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.=20
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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