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# gpm thru 2\" pipe at 50 psi

this table is similar to what Mike was referring to. Dave

• Member Posts: 1
gpm thru 2\" pipe at 50 psi

Wondering what the gpm's are on a open ended 2" pipe at 50 psi? No friction loss or head. Just looking for a rough measurement.
• Member Posts: 6,928

Don't have it with me now, but there's a table in the little black book named Pocket Reference that allows you to estimate GPM from an open pipe by measuring the horizontal distance it takes for the stream to drop x inches.

EXCEPTIONAL little book.
• Member Posts: 1,790
bernoulli and others

It's a free jet, pretty close to this (some rounding to get the 4):

GPM=4*(the square of the diameter in inches)*(square root of the gauge pressure in psi)

so GPM = 4 * 2^2 * sqrt(50) = 113GPM
• Member Posts: 6,928

Yep. That's exactly what I was thinking of.
• Member Posts: 1
how did you get the 4

I was wondering how you got the 4?
• Member Posts: 643
Lenght?

It does not work like that! Use the B&G System Syzer. Example: 45 GPM in a 2 inch iron pipe, within normal design parameters can pass 48 GPM with a loss of 4.5ft (aprox 10 PSI) per 100 ft of pipe. I looked up a pressure loss table. At 50 PSI ( pressure loss) per 100 FT, it is a flow of 116 GPM which is entirely unrealistic. It surpases the maximum recommended velocity of 10 FPS! The lenght of the pipe is the most important factor, if you are working either with a pump or city pressure on an open system.
• Member Posts: 459
gpm

look up  water flow through hose - Engineering Tool Box   there is a curve.
RJ
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