HI All--

Danny Rye likes to promote the old mechanic's trick--place a long rod 
(e.g. screwdriver) on the object of interest, and your ear on the other 
end.  It does help localize sources of sounds if you can catch it 
during  a rattle....

The fans on our UPS's whine at a frequency of a turbo pump that's 
working too hard--very annoying.

take care,


On 1/6/2017 8:16 AM, Kevin Dillon wrote:
> Neil,
> I would think the turbo would run hot if the fan completely failed 
> which will surely shorten its life. You know how much a turbo 
> costs. Our fan started whining last year-  we were also unsure if it 
> was the turbo or the fan but once we pulled the fan it was obvious 
> its bearings were on their way out. You could pull the side and blow 
> air over the area with another fan until you get a replacement. We 
> found the brand name and part# from the fan and ordered a few extras 
> from an electronics vendor.
> Good Luck.
> Kevin
> ------------------------------------------------------------------------
> *From:* Stable Isotope Geochemistry <[log in to unmask]> on 
> behalf of NEIL OGLE <[log in to unmask]>
> *Sent:* Friday, January 6, 2017 6:28:04 AM
> *To:* [log in to unmask]
> *Subject:* [ISOGEOCHEM] Failing fan?
> All:
> Just wondering if anyone has had the fan inside a Delta V (top of the 
> chimney, beside the turbo) fail.  I cant make up my mind if its the 
> fan or turbo beginning to make periodic rattling noises.  If you've 
> worked in a lab as long as I have you become attuned to background 
> noise and are susceptible to these types of little changes!  As the 
> machine was in hiatus over Christmas with needle valve closed, thought 
> I'd take the opportunity to change the oil in the backing pump and run 
> a hoover over the area.  Im leaning towards the fan as pre-shutdown 
> vacuum was in the mid -8s  and as I've turned everything back on 
> again, the vacuum is coming down as expected.  Ive also done the 
> screwdriver to the ear trick and the pump noise is constant while the 
> chimney seems to confirm my suspicions.  Anyway just seeking any other 
> observations and if it was to fail, say over the weekend, how damaging 
> could this be
> Neil
> Stable Isotope Facility
> School of Natural and Built Enviornment
> Queen's University Belfast
> Northern Ireland