air in beer line

[loady]

Any idea what would be the cause of this ? is it worth just replacing the rubbers on the posts and dip tube ?..i can see it bubbling up from where the pipe goes into the JG fitting, its a new JF fitting so i am sure its not that.

 

[Runwell-Steve]

The only way air can possibly get in a beer line is if the pressure inside the keg is lower than the outside pressure. If the pressure in the keg is higher than the outside pressure which is normal then no air can get in, and if the seal wasn't secure then beer would be leaking out.

It is much more likely this is just CO2 that has come out of the beer into the pipe.

 

[Fil]

+1 its higher pressure inside the system so if there was a leak you would have beer everywhere.. so its co2 thats come out of suspension in the beer and done what gas does in a liquid, its risen to the top.

the gas that escapes in a line will manifest itself with a spluter when you open the tap, if left untouched for a few weeks it can cogh and splutter the first 1/4 pint into foam in the glass but as soon as all the gas is pushed thru your back to a good pour.