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Pipe Flow and Pressure

2011-02-12

This may be an elementary question, but I am having the hardest time finding the answer.

I have a 2" pipe that is running water at 50 psi (city pressure) with a valve on the end.  Total length from the city main to the valve is about 100 ft. If I open this pipe up, fully open, to fill up a tank, what will the flow rate (gpm) be?

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>filter

 

HD2/HD1=(GPM2/GPM1)^2

HD1 is known: 50 psi
HD2 can be calculated by the pipe loss from the valve to the truck
GPM1 is calculated from HD1
and GPM2 is the fill rate of the tank

Job, you calculated the leaving flow rate from the valve.  Now you need to figure the rest of the way.

It's been awhile since I've had to figure a flow rate this way.  Usually I size the pump for full flow, and have to calculate the head to determine the pump size needed.


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