Prv's on cornelius kegs

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bluc
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Prv's on cornelius kegs

Post by bluc »

Wondering how to calculate spring strength needed for x pressure on a prv.

I age in corney kegs and was content knowing they have a prv. A mate mentioned it may not be ideal. After some research i see they have max 100psi.
Looking at this purely in worse case scenario of a fire these things would be bombs.
I would like to set psi to maybe .25psi or .5psi max.

How do i work out spring strength needed or should i remove spring and just let it vent the mechanism as needed.
I want to keep bugs out and not create bombs all at same time.
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Re: Prv's on cornelius kegs

Post by The Baker »

Just thinking.

Maybe we are solving the wrong problem.

If you don't want it to be a bomb, in case of fire, because of having no pressure release;

you could install pressure releases and have high pressure streams of FIRE from these orifices!!!

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Re: Prv's on cornelius kegs

Post by bluc »

Or even better low pressure fire streams rather then high volume explosions..
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Re: Prv's on cornelius kegs

Post by shadylane »

Instead of trying to modify a korny keg PRV.
I'd recommend building a simple manometer.
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Re: Prv's on cornelius kegs

Post by bluc »

Yea good idea link em all up into one manometer. Just want a way for them to "safely" vent in case of fire and not build pressure and explode..
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Re: Prv's on cornelius kegs

Post by shadylane »

The Baker wrote: Fri Jun 25, 2021 12:59 am Just thinking.

Maybe we are solving the wrong problem.

If you don't want it to be a bomb, in case of fire, because of having no pressure release;

you could install pressure releases and have high pressure streams of FIRE from these orifices!!!

Geoff
I must be getting old.
I just realized what he wanted the PRV for. :lol:
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Re: Prv's on cornelius kegs

Post by TwoSheds »

One of-the-shelf or easily assembled option would be a spunding valve:

https://www.morebeer.com/products/spund ... -lock.html

I'm thinking about fermenting in Corneys (they're a lot lighter and have better handles than glass carboys) so was thinking a pin lock airlock which would also provide the same relief, but long term you'd have to go back and refill it.

But I think in a fire the poppet and lid seals would melt and relieve pressure before it got too high anyway, just a though.
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Re: Prv's on cornelius kegs

Post by howie »

bluc wrote: Thu Jun 24, 2021 10:15 pm Wondering how to calculate spring strength needed for x pressure on a prv.

I age in corney kegs and was content knowing they have a prv. A mate mentioned it may not be ideal. After some research i see they have max 100psi.
Looking at this purely in worse case scenario of a fire these things would be bombs.
I would like to set psi to maybe .25psi or .5psi max.

How do i work out spring strength needed or should i remove spring and just let it vent the mechanism as needed.
I want to keep bugs out and not create bombs all at same time.
i believe there is a 35psi, 65 psi and a 100 psi prv that is compatible with the corny keg.
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rubberduck71
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Re: Prv's on cornelius kegs

Post by rubberduck71 »

Depending on your location, you may be able to find corny lids that have airlock built-in: https://www.homebrewing.org/NEW-Corneli ... 2qEALw_wcB
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Re: Prv's on cornelius kegs

Post by cob »

rubberduck71 wrote: Fri Jun 25, 2021 11:10 am Depending on your location, you may be able to find corny lids that have airlock built-in: https://www.homebrewing.org/NEW-Corneli ... 2qEALw_wcB


aging strength ethanol and plastic don't mix.

The original o-rings melt at 300f. ptfe melts at 650f. 7 ptfe o-rings are needed to make a corney safe for ethanol.

If you build a manometer it should be stainless or copper, and don't gang them together unless sized correctly.

no plastic.

edit ; the gasket/seal on the PRV on a corney is also buna rubber.
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Re: Prv's on cornelius kegs

Post by bluc »

howie wrote: Fri Jun 25, 2021 7:13 am
bluc wrote: Thu Jun 24, 2021 10:15 pm Wondering how to calculate spring strength needed for x pressure on a prv.

I age in corney kegs and was content knowing they have a prv. A mate mentioned it may not be ideal. After some research i see they have max 100psi.
Looking at this purely in worse case scenario of a fire these things would be bombs.
I would like to set psi to maybe .25psi or .5psi max.

How do i work out spring strength needed or should i remove spring and just let it vent the mechanism as needed.
I want to keep bugs out and not create bombs all at same time.
i believe there is a 35psi, 65 psi and a 100 psi prv that is compatible with the corny keg.
35 is a lot less then 100 but still bit high imo.
Those air lock lids could be useful but agree plastic is a no no.
I still think making modifying the built in prv would be ideal solution..
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Re: Prv's on cornelius kegs

Post by bluc »

Bit worried about suck back with a manometer. Matinence free solution is something i would prefer.
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Re: Prv's on cornelius kegs

Post by The Baker »

I believe a manometer can suck OR blow.

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Re: Prv's on cornelius kegs

Post by Yummyrum »

bluc wrote: Fri Jun 25, 2021 7:54 pm Bit worried about suck back with a manometer.
I wouldn’t be bluc , pressure and vacuum indication and relief in one simple solution :thumbup:
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Re: Prv's on cornelius kegs

Post by Setsumi »

just remove the lid seal. it will keep bugs out an vent as needed. yes you will loose some alchohol if you have extreme high temprature... but isn't that whats happening with barrel aging?

edit to add, if you have a fire that bad to create bombs you are screwed unless you are legit.
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Re: Prv's on cornelius kegs

Post by rubberduck71 »

cob wrote: Fri Jun 25, 2021 3:24 pm
rubberduck71 wrote: Fri Jun 25, 2021 11:10 am Depending on your location, you may be able to find corny lids that have airlock built-in: https://www.homebrewing.org/NEW-Corneli ... 2qEALw_wcB


aging strength ethanol and plastic don't mix.

The original o-rings melt at 300f. ptfe melts at 650f. 7 ptfe o-rings are needed to make a corney safe for ethanol.

If you build a manometer it should be stainless or copper, and don't gang them together unless sized correctly.

no plastic.

edit ; the gasket/seal on the PRV on a corney is also buna rubber.
+1 to the no plastic rule. My bad: I misread the OP. I somehow processed it as "fermentation stage." I have 3 teenage children who have caused irreparable brain damage. That's my story & I'm sticking to it!!! :crazy:

I did a google search for stainless steel airlock, but didn't find anything useful.

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Re: Prv's on cornelius kegs

Post by bluc »

Yummy can you buffer a manometer so when it sux back it doesnt suck fluid into the spirit? Maybe a double manometer??
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