With temperatures plummeting, screw air compressors are prone to issues like difficulty starting, frozen pipe cracks, and lubrication failure. Winter equipment faults mainly stem from low temperatures affecting lubricating oil, condensate, and component materials. Focusing on the three core tasks—“prevent freezing, maintain lubrication, and start slowly”—can effectively reduce failure rates. This article breaks down winter management steps with practical, professional guidance to help equipment safely survive the cold season.
I. Pre-Startup: 5 Core Checks to Eliminate Cold-Start Risks
Comprehensive pre-startup inspections form the first line of defense against winter faults and must be executed sequentially:
- Environment & Temperature Check: Ensure the machine room temperature is ≥0℃. For outdoor units, build windproof shelters or wrap insulation, and install heating tapes on key parts (oil tanks, main units) to keep oil temperature ≥5℃. Verify air inlets are free of snow/ice blockages to avoid cold air damaging filters.
- Lubrication System Check: Switch to winter-specific low-viscosity oil (prioritize ISO VG32/46 grades with a pour point ≥10℃ below local minimum temperatures); never mix with summer oils. Confirm oil level is within normal range, oil quality is free of blackening or sediment, and replace oil filters after long shutdowns to prevent viscous oil from clogging lines.
- Condensate Drainage Check: Manually open drain valves on air receivers, dryers, and oil-water separators to fully empty residual condensate (until pressure reads 0.0bar). Ensure automatic drain valves are not frozen or stuck, and drainage pipes are unobstructed.
- Component Flexibility Check: Manually rotate the unit coupling 2-3 times; if resistance is high, reheat oil or investigate jamming. Inspect rubber parts (seals, oil seals) and immediately replace aged or brittle ones with low-temperature-resistant materials.
- Electrical Control System Check: Confirm stable power voltage, no condensation or rust on terminals, and no hardened/damaged wires to avoid low-temperature-induced poor contact or short circuits.
II. During Operation: 3 Key Monitors for Stable Performance
After startup, load gradually and monitor in real time:
- Preheating & Loading Protocol: Perform 3-4 jog tests (1-2 seconds each), then run unloaded for 5-10 minutes to warm up. Only gradually apply load once discharge temperature reaches ≥40℃ and oil temperature stabilizes; avoid cold hard starts that shock components.
- Real-Time Parameter Monitoring: Focus on discharge pressure, oil temperature, and oil level. Maintain discharge temperature between 40-80℃ (too low risks water separation; too high impairs lubrication). Immediately shut down for inspection if temperature or pressure anomalies occur.
- Dynamic Drainage: Check drainage every 2 hours; ensure automatic drains are clear, and shorten intervals for outdoor units to prevent condensate buildup and freezing.
III. Post-Shutdown: 4 Final Steps to Prevent Overnight Freezing Damage
Shutdown procedures directly impact overnight safety and require a standardized process:
- Unload & Cool Down: Run unloaded for 1-2 minutes to cool, then power off once temperature drops below 40℃ to avoid component cracking from thermal shock.
- Thorough Drainage: Reopen all drain valves to empty condensate from pipes, air receivers, and post-treatment equipment. Close water/air intake valves to eliminate residual water freezing risks.
- Insulation Check: Confirm pipeline insulation is intact, heating tapes function normally, and cover outdoor units with waterproof canvas to block wind and snow.
- Environment Maintenance: Keep the machine room ventilated and dry; turn on heaters if temperature falls below 2℃ to prevent moisture or freezing.
IV. Long-Term Shutdown: Special Protection Measures
For units idle over 1 week: Fully drain oil and condensate, close all valves, and seal air inlets to block moisture. Start the unit once weekly, run unloaded for 3 hours, and repeat drainage to maintain component activity. In extreme cold (-10℃ or below), add heating devices, disable automatic start functions, and use manual control.
The core of winter screw air compressor management is “prevention first, closed-loop process.” Following these steps avoids freezing cracks and wear, extends equipment life, and ensures stable production support. Adjust maintenance frequency based on unit models and local climate, and contact professional after-sales support for abnormal key components.