deepakjoyin

Here are few sites that can answer your question.

http://www.1728.com/flowrate.htm
http://www.pipeflowcalculations.com
http://www.engineeringtoolbox.com/pi...stems-t_6.html

Hope it helps.

Regards,
Zoran

I think that you must be a length of pipe. if you want to know that flow passes through an outlet or orifice plate length but need not exit diameter and in that case I recommend the soft instrucalc. to an outlet of a tank using ecuciones departing from the equation of Theorem bbernoulli and then corrected by several factors.
hpe it helps