Root Cause Analysis for Centrifugal Fans

Specialized Root Cause Analysis programs for Centrifugal Fan Reliability & Maintenance.

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47% Reduction in unplanned downtime

85% Faults detected before failure

3-6mo Average fault lead time

5:1 Typical program ROI

Why it matters

Key Benefits

Repeat Failure Elimination

Structured root cause analysis of centrifugal fans failures identifies the physical, human, and systemic causes behind failures of the impeller (wheel), housing, shaft, bearings, and inlet damper or variable inlet vanes. Addressing root causes eliminates repeat failures rather than simply replacing broken parts.

Corrective Action Effectiveness

RCA for centrifugal fans produces specific, measurable corrective actions with assigned owners and completion dates. Tracking corrective action implementation ensures that investigation findings translate into actual reliability improvements.

Organizational Learning

Documenting RCA findings for centrifugal fans failures creates a knowledge base that prevents similar failures across the fleet. Sharing lessons learned across sites and equipment types multiplies the value of each investigation.

Context

Challenge & Approach

The Reliability Challenge

Impeller blade cracking attributed to fatigue may be initiated by erosion thinning that changes blade natural frequency into a resonance condition. Bearing failures attributed to normal wear may result from chronic imbalance from material buildup that was tolerated because vibration levels were below alarm thresholds. Shaft fractures at keyways or step changes are stress concentration failures that may be preventable through design modification. Housing erosion or corrosion that leads to structural failure may develop at locations not included in routine inspection programs.

Our Approach

We preserve failed impellers, bearings, shaft sections, and housing pieces for examination. Impeller fracture surfaces are analyzed for fatigue initiation points—erosion thin spots, weld defects, or stress concentrations. Blade thickness measurements document erosion distribution. Bearing surfaces are examined for failure mode—fatigue spalling, lubrication failure, contamination damage, or overload. Vibration data history is reviewed for trending patterns and alarm responses leading up to the failure. Operating records are checked for excursions beyond design flow rate, temperature, or speed. We verify that the fan is operating within its design envelope and that no system changes have shifted the operating point. The RCA report documents physical evidence, root cause determination, and corrective actions including design modifications where warranted.

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Root Cause Analysis for Centrifugal Fans

Key Benefits

Repeat Failure Elimination

Corrective Action Effectiveness

Organizational Learning

Challenge & Approach

The Reliability Challenge

Our Approach

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