Explosion-proof FFU standard maintenance cycle (industry standard + lithium battery / chemical / pharmaceutical explosion-proof scenarios)
Based on explosion-proof regulations + cleanroom operation + annual explosion-proof electrical inspection requirements, the cycle is clearly defined in four major items and directly implemented.
1. Daily inspection (daily)
Check for abnormal sounds, vibrations, excessive heat, and odors
Check for any loosening or cracking of explosion-proof junction boxes, shells, and seals
Check the grounding of the machine body and the integrity of the equipotential connection lines
Applicable: All explosion-proof FFUs, mandatory
2. Routine maintenance (monthly)
Clean the FFU body and floating dust in the intake ports
Tighten explosion-proof screws, connection terminals, and explosion-proof sealing joints of cables
Check the pressure difference of the filter, and the uniformity of the air outlet
Check the temperature rise of the motor and whether the operating current is normal
3. Mid-term maintenance (every 3 to 6 months)
1. Filter replacement
General explosion-proof clean areas: about 6 months
Lithium battery / chemical / high solvent, high dust environment: about 3 months
Based on the pressure difference value: replace immediately if the resistance exceeds the standard (prioritize checking the pressure difference, not strictly adhering to the time limit)
2. Fan & motor inspection
Clean the accumulated dust and oil on the impeller
Check the operating condition of the bearings, and whether there is any jamming
Recheck the sealing of the explosion-proof surface and the aging condition of the rubber strips
4. Annual deep maintenance (every 12 months, mandatory)
Explosion-proof electrical special inspection (key)
Insulation resistance test, grounding resistance test, integrity check of the explosion-proof chamber
Overall condition inspection of explosion-proof motors, prohibit私自拆解 the explosion-proof structure
Replacement of aging parts of the entire machine： sealing rubber rings， aging cables， packing seal components
For multi-unit centralized control explosion-proof FFUs， inspect and repair the explosion-proof controller and wiring
5. Special environments shorten the cycle
Lithium battery， electrolyte， solvent evaporation environment： all cycles are halved
Dust， corrosive gases， high humidity environment： increase maintenance and inspection frequency
24-hour continuous non-stop operation workshop： check the bearings and electrical components every half year
6. Concise summary (convenient for writing plans / systems)
Daily inspection： 1 day
Routine tightening and cleaning： 1 month
Filter replacement： 3 to 6 months
Explosion-proof special annual inspection： 1 year
