Fan vibration

Hello 

My question is there any test to check a defective shock abosorber (spring unit) installed below an overhung fan to check is it properly working or not?

i have a centrifugal overhung fan with high vertical vibration at 1XTS and when i raise the fan frame with shaft at any shock absorber the vibration decrease at some points and another points increase.

i checked the alignment ,bearing clearances,the impeller 

and what the phase behaviour between horizontal and vertical at overhung fan bearings.

ready for any clarification.

Original Post

 

 

Hossham 2,

Quote: "i have a centrifugal overhung fan with high vertical vibration at 1XTS"

Have to compared the vertical amplitude and phase on the fan to the mounting plate in several different locations?

How does the axial amplitude compare to the fan bearings vertical, more or less or equal to,? If more or less, how much difference ?

Thanks and Have a Great Day,

Ralph

Ralph Stewart posted:

 

 

Hossham 2,

Quote: "i have a centrifugal overhung fan with high vertical vibration at 1XTS"

Have to compared the vertical amplitude and phase on the fan to the mounting plate in several different locations?

How does the axial amplitude compare to the fan bearings vertical, more or less or equal to,? If more or less, how much difference ?

Thanks and Have a Great Day,

Ralph

 horizontal 4 mm./sec 1xts

vertical 7mm./sec @1xts and 2xts

axial 3 mm. /sec 1xts

regards 

Hossam

 

Hossam 2 posted:
Ralph Stewart posted:

 

 

Hossham 2,

Quote: "i have a centrifugal overhung fan with high vertical vibration at 1XTS"

Have to compared the vertical amplitude and phase on the fan to the mounting plate in several different locations?

How does the axial amplitude compare to the fan bearings vertical, more or less or equal to,? If more or less, how much difference ?

Thanks and Have a Great Day,

Ralph

 horizontal 4 mm./sec 1xts

vertical 7mm./sec @1xts and 2xts

axial 3 mm. /sec 1xts

regards 

Hossam

 

What is the amplitude of the vertical direction on the base the fan is sitting on?

Ralph Stewart posted:
Hossam 2 posted:
Ralph Stewart posted:

 

 

Hossham 2,

Quote: "i have a centrifugal overhung fan with high vertical vibration at 1XTS"

Have to compared the vertical amplitude and phase on the fan to the mounting plate in several different locations?

How does the axial amplitude compare to the fan bearings vertical, more or less or equal to,? If more or less, how much difference ?

Thanks and Have a Great Day,

Ralph

 horizontal 4 mm./sec 1xts

vertical 7mm./sec @1xts and 2xts

axial 3 mm. /sec 1xts

regards 

Hossam

 

What is the amplitude of the vertical direction on the base the fan is sitting on?

at vibration dampers or shock abosrbers?

if so..some of them 6.5mm./sec and some of them 9 mm. /sec and one is giving 15 mm. sec at the frame end

thank you

Hossam

Are any of the above numbers in phase with the vertical on the bearings?

Seems like the bearing amplitude are close to only one sole plate number (7 vs 6.5). Is this 6.5 in line with the bearing, left/right

Quote:Sole plate numbers "6.5mm./sec and some of them 9 mm. /sec and one is giving 15 mm. sec at the frame end"

Fan bearing numbers:" vertical 7mm./sec @1xts and 2xts"

Ralph

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