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Compressed Air Leak into a Liquid
2

Compressed Air Leak into a Liquid

Compressed Air Leak into a Liquid

(OP)
Does anybody know how to calculate the CFM on a compressed air leak when the air is not blowing into the atmosphere but into a liquid like the pickling acid?

I am trying to replace a compressed air bubble-system agitator with an energy efficient eductor in a tank mixing application.  However, I do not know how to estimate the amount of air that is currently being blown through the agitator.  I know that the agitator is currently blowing compressed air from a 1/8” pipe, and the CA line pressure is 95 psig.  I do not know the density or the temperature of the acid being mixed but I can easily get that information if I find some use for it.  Is there an equation for CA leaks that deals with the situation of leaks underwater or other liquids?

Please help

RE: Compressed Air Leak into a Liquid

My take on it would be to just adjust the pressure drop across the hole/holes by the hydraulic pressure of the solution.  So maybe a couple of psi if it is not deep.  Or I would ignore it as it is not going to affect your answer much anyway.  You are probably choked in the 1/8" pipe.

Regards
StoneCold   

RE: Compressed Air Leak into a Liquid

I'd ignore it unless it's a really tall tank winky smile  

If the air pressure is 95 psig inside the line and it's discharging to the static head inside a tank, you are almost certainly have choked flow through the orifice (dP/Pinlet > 0.5 where Pinlet is the absolute pressure).  If you do have choked flow, the static head in the tank is not going to affect the flow rate.

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