CEC Common Causes of Vibration in Centrifugal Fans
This is an in interesting article on CEC’s website. It covers the Common Causes of Vibration in Centrifugal Fans.
Ever since centrifugal fans have been manufactured they have been subject to vibration related problems. These problems range from simple unbalance conditions caused by mass variations on the fan rotor to much more complex issues related to shaft alignment, bearing fatigue, or resonance issues. In many cases excessive vibration levels in fans lead to unplanned, forced outages to perform maintenance.
Once to this stage, these outages are necessary to maintain safety. However, most often, they are costly both from a maintenance and lost production standpoint. Standards have been set as to what are acceptable vibration levels for corresponding operating speeds.
Other sources that outline acceptable balance and vibration levels for fans include ANSI/AMCA 204-96, Balance Quality and Vibration Levels for Fans; ISO 14694:2003, and Industrial Fans; Specifications for Balance Quality and Vibration Levels.
To read the brief discussions of the most common causes of vibration in centrifugal fans click the link below to be directed to the article.