Catching the “P” on the P-F curve ｜ KPI design to detect bearing and misalignment issues on motors for pumps and blowers

In Chonburi and Rayong, rainy-season continuous operation of pumps, blowers, and cooling systems strains bearings and couplings on motors for pumps and blowers. The challenge is to capture the onset of P (Potential Failure) on the P-F curve with ISO 10816-aligned KPIs—without stopping machines.
■ Why now
Heavy rain, long duty cycles, and high load accelerate risk. With VSDs, RPM ranges widen and quiet early symptoms are missed by listening alone. A shared numeric language helps production, maintenance, and contractors decide consistently.
■ KPI technology explained
Center KPIs on RMS vibration velocity (mm/s RMS), combined with frequency and time-domain evidence:
- Unbalance: dominant 1×, grows with speed
- Misalignment: strong 2× and axial vibration
- Bearings: high-frequency content; envelope reveals BPFO/BPFI
- Looseness: broad spectrum with sub-harmonics
Use FFT for separation, envelope for confirmation. Implement two-level alarms with dwell, and set thresholds from baseline, not generic tables.
- MODEL-1332B for fast baselining
https://prime.nc-net.com/105994/en/product_others/detail_goods/25249
- MODEL-2502 for continuous 4–20 mA to PLC/SCADA
https://prime.nc-net.com/105994/en/product_others/detail_goods/25250
- MODEL-2590C for in-panel display and alarms
https://prime.nc-net.com/105994/en/product_others/detail_goods/25338
■ Applying in the field
Capture 30–60 minutes after startup as baseline, across VSD speed bands. Compare units to spot outliers. Confirm early changes with MODEL-1332B, then install MODEL-2502 for monitoring, and configure MODEL-2590C alarms. Plants detect issues earlier, reduce downtime, and shift to planned maintenance.
■ Showa Sokki’s recommendation
Don’t miss the “P.” Start with site baselines, set band-aware thresholds, and combine RMS, spectrum, and envelope KPIs. Begin with MODEL-1332B, expand with MODEL-2502, and add MODEL-2590C for panel alarms. Showa Sokki supports KPI designs aligned to ISO 10816 and real EEC conditions.
📩 For more details, please download the PDF or feel free to contact us.
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Download :
- MODEL-1332B (Free Download): https://prime.nc-net.com/105994/en/catalog/detail/7285
- MODEL-2502 (Free Download): https://prime.nc-net.com/105994/en/catalog/detail/7541
- MODEL-2590C (Free Download): https://prime.nc-net.com/105994/en/catalog/detail/7540
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■ Glossary
- RMS vibration velocity: Key health metric (mm/s RMS)
- Two-level alarm: Trend vs Action, with dwell
- Threshold: Derived from site baseline
- FFT: Fast Fourier Transform
- BPFO/BPFI: Bearing defect frequencies
- VSD (inverter): RPM control needing band-specific rules
- P-F curve: Time from detection P to failure F
- RMS / Peak / P-P: Common units
■ References
- ISO 10816 series overview for rotating machinery vibration assessment
- Application notes on ISO 10816/20816 in industrial condition monitoring
- Guides for interpreting vibration severity tables under ISO
- Sample explanatory materials on vibration zones and terminology
#PFcurve #ISO10816 #VibrationMonitoring #PredictiveMaintenance #ShowaSokki #PumpAndBlower #MachineHealth #EEC #ConditionMonitoring
(Last update : 2025-09-09)