this time i got i visaul spectra for the ppl how asked for to know is it failure or just over load i said before this is an air blower in cement plant a high vibration readings in velocity measurements and high impacts on the waveforms, can anyone help ?!

Air.Blower.A12.DOC (94 Kb, 69 downloads) the Spectra

Ahmed,

The high spikes in axial waveform spaced 1xSS indicates that the bearing is very bad. The spetra also indicate possible faults on both inner and outer rings/races, so you better fix it soon!

Walt

Ahmed,

If this is a root blower, it should have timing gears and it looks like either/or, gear/lobe mesh is also an issue; perhaps due to bearing defects.
The blower will require an internal inspection at the soonest, although I've seen much higher vibration levels on Blowers in the past.

Cheers...Rajan Muthukrishnan

Although spikes in the TWF are of concern the spectrum does not look like the one with a bearing defect. Similar pattern is present on both IB and OB bearings. So, there might be some other common cause affecting vibration on both bearings, may be flow related. More info in the blower and process is needed.

David

This message has been edited. Last edited by: David_G,

Maybe I can't see it, but it looks like the fault frequency lines for outer race and roller frequencies matched pretty well in the spectra. The waveform is pretty ragged like multiple faults and/or possibly failing bearing geometry will do.

If this was all I knew, I'd be alarmed enough to check it out further. I would collect some PeakVue data also. One at Fmax 60,000 cpm/1600 or 3200 lor, 1000 hz hp filter and one at 120000 cpm/3200 or 6400 lor, 2000 hz hp filter. I would only do that because it doesn't take a lot of time and I would figure that I might not have too much of that.

Knowing specifically what kind of blower it is would help because like Rajan said, Roots blowers and others of that type can run very high amplitudes for a long time.

look danny I will collect some PeakVue data also. One at Fmax 60,000 cpm/1600 or 3200 lor, 1000 hz hp filter and one at 120000 cpm/3200 or 6400 lor, 2000 hz hp filter. to tell me what u think ?? ok

Don't forget the time waveforms, too.

[quote]Ahmed.mustafa Posted May 24, 2007 2:27 PM
hello everybody
im a new member here im a vibration analyst, i want to ask about something related to the air blower vibration, dose anyone have the vibration severity standard for it and also when i get a captured data for the blower axis i see a high vibration RMS a high impacts and the look of damaged bearing on the spectrum
but its not, its a new bearing how this comes if anyone have an idea reply me, and i will thankful
Posts: 1 | Location: egypt | Registered: 24 May 2007


Hi Ahmed,

I see in your first question about this "air blower" you said it has "new Bearing". Has the amplitudes changed since May 24, 2007?

Like some of the guys have asked, what type "blower" is this? I admit it looks like a bearing defect but would be nice to know it something is involved other than bearings only.
IF you would like, you could extract the data out into a small database and email it to some of us so we could have a closer look.

ralph_stewart@alertanalytical.com

Depending on brand, type of blower, number of lobes, these machines misbehave in many ways. Worn gears enable lobes to contact, bearings eat up the seating or the shaft so lobes contact frame and abnormal bearing wear. Do you also have a history of cracks in the mounting, piping? More info on the machine specifics is needed. Olov