from the Automation List department...
Flow orifice calculations
Continuous process industries, DCS questions. topic
Posted by Sunil Kumar on 18 October, 2006 - 12:11 am

Suppose I have to install Orifice plate in a line for which I know the Line Size, Flow range, Pressure Range, Operating pressure & temperature range. As well as Viscosity. How can I calculate the Orifice detail? How can I calculate dp, beta ratio? Do you know some software where u feed the detail you know and it will calculate the beta ratio & dp? and orifice thickness? I mean free software. Please help me. I need it urgently.

Posted by Gabriel on 19 October, 2006 - 11:05 pm
Hello Sunil,

You might find your answer at
Start by looking at the Bernouilli equation. You must take into account whether your fluid is compressible or not!


Posted by Arun Kumar on 24 October, 2006 - 8:54 pm
It is better to go through BS-1042. In case if you encouner any problem, please do not hesitate to contact me.

Arun Kumar

Posted by Hilton Lawson on 28 October, 2006 - 1:56 am
Daniel flow has a downloadable flow orifice calculator that is menu driven and very to use. Daniel is a division of emerson electric.

Posted by John Catch on 21 October, 2006 - 1:40 am
A couple of sources for rigorous calculation procedures are:

R.W. Miller / Flow Measurement Engineering Handbook / McGraw-Hill
ASME standard MFC-3M-1985 or the latest version

There are many other less precise procedures also available

John Catch

Posted by muthuraman on 26 January, 2007 - 12:33 am
How much does this book cost?

Posted by denn on 27 January, 2007 - 12:54 am

A more precise assembly of calculations can be found in " L. K. Spink's "Principals and practice of flow meter engineering".

These are user friendly and directed at the plant floor.


Posted by Mickey on 21 October, 2006 - 9:21 pm

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