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Closed loop - Gauge pressure vs fill volume

Closed loop - Gauge pressure vs fill volume

Closed loop - Gauge pressure vs fill volume

(OP)
Hi all, please help with the below question.

Consider a 300ft , Dia = 1-inch ID copper pipe closed loop system laid horizontally i.e., elevation = 0.

To fill the system fully with water we would need:
System Volume= (3.14/4)x(D^2)x 300' = 1.636 ft^3 = 12.24gal
A pressure gauge in the loop will be reading 0 psig(atm pressure) when the above system is filled with 12.24gal.

How much more volume is to be introduced into the system to raise the fill pressure to, say 10 psig?
In other words, what is the relation between volume of fluid in a closed loop and static fill pressure in a system?

Thanks in advance.
 

RE: Closed loop - Gauge pressure vs fill volume

(OP)
Something to do with "Bulk Modulus" equation?

RE: Closed loop - Gauge pressure vs fill volume

a few drops could do it

i would test this small volume with a hand pump instead of a powered pump.

this could overpressure in a real hurry

RE: Closed loop - Gauge pressure vs fill volume

(OP)
That makes sense!!
Thanks very much BigInch and vesselfab for the help.

 

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