Author Topic: Epoxy Mixers in the Dip Tube ?  (Read 3374 times)

Offline ndcube

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Epoxy Mixers in the Dip Tube ?
« on: June 23, 2010, 02:27:16 PM »
I'm trying to carb a beer to 25 PSI at 43F.

With a 20' x 3/16" line it was still coming out too fast and I was getting half foam.

I dropped 3 of those things in the dip tube and now it's coming up ALL foam.

Can you put the mixer(s) in backwards? Is there another trick?  Maybe I just have to wait a while after depressurizing the keg?

Offline weithman5

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #1 on: June 23, 2010, 02:43:44 PM »
i don't know about the mixers in general, but i have been wondering about a different solution.  is there any reason a separate throttle valve can't be installed close to the keg. this can be used to create a more significant pressure drop near the tank, allowing the flow to become more normalized as you pour.  i suppose a pressure reducing orifice could be put in the line as well. the pressure will equlize slowly between pours but as soon as the pour starts it should drop quickly
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Offline MDixon

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #2 on: June 23, 2010, 03:25:57 PM »
If you are not balanced (too short or too long) then you can get foam.

I'd suggest you know with 100% certainty the keg is carbonated to 25psi and then serve at 25psi with 3/16" beer dispensing hose and you should need in the neighborhood of 8-9' of hose.

Sounds like you definitely have too much hose for either the epoxy doohicky or just using hose.
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Offline ndcube

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #3 on: June 23, 2010, 04:34:45 PM »
I think I have something else going on.  I tried it again w/o the epoxy mixers and the same line and it was all foam again.

I tested the mixer with just water and it definetely seems to be working.  I didn't see any turbulence in the water coming out.

Offline MDixon

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #4 on: June 23, 2010, 04:41:23 PM »
Your line is too long!

Water has no reason/ability to foam.
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Offline aluminumpark

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #5 on: June 24, 2010, 10:06:17 AM »
I'm trying to carb a beer to 25 PSI at 43F.

I think thats more likely to be the problem  are you also serving at 25 psi?  most people serve around 10-15, and thats about the right pressure for normal carbonation at around 40 degrees

at 25 lbs, as soon as the beer leaves that pressure, its going to realease a lot of co2 and cause foaming regardless of how slowly you can pour it

Offline ndcube

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #6 on: June 24, 2010, 11:48:48 AM »
I realize water won't foam but I wanted to see if I was getting any gas bubbles like if my dip tube wasn't sealing properly but I don't think that's the case.

I was hoping to keg some Belgian's. That's why the high carbonation but I may just end up bottling them.

I think the mixer may yet do the trick.  The beer was probably carbed closer to 20psi.  After letting it set 20psi is about when gas started hissing while I turned up the regulator so I left it there and after sitting another 12 hours the carbonation was alot better with 1 stick and a 10' line.

I think my problem was agitating the keg yesterday and letting everything get too warm while I was working on it along with the regulator being up to high.

I'll do some more testing and maybe turn the regulator up and wait a couple weeks to see what happens.


Offline MDixon

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #7 on: June 24, 2010, 03:17:29 PM »
Maybe third time's the charm... ;)
Your line is too long

1 - keg needs to be properly chilled and fully carbonated
2 - set the pressure to dispense at the carbonation pressure
3 - set the line length to the pressure

25psi = 8-9' of 3/16" beer dispensing hose

My suggestion -
1 - chill the beer to 43F
2 - carbonate to 25psi (if that is the desired level)
3 - dispense at 25psi (if that is where you carbonated to)
4 - remove the epoxy thingamajig and set the line length to what it should be

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Offline ndcube

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #8 on: June 24, 2010, 03:30:00 PM »
Ha.  Sorry.  I wasn't ignoring your advise.  I just like playing around.

How did you arrive at 8-9'?

Offline pjj2ba

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #9 on: June 24, 2010, 09:38:07 PM »
I'm glad to see epoxy mixer use spreading.  The epoxy mixers should work, so the problem must be elsewhere,  There was a recent thread on another forum where people were having unsolvable foam problems.  Someone finally noticed that the bubbles were forming at the disconnect.  On closer inspection they noticed a flaw in the opening of the disconnect itself, that was results in extra turbulence, and foam.  Someone else noticed the same thing on their foamy tap.  Looks like it might have been a production issue.

Offline MDixon

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #10 on: June 25, 2010, 04:33:25 AM »
The resistance value of 3/16" is ~3psi/ft, simply divide the pressure by that value and it will yield the approx length of hose required to balance the system.
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Offline dak0415

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #11 on: June 25, 2010, 06:01:19 AM »
Does anyone have the McMaster part # for those mixers?
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Offline ndcube

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #12 on: June 25, 2010, 06:04:38 AM »
Does anyone have the McMaster part # for those mixers?

This is what I ordered.
74695A58


Offline ndcube

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #13 on: June 25, 2010, 06:11:52 AM »
The resistance value of 3/16" is ~3psi/ft, simply divide the pressure by that value and it will yield the approx length of hose required to balance the system.

I'm not so sure about that.

My 5 ft line works pretty perfect at 10psi (w/o a mixer) which would mean it's closer to a 2psi per foot drop.  That is the value that I've seen most oftern during my searching.

I've also read that as you get in the upper psi range like around 30 the drop is < 1.  In other words the tubing resistence isn't constant with pressure.

Have you ever carbed a beer to 25psi and served it w/ 8-9' lines?

Offline nyakavt

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Re: Epoxy Mixers in the Dip Tube ?
« Reply #14 on: June 25, 2010, 06:51:56 AM »
The resistance value of 3/16" is ~3psi/ft, simply divide the pressure by that value and it will yield the approx length of hose required to balance the system.

I'm not so sure about that.

My 5 ft line works pretty perfect at 10psi (w/o a mixer) which would mean it's closer to a 2psi per foot drop.  That is the value that I've seen most oftern during my searching.

I've also read that as you get in the upper psi range like around 30 the drop is < 1.  In other words the tubing resistence isn't constant with pressure.

Have you ever carbed a beer to 25psi and served it w/ 8-9' lines?


I agree, I've used lines that were much longer than necessary and it doesn't cause excessive foam, just a very slow pour.  You can see the difference if you hook up a long line and a short line back to back on the same keg.  The resistance of tubing is not a static value, it changes based on the flow rate.  If you pour slowly at say 80 oz/min the resistance is closer to .94 psi/ft, whereas a very fast pour of 192 oz/min would be more like 4.7 psi/ft (see this guide from the inventer of Ventmatic faucets (thanks to P-J for sharing this). 

When balancing a system you need to pour slowly enough so that carbonation does not come out of solution, and have enough resistance in the line to dissipate all the pressure at the regulator.  So a high carb beer hits you twice, first you need a long line to dissipate all the pressure at the regulator, and you need to pour slower so the resistance of your tubing decreases, necessitating an even longer line.  To avoid having 20+ foot lines, looks like the mixing nozzle is the way to go.

Another thing that can cause foaming is a clogged dip tube or a perforated dip tube, which sometimes happens if they crack.  Sounds like you got it sorted out though.