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Thread: Air flow and pressure help needed
www.piclist.com/techref/index.htm?key=air+flow+pressure
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face BY : John Pearson email (remove spam text)



Hello,

I am in need of some help with my project.

A am measuring static air pressure. I need to know the static pressure in a 4" pipe that has been reduced to 2". The air in the 4" pipe is too turulent to measure accurately because of the transition to 2". So I would like to measure the static pressure in the 2" pipe where the flow is much more stable. However, I have found that the static pressure in the 2" pipe decreases quite rapidly compared to the pressure in the 4" pipe as velocity increases. Is there an equation that will let me measure the static pressure in the 2" pipe and let me convert it to the equivalent pressure in the 4" pipe if I know the velocity in the 2" pipe?

Help would be appreciated.

Thanks
John

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