The filters in the clean workshop should not be replaced merely based on a fixed time period. The pressure difference is the core indicator for determining whether to replace the filters. At the same time, a comprehensive assessment should be made considering the on-site environment and the duration of operation. The filter has two key parameters: the initial pressure difference and the final resistance. The pressure value recorded after the new filter is installed and operates stably is the initial pressure difference; when the pressure difference rises to the final resistance value specified by the manufacturer, it is necessary to arrange for replacement.

For pre-filter M-level bag filters, the final resistance is generally twice the initial resistance; for F-level medium-efficiency filters, the final resistance is generally 1.5 to 2 times the initial resistance; for H-level high-efficiency filters, when the final resistance is reached, or if the filter material is found to be damaged or leaking, it must be replaced immediately. If the dust concentration in the workshop is high, the pressure difference of the filter will increase significantly, shortening the replacement cycle; if the pre-filter fails at the front end, the dust will directly enter the rear filter, causing rapid blockage of the rear filter. In addition to the pressure difference, regular PAO leak detection should be conducted. Once a leak is detected in the filter, regardless of how long it has been used, it must be replaced immediately.

Equipment features: It is recommended to establish a filter pressure difference ledger, record the pressure difference data daily or weekly, draw a pressure difference change curve, predict the replacement time, and prepare in advance to avoid filter failure affecting the production in the workshop. The filter replacement cycle does not have a fixed fixed time. The core is based on the pressure difference. Reasonable monitoring of the pressure difference and timely replacement of the pre-filter can effectively extend the service life of the end high-efficiency filter and reduce the long-term operation cost of the clean workshop.