oxygen-impermeable serving lines

[Jayjay1976]

I hope someone publishes data on the flow resistance of EVAbarrier. I think it could be extrapolated with a little experimentation but it would be cool to have hard data. I'm actually kinda surprised that KegLand didn't provide that from the outset.

 

[Cavpilot2000]

Why do you need hard data on the flow resistance of the EVA Barrier? Just run a line a little longer than you expect you'll need and then trim it until it's right. You'll waste a few feet, but the stuff is so cheap who cares? It's not like you don't make tweaks to calculated line length for every other tubing out there.
5 minutes of trial and error is as good as all the data in the world.

 

[eric19312]

I don't think any of the balancing calculators know about this EVA barrier tubing. Here is @Bobby_M 's page - he tested and 5.5 feet of 4mm tubing is fine for 9-14 PSI serving pressure. I think he was originally saying 7' so when I installed that is what I did. It is balanced just fine. I get nice pours and keep my serving pressure at 12 PSI and serving temp at 39F. Just forget about the calculators and buy this stuff.

https://www.brewhardware.com/product_p/evabarriertubing4mm55.htm
I also did my gas lines to eliminate O2. I also replaced all barbs with the duo tite fittings. They are not that expensive and I thought likely to last longer and less likely to leak than stretching the tubing.

 

[SanPancho]

The problem with your references is they don't show where the resistance numbers came from. They don't reference an authoritative source. Fluid Dynamics is settled and well understood science. If you are going to argue against physics, you better have some very bullet proof data to back you up. You haven't shown that.

Brew on

thats Why we agree to disagree.
because the problem with engineers is they always think they know everything and are never wrong. Even when they ignore essential Ideas about tubing, yet claim to understand the physics. And especially when they refuse to explain why real world experience shows something works, despiite their claims to the contrary.

 

[SanPancho]

I don't think any of the balancing calculators know about this EVA barrier tubing. Here is @Bobby_M 's page - he tested and 5.5 feet of 4mm tubing is fine for 9-14 PSI serving pressure. I think he was originally saying 7' so when I installed that is what I did. It is balanced just fine. I get nice pours and keep my serving pressure at 12 PSI and serving temp at 39F. Just forget about the calculators and buy this stuff.

https://www.brewhardware.com/product_p/evabarriertubing4mm55.htm
I also did my gas lines to eliminate O2. I also replaced all barbs with the duo tite fittings. They are not that expensive and I thought likely to last longer and less likely to leak than stretching the tubing.

I know morebeer got their length recommendations from the supplier. Whether it was calculated/tested or just trial and error wasn’t clear.

 

[camonick]

 

[stickyfinger]

i have been watching some KegLand videos today and checking out products. They are really innovative! Have some cool looking stuff - those tiny cheap secondary regulators and other stuff. I think these "pluto guns" are what i would be interested in. I have been using picnic taps coiled on top of my kegs in my beer fridge for simplicity, ability to soak them easily in cleaner, keep the beer ice cold, but I think these would be a very cheap upgrade for my picnic taps, lol. Too bad they are out of stock. I can get the barbed one to try it out i guess and then get the duotight ones when i upgrade my entire tubing system. i should be able to just coil the EVABarrier up and rest the pluto gun on top of each of my kegs.

Nylon Reinforced Black Pluto Dispensing Gun (duotight compatible)

 

[kevink]

I just got 4mm ID EAVbarrier over a 10mm (0.394") barb no problem. This kind of opens up possibilities for people wanting to use the 4mm tubing on their gas side.

 

[day_trippr]

You might want to describe your actual process for posterity sake, because when I fit the 5mm ID line over a 3/8" barb (slightly skinnier than your 10mm) I needed to use both a heat gun and a swaging tool.

With the tool (or something similar that won't screw up the liner) it just takes time to keep expanding the end until it can slip over the barb (heat, stretch, cool, repeat)...

Cheers!

[edit] fixed broken image

 

[stickyfinger]

I just got 4mm ID EAVbarrier over a 10mm (0.394") barb no porblem. This kind of opens up possibilities for people wanting to use the 4mm tubing on their gas side.

wow! that seems like a stretch.

 

[kevink]

You might want to describe your actual process for posterity sake, because when I fit the 5mm ID line over a 3/8" barb (slightly skinnier than your 10mm) I needed to use both a heat gun and a swaging tool.

View attachment 679518

With the tool (or something similar that won't screw up the liner) it just takes time to keep expanding the end until it can slip over the barb (heat, stretch, cool, repeat)...

Cheers!

Two things are key. Having the right size tools and not using too much heat. I dipped about 3/4" of tubing and the tool into 175 degree water for 5 seconds and then stretched it with the punch on the left. I then did the same thing with the punch on the right. I then did it again, but instead of a punch I inserted the barb. You just have to work your way up in size. You'd never be able to push a 10mm barb in 4mm tube without first opening it up.

Water temp seems very important. I first tried it with near boiling water, but it made the tube so soft that when I tried to insert anything, it just squished up and folded. It needs some strength to resist folding yet still be soft enough to stretch.

 

[Bobby_M]

Keg lube on the tool makes it easier.