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To what extent does the pressure difference of the air shower hepa filter need to be replaced?
To what extent does the pressure difference of the air shower hepa filter need to be replaced?The pressure difference replacement standard of air shower high-efficiency filter is usually determined according to its final resistance, and the specific range needs to be combined with the initial resistance, the use environment, and the equipment requirements:1. Universal replacement standard Final resistance threshold The final resistance of the high-efficiency filter is generally set to 2-3 times the initial resistance (usually 300-400Pa). If the device is equipped with a differential pressure gauge, replace it immediately when the resistance reaches this threshold. Some high-precision scenarios (such as the pharmaceutical and electronics industries) may require final resistance ≤450Pa. Estimation without differential pressure gauge If the differential pressure meter is not installed, it can be estimated according to the running time: when the initial effect filter is normal, the resistance of the high-efficiency filter increases by about 50-100Pa every 1000 hours of operation. When the resistance is close to 300Pa, it should be replaced. Second, special scene adjustment High pollution environment (such as industrial dust areas): the final resistance can be advanced to 250-300Pa. High temperature and high humidity environment: Because the filter paper is easy to delix, the resistance may increase suddenly, and the detection cycle needs to be shortened. Biosafety laboratory: In case of microbial contamination (such as mold spots), even if the resistance is not up to standard, it needs to be replaced. 3. Operational suggestions Differential pressure meter monitoring: preferentially refer to the differential pressure meter of the equipment, and replace it according to the final resistance value marked by the manufacturer. Wind speed auxiliary verification: If the wind speed is lower than the standard value (such as < 25m/s) and the initial effect has been cleaned, it is necessary to check whether the pressure difference exceeds the standard. Regular maintenance records: Set up filter files, record the resistance value during each replacement, and form trend analysis. Iv. Reference basis The industry standard "Clean Rooms and Associated Controlled Environments" (GB/T 25915) recommends that the final resistance be 2-3 times the initial resistance. Some enterprises set the final resistance to 300-450Pa according to actual experience, and the specific equipment manual shall prevail. Through the above method, the replacement time of the high-efficiency filter can be accurately judged to ensure the clean performance and operating efficiency of the air shower room. |
