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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