Pressure transducer location

[ptonsparky]

I know I've read how far from a 90 of other type of fitting a transducer should be located buy I don't remember were.
So many inches after, or before based, on the size of the pipe. Less turbulence.

AI, didn't help, but I probably didn't phrase the question correctly.

 

[don_resqcapt19]

That information if typically found in the transducer instructions.

 

[Joethemechanic]

Yeah you really want to get it in an area of laminar flow (or the closest thing to laminar), But how far that is from an elbow depends on lots of things. pipe material, fluid velocity, what kind of fluid, etc..

Is the pressure reading critical?

 

[synchro]

This is what I got from an online search:

"For accurate and stable measurements, a pressure transducer should be installed at least 10 pipe diameters downstream and 5 pipe diameters upstream from an elbow or any other source of turbulence."

You should also keep some distance away from any change in the diameters of the pipes, because that affects the velocity and therefore how much of the total pressure is dynamic pressure, and how much is static pressure (what a pressure transducer from a tap is measuring).

How important these considerations are depends on the flow rate. Below a certain flow rate, turbulence and dynamic pressure will become negligible for most applications.

 

[ptonsparky]

That information if typically found in the transducer instructions.

I looked at the one I use and didn't find it.

 

[ptonsparky]

This is what I got from an online search:

"For accurate and stable measurements, a pressure transducer should be installed at least 10 pipe diameters downstream and 5 pipe diameters upstream from an elbow or any other source of turbulence."

You should also keep some distance away from any change in the diameters of the pipes, because that affects the velocity and therefore how much of the total pressure is dynamic pressure, and how much is static pressure (what a pressure transducer from a tap is measuring).

How important these considerations are depends on the flow rate. Below a certain flow rate, turbulence and dynamic pressure will become negligible for most applications.

That's what I was after.