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## Main Question or Discussion Point

Hi everyone,

Hoping someone can point me in the right direction.

I'm trying to find (a theoretical approximation of) the flow rate through a pipe where the pressure is provided by an axial flow impeller, but restricted by an orifice plate.

I have (or can get hold of) all the physical parameters - pipe dimensions, motor power, impeller power number, impeller pressure drop, pumping capacity, orifice area, etc..).

I know the flow rate through the open pipe with no orifice plate.

I imagine placing an orifice plate over the open pipe will create a higher pressure, more drag, put more load on the motor and reduce the flow rate.

How will I find out the new flow rate?

I guess I need to somehow find the new pressure difference either side of the orifice plate. I don't know how to do this.

Any ideas/suggestions/equations/text book references would be a great help!

Thanks!

Hoping someone can point me in the right direction.

I'm trying to find (a theoretical approximation of) the flow rate through a pipe where the pressure is provided by an axial flow impeller, but restricted by an orifice plate.

I have (or can get hold of) all the physical parameters - pipe dimensions, motor power, impeller power number, impeller pressure drop, pumping capacity, orifice area, etc..).

I know the flow rate through the open pipe with no orifice plate.

I imagine placing an orifice plate over the open pipe will create a higher pressure, more drag, put more load on the motor and reduce the flow rate.

How will I find out the new flow rate?

I guess I need to somehow find the new pressure difference either side of the orifice plate. I don't know how to do this.

Any ideas/suggestions/equations/text book references would be a great help!

Thanks!