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.
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