How should a plant establish a rotating equipment baseline after major repair?
A repair baseline should preserve operating context and repeatable measurements so the next inspection can distinguish normal variation from an emerging defect.
Define the measurement plan before startup
Choose equipment points and directions, vibration quantity and units, speed, process flow, suction and discharge pressure, bearing temperatures, lubrication conditions and relevant motor electrical readings. Record the sensor type and collection method.
Confirm commissioning prerequisites
Complete required alignment, coupling, lubrication, guarding, rotation checks, instrumentation and functional tests through site procedures. Do not collect a baseline as a substitute for return to service acceptance. Apply isolation and machinery guarding rules during testing.
Collect at stable representative conditions
Document actual speed, load, operating mode and process conditions for each reading. For variable speed machines, establish separate reference conditions or a speed dependent evaluation method. Compare with manufacturer limits and previous data before declaring the repair successful.
Industrial example
A pump receives new bearings and a coupling alignment. The team records vibration spectra and bearing temperatures at two repeatable operating points after stabilization. Three months later, a rising bearing frequency component is compared against the correct speed matched baseline.
Make the baseline reusable
Store raw waveforms or spectra where available, measurement locations, units, operating conditions, instrument details and date. Link them to the asset and work order, and schedule an early followup after the repair.
Implementation checklist
- Define consistent measurement points and units
- Complete return to service checks
- Record stable operating context
- Link baseline to asset and followup inspection
Explore KANE consulting
Discuss practical maintenance and reliability improvements for your facility.
Request a consultation →Related answers: Related guidance · Additional guidance