Compressor A Analysis

Date
Dec 13, 2025
Executive Summary
High Vibration

Due to unexpectedly high vibration levels in Compressor A, a comprehensive vibration analysis was conducted. The overall RMS vibration exceeded the alarm limit of 7.1 mm/s (ISO 10816-3). Analysis identifies shaft imbalance and system resonance as primary contributors.

Critical Finding
Resonance detected at 1015 RPM with peak vibration of 26.69 mm/s.
2-Year Vibration History
Dec 2023 - Dec 2025
Trend shows stable operation until mid-2025, with rapid escalation in the last 6 months.
Vibration Trend (Run-up / Coast-down)
Key Measurements
  • RMS Velocity (Overall) 8.2 mm/s
  • Peak (1X) Axial MDE 6.61 mm/s
  • Peak (1X) Horiz PDE 4.88 mm/s
  • Resonant Peak (1015 RPM) 26.69 mm/s
Contributing Factors
Shaft Imbalance System Resonance Structural Weakness
Recommendations
1. Operational Adjustments

Avoid operating at speeds that excite resonant frequencies (approx. 70% and 90% of rated speed). Lock out 1015 RPM range in VFD.

2. Structural Reinforcement

Reinforce motor base frame with stiffeners to shift natural frequencies away from operating range.

3. Field Balancing

Perform motor solo run test. If imbalance confirmed, perform field balancing of the rotor.