Daily Maintenance Procedures for Centrifugal Air Compressor

Centrifugal air compressors are high-speed rotating precision equipment. Their core components such as impellers, bearings and seals are highly sensitive to operating conditions. Compared with screw air compressors, they feature high efficiency and fewer wearing parts, yet impose stricter requirements on standardized maintenance. Most failures do not occur suddenly; instead, they result from accumulated issues caused by inadequate routine inspections and failure to address abnormal parameters in a timely manner. Following the timeline of “routine maintenance — periodic maintenance” for centrifugal air compressors, Turbo-Tech Compressors has sorted out a set of practical routine maintenance procedures ready for direct implementation.
Routine Maintenance Procedures for Centrifugal Air Compressors: Operation Guide from Periodic Checks to Overhaul
I. Basic Principles of Routine Maintenance
Three principles shall be clarified before proceeding to specific steps:
1. Check data before operation. Most failures of centrifugal air compressors leave traces on instruments in advance. Pressure, temperature, vibration and shaft displacement are key indicators to judge the health status of the unit.
2. Documentation prevails over memory. Record readings in every inspection. Hidden troubles can only be identified by generating trend curves.
3. Tiered implementation. Routine maintenance consists of three levels: per-shift inspection, weekly/monthly inspection, quarterly and annual maintenance.
II. Overhaul (Carried out in accordance with the cycle specified by the manufacturer)
Overhaul is restorative maintenance that requires unit disassembly to restore the designed clearances of rotors, bearings and seals. It is mostly applied to units with continuously excessive vibration, severe medium corrosion and long operating hours.
1. Rotor disassembly and inspection: Disassemble and clean the impeller, and perform rotor dynamic balance test; inspect impeller blades for cracks and corrosion, repair or replace them when necessary; check the main shaft journal for wear and scoring.
2. Bearing disassembly and inspection: Fully disassemble radial bearings and thrust bearings; check the babbitt metal for peeling and scratches, measure bearing clearances, and replace bearing shells if clearances exceed the limit.
3. Gearbox overhaul: Disassemble the gear pair, inspect gear surfaces, replace worn bearings and oil seals, clean the housing and replace all lubricating oil.
4. Complete seal replacement: Replace dry gas seals, labyrinth seals and shaft end seals according to standards, and readjust seal clearances.
5. Flow passage component maintenance: Remove fouling from diffusers, return channels and volutes, and repair erosion damage.
6. Calibration and replacement of all instruments and valves: Evaluate and replace aging transmitters, solenoid valves and actuators; disassemble and repair anti-surge valves.
7. Foundation and secondary grouting inspection: Check whether the unit base and foundation have cracks, and retighten anchor bolts.
8. Perform dynamic balancing, alignment and commissioning of the whole unit after overhaul, issue an overhaul report and establish a brand-new equipment health file.
III. Quick Reference for Common Abnormalities
1. High discharge / oil temperature
Common Causes: Clogged cooler, insufficient oil volume, high ambient temperature
Handling: Clean the cooler, replenish oil, improve ventilation
2. Excessive vibration
Common Causes: Fouled rotor, misalignment, bearing wear, loose anchor bolts
Handling: Tighten bolts, recheck alignment, arrange dynamic balance and bearing inspection
3. Low oil pressure
Common Causes: Oil pump failure, clogged filter element, oil circuit leakage
Handling: Inspect oil pump, replace filter element, fasten pipelines
4. Pressure ratio fluctuation, suspected surge
Common Causes: Insufficient intake, clogged interstage cooler, faulty anti-surge valve, damaged seals
Handling: Inspect filter elements and coolers, test anti-surge valve, verify seal condition
5. Frequent shutdowns
Common Causes: False sensor alarm, abnormal control logic
Handling: Calibrate sensors, check program settings
The above is the introduction to *Routine Maintenance Procedures for Centrifugal Air Compressors: Operation Guide from Periodic Checks to Overhaul*. It is recommended to establish a fault handling ledger for each unit, recording the phenomenon, data, handling measures and verification results of each abnormality. Over time, this will form a valuable equipment file. If you encounter any problems with your centrifugal air compressor, please feel free to contact the Turbo-Tech Service Department. We are ready to provide you with professional support.