Looseness or? Bill Kilbey

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Presentation transcript:

Looseness or? Bill Kilbey WWTF Blower Looseness or? Bill Kilbey

Overall vibration increasing motor

Overall increasing on blower

Motor

High resolution on motor

2x TS/2x LF

1x TS Modulation of RBPF

Blower

Hi res blower inbd vert Note the sideband modulation. Caused by load or driver?

Bearing defects on blower? Very close to BPFO for 6314 bearing.

Modulation of 4.5 Hz (.225 sec. approx.)

Peak List PEAK FREQUENCY PEAK ORDER NO. (CPM) VALUE VALUE ---- --------- ----- ----- 1 3573.8 .1813 1.000 2 7147.8 .0959 2.000 3 10720.7 .0362 3.000 4 10991.3 .1891 3.076 5 14294.6 .0364 4.000 6 14567.7 .0312 4.076 7 17869.1 .0375 5.000 8 21441.3 .2145 6.000 9 21712.1 .1878 6.076 10 21981.8 .0364 6.151 The red highlight peaks are sidebands. Diff. of .076 orders (271.5 CPM/4.5 Hz) Not discrete non-synch bearing freqs.

Review of observations Blower has audible beat Looseness in motor and blower High 1x TS from imbalance/misalignment Modulation on blower and motor Is it load/process related or driver (motor) related?

Motor closer look… Audible beat and sidebands may be related to rotor problems. Slip is .44 Hz, sidebands on motor at .88 = # of poles * slip = .44 * 2 MCSA will be performed next week.

Sidebands at pole pass

Log Scale