How many gpm of water flow through a one inch pipe at 50 psi?

The question is a little more difficult to answer than you may think. Here is a link to the mathamatic concept, each pipe is different so you will need the material your using. google.com/k/d-gardiner/how-to-calculate-pressure-drop-and/35e6sqhxsbdsg/2#">http://knol.google.com/k/d-gardiner/how-to-calculate-pressure-drop-and/35e6sqhxsbdsg/2#

My friend Jeff from Canadian Leak Detection says: The answer is 189 gallons per minute. Then: The rest of the story is that 189 gallons is nozzle flow. If the water flows down the pipe for any distance the friction will slow the flow a bit.

So if you need really accurate flow rate I need more info.