I want to learn how to do sizing of orifice. Please tell me the steps to be followed, or refer me to a site to get material.
I want to do it manually.
I have software, but I want to learn to do it by hand.

 

I suggest you review the ASME website for specification MFC-3M-1985 (or the latest version). It is entitled "Measurement of Fluid Flow in Pipes Using Orifice, Nozzle, and Venturi". This document will give you the accepted equations. However, "ASME Fluid Meters Handbook" or the ISA.org website can also be helpful, especially for the determination of gas expansion factor. There are also a number of "shortcut" methods that are published. However, they all come back to the ASME spec. and generally are not as accurate.

Sincerely,
John Catch
http://www.inflowinc.com

 

There is a very basic book on this,"Flow Measurement Engineering Handbook" by R. W. Miller. You may refer the same. Also for short guidelines you may refer a standard, BS1042.

If you refer Miller you will have to study hard about the properties of fluids.

This is from Shrikant S. Manas Microsystems Pvt. Ltd. http://www.manasmicro.com

 

There are 3 well knwn standards for orifice:

1. ISO 5167 - Part 2
2. AGA Report No. 3
3. ASME MFC 3M

I believe if you refer to one of these standard, you can start your hand calculation. A complete process information (viscosity, density, etc.) will help too.

Regards,

 

Or download an orifice sizing package such as FESizer (use Google to find them) and check that way.

 

Pl. see book - <i>Applied Instrumentation in the Process Industry - Vol III</i> by Andrew Williams. Refer to last chapter <i>Typical calculations</i> which includes calculation for orifice plates, control valves,relief valves etc. etc.

http://www.amazon.com/Applied-Instr...=sr_1_1?ie=UTF8&s=books&qid=1252846492&sr=1-1

 

Check this out....

http://www.lmnoeng.com/Flow/OrificeGas.htm

else the best way is to refer to ASME, R W Miller's Flow Measurement, David Spitzer's Book in Flow Measurement etc. There are various references to get this information.

Hope this help.