does nylon, pass gas?

[bracconiere]

so i had a serious leak, but now am curious.....i use a bunch of nylon tees for my gas tubing and to find my serious leak (what keg) i disconected all of them....but when i checked the gas tubing to see if that's where the leak was after a day sitting...i got a very small pressure release from my reg....not a big deal, but something that i'm curious if i should fix just because i found out? might be an extra month out of a tank......

i know people talk about EVA here a lot....but i thought my silicone was good enough.....


and on a side note, one of my QD's is 20 years old, how often should a person replace them? (for the serious leak)


i know i'm not fluent at human, but i'll apreciate any replies....

 

[Gruel]

I think you can google diffusion rates through various plastics (permeability), but I'm pretty sure that with most any material to get a macroscopic volume through you'd need a large area and/or a very thin membrane and/or very high pressure difference. A small leak at a barb connection seems the more likely culprit to me.

 

[bracconiere]

now that you mention it....when had to cut my old vinyl tubing off the barbs, i knicked a couple.....and reused the tees.....

 

[Vale71]

Nylon is one of the best plastics as far as gas permeability goes so I'm pretty certain that's not it...

 

[bracconiere]

Nylon is one of the best plastics as far as gas permeability goes so I'm pretty certain that's not it...

then as gruel said, probably one of the nicks or a leaky, poppit in one of the QD's......on a plus, think i found my serious leak....either the PRV on a firestone lid i can't find a replacement PRV for, and will have to wait till next month to buy a new lid for....(my oldest keg dates back to 96....i already replaced the o-rings recently, but not the PRV)


i tried vasoline, but if this is it, that wouldn't even get it tight.....