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jerardo martinez

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6 VANE IN FAN,   FRECUENCIY 3X?   LOSSNESS?
jerardo martinez

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Reply with quote  #2 
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Originally Posted by jerardo martinez
6 VANE IN FAN,   FRECUENCIY 3X?   LOSSNESS?

 
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Vibe-Rater

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Reply with quote  #3 
Hi and welcome Jerardo,

I don't understand the units used for the vertical  axis. Pulg/s ?  There is not much information here?

It must be driven by a motor, direct drive or pulley reduction?  Especially if pulley reduction it could be transmitted from motor.

I would triply check the running speed.  I normally also like to see better resolution.  Is this a Omnitrend?

Sorry for all the questions but it is so difficult to answer correctly with limited information. A photo of the machine would also be great. rgds
RustyCas

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Jerardo, if this is a direct-drive, overhung fan with roller bearings, then a dominant vibration at 3X is not unusual. I have no idea what causes this, even after monitoring some fans (with this characteristic) for 10 years or more. But it normally doesn't increase, so unless the overall vibration is unacceptable, I just trend it.
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HuskerTim

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Reply with quote  #5 
Inch is pulgada in Spanish, so I would guess In/sec?  Pulgada por Segunda... Pulg/s
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Reply with quote  #6 
That would make sense Rusty. And now that I read the topic more carefully. A cooling tower fan could also have a horizontal shaft leading from outside the enclosure to a right angle gearbox which might be 2 stage to get the horizontal fan speed down from motor speed. So a photo and more details.
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