Fan Common Problems

CENTRIFUGAL BLOWERS, ID BLOWER, FD BLOWER, DIRECT BELT DRIVE BLOWER, PP / FRP CENTRIFUGAL BLOWER, SPARE IMPELLER, FAN & BLOWER DESIGN, PREVENTIVE MAINTENANCE, SERVICE SUPPORT.

Common problems affecting the performance of Fans can be classified as follows

Causes of Vibration :-

Material deposition on the Impeller

Loose fixing of setscrews, bearings, bolts, or couplings.

Mis-alignment or excessive wear of belts coupling or bearings.

Bent shaft.

Excessive system pressure or restriction of airflow due to closed dampers

Inadequate structural support or mounting.

Externally transmitted vibration.

Non-Performance :-

Incorrect system design calculation or testing procedures.

Incorrect blower RPM.

Blower wheel rotating in wrong direction - check motor leads.

Improper wheel to inlet cone clearance.

Inlet or discharge air leaks, clogged filters, coils or damper settings.

System effect due to improper inlet or discharge connection as illustrated above.

Excessive Noise :-

Fan operating near “stall” due to incorrect system design or installation.

Vibration originating elsewhere in the system.

System resonance or pulsation.

Improper location or orientation of fan intake and discharge.

Inadequate or faulty design of supporting structures.

Nearby sound reflecting surfaces.

Loose accessories or components.

Loose drive belts.

Worn bearings.

Premature Component Failure :-

Abrasion or corrosion of internal fan components.

Vibration due to Impeller out of balance.

Lack of lubrication of bearings.

Misalignment or power transmission components or bearings.

Bearing failure from incorrect or contaminated lubricant or grounding through the bearings while arc welding.

Extreme ambient or airstream temperatures.