Do you know the precautions for stopping the screw air compressor?

DateTime：2025-09-25Source：U-air chainHits：

Proper shutdown of screw air compressors is often overlooked, yet it directly affects equipment lifespan, maintenance costs, and even operational safety—especially for industries like pharmaceuticals that depend on reliable compressed air systems. Mastering standard shutdown precautions can avoid hidden damage and ensure readiness for next use.

Routine shutdown: Follow the "step-by-step" principle

Never stop the compressor abruptly during normal operation. First, close the air outlet valve to cut off the air supply to the system. Let the unit run idly for 3-5 minutes to reduce the temperature of the compression chamber and lubricating oil—critical in summer or after long-term operation, as sudden shutdowns trap high heat inside, accelerating oil degradation. After idling, press the "stop" button on the control panel. For models with intelligent systems like AirSmart, use the one-key shutdown function, which automatically executes the idling process.

Emergency shutdown: Act fast but avoid secondary damage

Emergency shutdown is only for critical situations—such as sudden overheating (exhaust temperature exceeding 110℃), abnormal noise, or oil leakage. Press the red "emergency stop" button immediately, but note that this skips the idling step. After emergency shutdown, do not restart the unit immediately. Wait 30 minutes for it to cool down, then check the cause of the fault (e.g., cooling system blockage, lubricant shortage) and resolve it before restarting. For pharmaceutical facilities, document emergency shutdowns and repairs to comply with GMP requirements.

Post-shutdown maintenance: Don’t ignore "final checks"

After shutdown, cut off the main power supply to prevent accidental startup. Drain the condensed water from the air tank and pipelines—especially in humid environments, as residual water causes corrosion and microbial growth, which risks contaminating compressed air. Inspect the oil level and color through the sight glass; if the oil is turbid or low, plan for replacement. Clean the surface of the unit and check for loose fasteners or oil stains, addressing minor issues promptly to avoid bigger problems later.

For industrial enterprises, improper shutdown can lead to 15%-20% shorter equipment lifespan and increased maintenance costs. By adhering to these precautions, you not only protect the compressor but also ensure the stability of the compressed air system—laying a solid foundation for smooth production.

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