carbonating in "Better Bottle" PET Carboy

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Can anyone see a problem in carbonating root beer with dry ice in a 6
gal "better bottle" PET Carboy?

I would seal it up, with pressure regulator that would not allow
pressure to get past 15psi...

Would a PET carboy have any problem handling that?


Re: carbonating in "Better Bottle" PET Carboy


On 26 Sep 2005 19:59:19 -0700, jackjohansson@gmail.com wrote:

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You could email the people who market them and ask.

Or you could *experiment*, but not filled with root beer :)

steveb

Re: carbonating in "Better Bottle" PET Carboy


jackjohansson@gmail.com wrote:
: Can anyone see a problem in carbonating root beer with dry ice in a 6
: gal "better bottle" PET Carboy?

: I would seal it up, with pressure regulator that would not allow
: pressure to get past 15psi...

: Would a PET carboy have any problem handling that?

    You must have a cheap source of dry ice... :)  I don't know if the 6 gal PET
carboys are pressure-rated... I'm pretty sure they are not.  

    People *have* been pretty successful (myself included) in making mini-kegs out
of 2-liter and 3-liter PET soda bottles.  Not exactly the size you're looking
for, but
they *are* pressure rated.  People have hydro-tested them to more than 100 psi
without
bursting.  Even at that, you'd need pressure relief for dry ice.  People have
also
made bombs out of 2-liter bottles and dry ice without pressure relief.

    Consider this:  A 1 liter bottle filled with 15 psi of air contains 100 joules
of energy.  Dissipated in 1/100th of a second (e.g. when the bottle bursts)
that's
10kW of power, or 13 horsepower.  Not earth-shattering, but not exactly safe.

    If you dial that up to a 10 liter bottle, the energy goes up by the same
factor.  If you increase the pressure, the energy goes up by the same amount.  
Considering that you're looking for 6 gallons at soda carbonation pressures
(probably
about 30 psi), that's about 5kJ of energy.  You definately don't want to be near
that if it bursts.

-Cory

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Re: carbonating in "Better Bottle" PET Carboy



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If I remember right CO2 must be pressurized to 82 atmospheres at 30 C. to
make it liquid. Each atmosphere is 16 psi 82X16 = 1312 psi that the bottle
can get up to. I do not know of too many plastic bottles that can withstand
that kind of pressure. The metal syrup containers that are rated for 175 psi
may also become a bomb.

I do have a suggestion that you may try before the event. rent a CO2 bottle
with a regulator and get some fish tank hose with a bubbler and put the
bubbler in the bottom of the tank with some dry ice to get the effect. just
turn on the CO2 before the event to put CO2 in the mix  and the dry ice
should keep the CO2 level up. CO2 is not that expensive.



Re: carbonating in "Better Bottle" PET Carboy


BTW: My idea about the CO2 gas is to be used with the open garbage
container. DO NOT USE WITH A CLOSED PET BOTTLE.

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