Can the screw air compressor close the dryer to work normally?

Running state and matters needing attention of screw air compressor after closing dryer

1. equipment function analysis
screw air compressors and dryers perform different functions in compressed air systems:

• screw air compressor: The core function is to compress the ambient air to the pressure range of 0.6-1.3MPa, providing power source for pneumatic tools, control systems, etc. Its work does not depend on the dryer and can be operated independently.
• Dryer: Reduce the dew point temperature of compressed air to -20 ℃- 70℃ remove moisture and oil to ensure air cleanliness in accordance with ISO 8573-1.

Operation effect after 2. closing the dryer

1. short-term operational feasibility
   • the screw air compressor can still operate normally after the dryer is turned off, but the water content of the output compressed air will increase significantly. In dry season or low humidity environment (relative humidity < 40%), short-term shutdown of the dryer (≤ 2 hours) has limited impact on most pneumatic equipment.
   • Note: When the ambient temperature is> 30 ℃ or the humidity is> 60%, the dew point temperature of the compressed air may rise above 10 ℃, resulting in the accumulation of condensate in the pipeline.
2. Long-term operational risk
   • pneumatic component failure: After moisture is mixed into the gas path system, solenoid valves, cylinders and other components are prone to failure due to corrosion or jamming. According to statistics, in systems not equipped with dryers, the failure rate of pneumatic components has increased by 40% -60%.
   • Product Quality Risk: In scenarios that require high cleanliness of compressed air, such as spraying and food packaging, moisture may cause blistering of the coating and contamination of the product.
   • system corrosion accelerationcondensate water and oil in the compressed air are mixed to form an acidic emulsion, which accelerates the corrosion rate of the inner wall of the pipeline by 3-5 times.

3. applicable scenarios and restrictions

1. scenarios that allow the dryer to be turned off
   • temporary gas use: such as equipment commissioning, short-term use of pneumatic tools (<1 hour).
   • Standby System Test: During the maintenance of the dryer, it can be shut down briefly to verify the system redundancy.
   • Dry Environment Applications: such as desert area or air conditioning plant (relative humidity < 30%).
2. Prohibit the scene of closing the dryer
   • precision Manufacturing: CNC machine tools, robots and other equipment require extremely high cleanliness of compressed air (dew point ≤ -20℃).
   • Low temperature environment: When the ambient temperature is less than 5 ℃, the moisture in the compressed air is easy to freeze and block the gas path.
   • Medical/Food Industrycomply with GMP or HACCP standards, and the compressed air must reach Class 1 cleanliness.

4. operation suggestion and risk control

1. short-term shutdown operation specification
   • confirm the ambient temperature and humidity before closing (temperature < 30℃, humidity < 60%).
   • The closing time shall be controlled within 2 hours, and the drain outlet of the air storage tank shall be checked every 30 minutes to see if any condensate is discharged.
   • After re-enabling the dryer, it will be connected to the main air circuit after 30 minutes of operation to avoid moisture impact on the system.
2. Long-term closure alternatives
   • installation of bypass pipe: during the maintenance of the dryer, the air will be supplied directly through the bypass pipe, but an automatic drain valve shall be added at the end of the pipe.
   • Configuration of standby dryer: the key system is recommended to use dual hot backup, automatic switching when a single failure, to ensure continuous dry gas supply.

5. Conclusion
the screw air compressor can operate normally after the dryer is turned off, but the use scenario and duration must be strictly limited. Enterprises should develop operating specifications based on process requirements, environmental conditions and equipment tolerance, and verify system reliability through regular testing of compressed air quality (water content, oil content, particulate matter). When the dryer must be shut down, risk control measures should be taken, such as shortening the operating time and strengthening drainage monitoring, to avoid equipment failure or product quality problems caused by air quality degradation.