Multiple hole orifice plate
Multiple hole orifice plate
(OP)
Sorry, I'm really new to multiple hole orifice plates.
When designing a multiple hole orifice plate, how do you determine the diameter of the holes to the spacing of the holes? Is there a standard I can read?
Thank you for any help.
When designing a multiple hole orifice plate, how do you determine the diameter of the holes to the spacing of the holes? Is there a standard I can read?
Thank you for any help.





RE: Multiple hole orifice plate
The ones we use in gas measurement (to condition the flow upstream of the meter plate) have a very low dP and a very high percentage of dP that is recovered downstream. Those plates were developed to provide a nearly swirl-free stream to an orifice plate--everybody's plate from Dr. Laws to Mr. Galagheger, to the guys in Canada that knocked off everyone else and have dominated the market was developed through experimentation and there was never a closed-form equation to describe why and how they worked.
David
RE: Multiple hole orifice plate
RE: Multiple hole orifice plate
David
RE: Multiple hole orifice plate
RE: Multiple hole orifice plate
David
RE: Multiple hole orifice plate
If you calculate you need a 5 inch orifice in a 12" line, then 5 1" holes will give the same differential pressure.
In any case, it takes some experimenting unless you want to pay the big money for an accoustical study.
Another system used is to build a bottle that has a diameter of 6 to 10 times the diameter of the pipe it is on. Its lenght would be 3 to 5 times the diameter. There would be a solid circular plate the diveds the vessel in half. The line would go into the vessel that is alined horizontally, at the center of the head. The line would exit the chamber and jump over to the other side. The gas would exit the other side through a line in the center of the head. In the line that connects the two chambers, an set of flanges to hold the orifice plate would be installed.
I'm not the designer of them, but what little I know of accustics is that this system is effectively a low pass filter with a capcitor, and resistor and another capcitor.
RE: Multiple hole orifice plate