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fburgos

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Reply with quote  #16 
i had a problem with a hoffman blower mounted on isolator pads, someone saw loose bolts on the base and tight them
HuskerTim

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Reply with quote  #17 
Quote:
Originally Posted by ssimmon1
I've been told it's a a Rexnord Wrapflex coupling.


One last thing of note....as mentioned the IB bearing housing is overfull with oil. We started this blower (located on the roof) at 3 am in 40°F ambient temperature. The blower discharge temperature climbed to 175°F within ~10 minutes, and continued to climb to a max of 220°F after about an hour.



I have FLIR recorded nearly identical temps on a 6 Stage 300HP Hoffman on an In-Shop test run of a unit.  Loaded about 70%. The first two images in the report are @ 10min and the second two are at 2 hours.  This particular unit is a Outboard Inlet/Inboard Outlet unit.
FLIR0116.jpg  FLIR0117.jpg  FLIR0120.jpg  FLIR0121.jpg 

RustyCas

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Reply with quote  #18 
Where is the discharge temperature monitored? I used to check the bearing temps, but a comparison of discharge-end bearing temp and the discharge temp (measured on the housing) would have been very useful, especially as a trended parameter. 220F seems really high. I’d think anything over 200F would be a red flag. Sounds to me like the extra heat is from the rub. I used to check the housing (barrel) temperature if I thought there was a rub, but I never really saw what I could say was “high” temperatures, but you’ve got a very large volume of air moving through there.
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ssimmon1

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Reply with quote  #19 
We've checked the obvious stuff, nothing's really changed since the outage.

Discharge temp is measured in the common outlet header for the #1 and #2 blowers.


Thinking it's time to pull the trigger on this one soon regardless....


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MarkL

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Reply with quote  #20 
Ouch 
Time to rip it I think.
Dave Reynolds

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Reply with quote  #21 
11/17 pk-pk time waveform g's was 9, peakvue waveform was 8, 11/18 pk-pk g's now 28, peakvue is 17, 11/28 pk-pk g's now 100 and peakvue is 54, 40 g's is critical alarm for peakvue, be lucky if it makes it 30 days.....suspect the modulating frequency is a bearing spinning on shaft or spinning in the bearing housing
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RustyCas

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Reply with quote  #22 
At 3600 rpm this is a ticking bomb.....
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