Page 259 - Root Cause Failure Analysis
P. 259
Fans. Blowers, and Fluidizers 247
Table 20-1 Common Failure Modes of Cenhifugal Fans
'HE PROBLEA
p
P
c
P
i
c
THE CAUSES - I
Fan Delivering Mm Than Rated Capacity I
Fan Wheel or Driver ImbaQnced
Packhg Too Tight or Defe Stuffing Box I
I@
Poor Fan Inlet or Outlet Condykns
Total Svstem Head Greater Than Ddan 1 .
[STrLI or Density Above Des@
SpeedToo HI h
Too Much Grease in Ball Bearings
Total System Head Less Than Design e
Unstable Foundation
Vibrah Transmitted to Fan fmm Outslde Souroes
wheal Binding on Fan Housing
Wheel Mounted Badward on Shaft e
Wan Bearings
Worn Coupling
1 XLCyde Magnetic Hum
Source: Integrated Systems, Inc.