Centrifugal Air Blower

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

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

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.

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

Google: "blower performance curve".

It ain't rocket science.

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.

Dear Mr.heish.

It is Not Correct.

DHAYANANDHAN.S

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.

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.