How to Find Flow Rate of a Pipe Having Diameter and Pressure Only

You can not. You need a lot of more parameters- pipe characteristics, pressure drop over a length. The geometry over the length....

Then use Darcy Weisbach Equation.

Or better still put a flowmeter.

banu..

There are three numbers that add up to 50.

One of them is 7.

Tell me the other two....

do you have a performance curve of the pump that operates that pipe?

if you have, read the curve.

that curve have plotted flow rate (gpm or m3/hr) ,on axis and head (ft h20 or mh20 or bar).

the pressure that you have known must be converted to "head" and by check the curve you can find the pressure drop.

Although this is the way to find the entirely pressure drop of the pipingline,

You can estimate if you only want to known how much pressure drop on the pipe.

thanks

how about a reverse?? how can i determine what pumps should i use if given data are pipe length, flow rate & friction loss?? please help me with this one

You should find the total head of your system. And give safety factor 110% of that head.

Every pump have different performance curve. from this curve, find the point of Best Efficiency of the pump. You can see that the pump will operate efficiently at how much head and how much flowrate.

You must assure that the pump that you select has higher efficiency at that head and that flowrate.