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Brought it down from 35m/s2 to 4m/s2. The vibes picked to +-13m/s2 three days ago. There was a leak (flue gases) blowing onto the DE bearing housing, but that was rectified (carbon seal replaced) and the vibes have since remained at +-10m/s2.

yes I have balanced it on the 16 Nov, on the DE. The vibrations on the Bentley was reading 4 m/s2 rms. They are now reading 10 m/s2 rms. I had brought it down from 35m/s2 rms.

Greg, If you look at the NDE axial and Horizontal, the is a peak at or about 300 Hz. The DE horizontal does show a 2nd order with harmonics. What I dont understand is why the 6th harmonic is significantly big on the NDE axial & Horiz. Also what is indicated by the 2nd order with its harmonics on...

The coupling is non-lubricated TurboFlex HBS-540 with 8 bolts. Yes the vibration is at 298.9 Hz, close to 6 times the rpm. I will have to take newer readings with phase angle. I dont understand when you say "fan running pinched back at low flow"?

The Fan has 9 blades. There are six duct supports on the discharge side and four duct supports on the Inlet side. On the discharge side however, there is an extra small mechanical (screw-like) support rod, type that looks like adjusting rods for accelerator linkages on old heavy trucks. No one...

I have a problem with a dominant velocity peak at 6 times the rpm. What symptom does this indicate. This peak is on the NDE of a 400 kW Booster fan. The fan uses journal bearings. The DE of the fan shows 2 times rpm vibration but on the motor DE there is no indication of 2 times which would...

I hope we are on the same page, time history as in trend right? Attached is the trend. Remember I mentioned that we stopped one compactor for replacing seals but found that the DE bearing had collapsed. Now I was just wondering if the other compactor could be going thru the...

Thanks GregLocock. Yes the crest factor=peak/RMS. We have two production streams and the other Compactor is showing similar values of crest factor (please see attached for comparison), with all other parameters below alarm limits though. So, really what does the Crest Factor tell someone? Thanks...

Hello everyone. I have a problem with analysing vibration data with regard to "Crest Factor". All other measurements (Overall vibration, velocity and acceleration) seem to be well below the alarm limits. BUT when looking at the Crest Factor, its above the limits. These measurements were taken...

Does anyone know what the Shock Pulse Method is and if it is a proven Predictive Maintenance technique? Also, does it only apply to roller bearings?

Guys I am thrilled to report that I have done the 4-Run method on a big Fan (Flue Gas), and it worked!! The Fan initially tripped and my Boss called me and asked if I was confident I would do it before knock-off time, I said YES. It took me about 2hrs and the Fan vibration levels dropped to...

I understand TPL. My confidence is not coming out of reading the help I have got from you all only, though it was very insightful. I have a Balancing Jig at my disposal and throughout this week I have been working on it and learning balancing issues (mostly single plane). I have learnt a lot. I...

TPL Thanks mate, and yes I am still on that January balancing issue. I have decided to do it myself and learn on my own through help from guys like you. Thank you so much, I am now confident to go to the Section Engineer and let him know that I will attend to the problem. As for other issues...

No, this is not for School..I want to balance a Flue-Gas Fan that keep coming out of Balance. I just want to know whether finding the correction mass has the same relation as when you use Mils for the vibration parameter. Thanks. I am a Graduate Engineer (Mechanical)

Can anybody help me with the procedure of carrying out a 4-Run Balancing Method using Mils/sec as the vibration parameter. I am only familiar with using Mils instead. Also, please give me the equations for calculating the correction mass

Thanks guys. You guys are the real experts. Working in Africa is a nightmare.!!! I will take every point suggested and look deeper. The vibration problem seems to have come about at the same time the bag filters failed, at least thats what the Technicians are telling me. I am new in the...

Thanks to everyone's responce, especially "rmw", the boiler FLUE-GASES go through the bag filters before being extracted through the stack. Some of the flue-gases are sucked by two Booster fans and channeled to a kind of scrubber where soft water and a bit of soda-ash are added to let CO2 escape...

Can anybody help.? I am experiencing a repetitive imbalance problem on a two stage Booster Fan. We call experts to come in and they perform balancing (on the Impeller) and the following week the problem comes back again. I have been suspecting the Flue-gas. Currently the Bag-Filters are worn out...