General rule for finding cfm delivery in pipe

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PmDavis300
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OK, if someone could please help.

I need a GENERAL rule for finding cfm in pipe

120psi at source

1/2in copper pipe

10ft drop

100ft of pipe

can someone give me a VERY simple equation on how to figure out the cfm capability of this pipe? I don't need a complex long equation, i just need an answer that will give me a rough estimate of cfm, within 10 or 20% of the actual cfm delivery of this system. THANKS AGAIN!
 
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Welcome to PF.

There isn't enough information provided. The critical factor is the pressure drop through the pipe and to get that, you need to know the pressure at the outlet (or the desired pressure drop). And usually, CFM is an input, not an output (what is the application?). Then you plug that into a table like this: http://www.engineeringtoolbox.com/compressed-air-pipe-pressure-d_36.html
 
russ_watters said:
Welcome to PF.

There isn't enough information provided. The critical factor is the pressure drop through the pipe and to get that, you need to know the pressure at the outlet (or the desired pressure drop). And usually, CFM is an input, not an output (what is the application?). Then you plug that into a table like this: http://www.engineeringtoolbox.com/compressed-air-pipe-pressure-d_36.html

i have no idea, we are buying a box printing machine and it requires an air connection capable of delivering 25cfm. the connection is a half in copper pipe. its about 100ft away from the compressor... i have no more information, i can't imaging its that hard to get a rought estimate if it will be able to deliver the proper amount of air. the specs don't give me any more informations the that other then it requires 90 psi... maybe that is the drop i don't know I am not an engineer.