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Ahmed525

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Posts: 19
Reply with quote  #1 
We have high vibration in some fan we call it In Cement plant(I'd fan), the problem I have faced that vibration is increasing Suddenly. Some time upto 6mm/s and some time upto 12 mm/s.
The limit is 4to 6mm/s
Spectrum in normal condition is 1.5 mm/s
And thter is two peak which is 1x and 4x. And small peaks 2x,3x,6x,5x,7x,8x,9x, 10x.
The speed is 900RPM

DO YOU THINK WHAT COULD BE A PROBLEM?
Noknroll

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Reply with quote  #2 
Tell us more about the fan. 
Is it direct drive? Belt drive?
fixed speed? Variable speed?
Fixed or variable dampers?
Where and at what orientation is the high vibration measured.
Does the fan have cement build up on impeller?
What is normal condition when 1.5 mm/sec is measured
fburgos

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Posts: 670
Reply with quote  #3 
Harmonics up to 10x sign of mechanical looseness, varying overall also a sign of looseness, measure phase if not stay then problem is looseness

buildup or wear can cause unbalance and combined with looseness machine dets crazier.


I know this because I had a very good client at a cement plant, until they build the fan with abrasion resistant material and clean constantly we recommended that, also they bought from us a portable analyzer.

It's seems to me you are describing that machine.
Ahmed525

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Reply with quote  #4 
1-Fan fixed between two bearing,
2-The speed fixed at 900RPM,
3- when it running, dampers will be open 100%.
4-The fan cleaned from last shutdown...
5-The normal condition is 1.5 mm/s
Ahmed525

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Reply with quote  #5 
From your experiences,
Can you tell me at what angle and points (drive /motor/fan/non-drive/H/V/A) you can compare? Because I have taken the reading but still I'm not analyzing it...
MarkL

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Reply with quote  #6 
If you are not analyzing it....who is? I hate having to look at data I didnt collect myself. 

bryanpetersen@gcc

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Reply with quote  #7 
I suspect the bearings supporting the fan are journal bearings?
Ahmed525

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Posts: 19
Reply with quote  #8 
Motor side
DE
H=110
V=149
A=110
NDE
H=110
V=124
A=153
FAN
DE
H=118
V=28
A=120
NDE
H=118
V=178
A=137


IM NOT SEE ANY ANGLE MATCH
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