the high-efficiency filter increases and must be replaced; if the air volume of the clean room meets the requirements, the clean room should be thoroughly cleaned, disinfected and sterilized, and then the cleanliness, Detection of sedimentation bacteria. The verification of the purification air-conditioning system requires the determination of a large number of relevant parameters, and the measured data is compared and judged with the design data. First of all, it is necessary to verify whether the testing instruments and meters are accurate. All instruments and meters must be calibrated, otherwise The test data is not authoritative, and the verification results are not reliable.
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