Preventive Maintenance for Screw Compressors

Optimal PM frequency for screw compressors balances the cost of maintenance against the cost and probability of failure. OEM recommendations provide the starting point, then failure history data and condition monitoring results are used to adjust intervals. Over-maintaining equipment wastes resources, while under-maintaining it increases failure risk.

Preventive maintenance for screw compressors performs tasks on a fixed time or usage schedule regardless of current condition, while predictive maintenance uses condition data to determine when maintenance is actually needed. The most effective programs combine both approaches, using PM for tasks like lubrication and filter changes while applying PdM technologies to defer or trigger major component overhauls based on actual condition.

The Rotary Screw Compressors failure population is dominated by rotor bearing wear, oil separator degradation, control faults. Each leaves a different signature: rising airend temperature, oil carryover, cfm loss. Preventive Maintenance captures these via task completion against schedule and trends them over the time- or hours-based per task schedule. Early-stage indicators appear before functional failure — the lead time runs wear-curve-based for items with known PF intervals on most modes.

Three triggers. First: rising trend on any key measurement (vibration amplitude up 30 percent over six months, wear metals climbing, IR megger declining). Second: a recent repair on the asset — post-repair baseline needs reconfirmation. Third: a process upset that may have exposed the equipment to conditions outside design (overload, contamination, thermal event). Any of the three justifies a 60-90 day check instead of waiting for the next scheduled time- or hours-based per task round.