How often should an air compressor that has not been used for a long time be maintained?

For air compressors that are not used for a long time, the maintenance cycle must be combined with the equipment parking environment, shutdown period and equipment type. The core purpose is to prevent corrosion of internal components, deterioration of oil, aging of seals and dampness of electrical components. The following are specific maintenance suggestions and operating points:

1. Maintenance cycle recommendations

1. Short-term discontinuation (1-3 months)
   • maintenance cycle: each 1 month start-up operation 30 minutes, and check the basic status.
   • operation points：
     • Check the oil level and coolant level before starting to ensure that they are within the normal range;
     • Observe for abnormal noise, vibration or oil leakage after operation;
     • Clean the dust on the surface of the equipment and check whether the electrical connection is loose.
2. Mid-term discontinuation (3-6 months)
   • maintenance cycle: each 2 months start-up operation 1 hour, and supplement basic maintenance.
   • operation points：
     • Change the lubricating oil (if the parking environment is humid or contains corrosive gases);
     • Check the air filter element and replace it if it is blocked or damp;
     • Check the tension of the drive belt (if it is a belt drive) and adjust if necessary.
3. Long-term discontinuation (more than 6 months)
   • maintenance cycle: each 3 months start-up operation 2 hours, and perform comprehensive maintenance.
   • operation points：
     • Thoroughly replace the lubricating oil and oil filter to prevent oxidation and deterioration of the oil;
     • Clean the cooler to remove internal dust and dirt;
     • Check all seals (such as shaft seals, cylinder gaskets) and replace them if they age;
     • Conduct insulation tests on the electrical system to ensure there is no risk of moisture or short circuits.

2. Key maintenance items and operations

1. Lubrication system maintenance
   • Oil replacement: After long-term use, the lubricating oil is prone to oxidation and deterioration, forming colloid or precipitate, which needs to be completely replaced. For example, oil-injected screw air compressors need to replace special screw compressor oil and clean the oil circuit system.
   • oil level check: Check the oil level before each start to ensure that it is within the range of the oil mark scale to avoid equipment damage caused by lack of oil.
2. Cooling system cleaning
   • Cooler cleaning: Use compressed air to purge dust on the surface of the cooler, or wash it with clean water (ensure that the equipment is powered off and the waterproof level meets the standard). If the interior of the cooler is blocked, it needs to be disassembled and cleaned or used professional cleaning agent.
   • Coolant check: If a water-cooled air compressor is used, check the coolant level and concentration to prevent freezing or corrosion.
3. Air intake system maintenance
   • Air filter element replacement: After long-term shutdown, the filter element may be damp or blocked, and a new filter element needs to be replaced to ensure clean air intake.
   • Intake valve inspection: Check whether the intake valve is flexible and there is no jam or air leakage.
4. Electrical system testing
   • insulation test: Use a megohmmeter to test the insulation resistance of electrical components such as motors and control cabinets to ensure that it is ≥1MΩ (the standard value may vary depending on the equipment model).
   • wiring check: Check all wiring terminals for looseness or oxidation, tighten or replace if necessary.
5. Seal inspection and replacement
   • Shaft seals, cylinder gaskets, etc.: Long-term shutdown may cause aging and deformation of seals. Leakage or damaged seals need to be inspected and replaced.
   • O-ring inspection: Check all O-rings for cracking or deformation, and replace them if necessary.

3. Suggestions for optimizing the parking environment

1. dry and ventilated: Park the air compressor in a dry, well-ventilated room to avoid erosion by moisture or corrosive gases.
2. Dust-proof covering: Cover the equipment with a dust cover to reduce the entry of dust.
3. periodically activating: Even if it is not used for a long time, it is necessary to start the operation regularly according to the above cycles to keep the parts lubricated and prevent corrosion.
4. anti-rodent measures: Place a rat guard plate or rat repellent around the equipment to prevent rats from biting wires or pipes.

4. Handling special circumstances

1. Not maintained before shutdown: If the equipment is not maintained before being deactivated, comprehensive maintenance, including replacing oil, filter elements, seals, etc., needs to be carried out before being reactivated.
2. Poor parking environment: If you park in an environment with high temperature, high humidity or corrosive gases, shorten the maintenance cycle (such as performing comprehensive maintenance every 1 month).
3. equipment aging: For equipment with a long service life, it is necessary to increase the frequency of maintenance and focus on inspecting vulnerable parts (such as bearings, belts, etc.).