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Participant

Join Date: Jul 2013
Posts: 3

Centrifugal Air Blower

08/28/2013 2:39 AM

Dear All

During the inspection of centrifugal air blower there is requirement of check the pressure and air flow.

i wanted to know that during suction and discharge open condition we can measure the flow. and during the close of suction we can measure the pressure. that is correct or not.

Kindly give some referance if any.

Thanks

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Guru
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#1

Re: centrifugal air blower

08/28/2013 2:44 AM

Most likely they want the pressure and flow to be measured under the same conditions, because that is what tells the fan performance.

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Participant

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#2
In reply to #1

Re: centrifugal air blower

08/28/2013 3:03 AM

Thanks for your reply

I under stand during suction and discharge in open condition both Pressure and flow parallel measure.

please give me some referance if any

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Guru
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#3
In reply to #2

Re: centrifugal air blower

08/28/2013 3:08 AM

Go back to the requirement for the test. There must have been some performance criterion at which the suitability of this particular fan for purchase was determined and documented. Obtain this criterion and a means of measurement before attending the test, otherwise that attendance would seem rather pointless.

Whatever the criterion was, it cannot be seen from here.

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Guru
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#4

Re: centrifugal air blower

08/28/2013 3:22 AM

One thing for sure, you wouldn't want to measure the pressure with the suction closed.

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Guru

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#5

Re: centrifugal air blower

08/28/2013 4:31 AM

Google: "blower performance curve".

It ain't rocket science.

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Guru

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#6

Re: centrifugal air blower

08/28/2013 5:29 AM

In order to have a correct information about the blower condition you MUST measure as well flow as pressure at different discharge openings. Suction should never be closed since then you have no fluid to build up pressure! Results should be compared (considering ambiance) with plant measurements at manufacturer place.

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Guru
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#7

Re: Centrifugal Air Blower

08/29/2013 12:01 AM

Dear Mr.heish.

It is Not Correct.

DHAYANANDHAN.S

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Power-User

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#8

Re: Centrifugal Air Blower

08/29/2013 2:42 AM

Is the machine running on VFD and you want to trace the performance of the blower at various pressures. In any case, pressure will be measured with suction and discharge valves open.

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Member

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#9

Re: Centrifugal Air Blower

08/29/2013 8:37 AM

http://www.greenheck.com/library/articles/10You most likely want to check the blower flow (velocity and volume) at a number of speeds (if variable speed) or operating conditions. These are usually controlled either by RPM or by a damper position. You'll measure with a pitot tube the static pressure, temperature and Delta P. You may also need to measure the ambient humidity and barometric pressure to plot the blowers' performance.

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