Safe pressure for filling glass bottles with a CPBF

[tanukibrewer]

Gday AHB
Planning on setting up my CPBF shortly and I'm wondering what pressure is safe to use with glass bottles.
I run my keg setups at 110-140kpa (15-20psi) with about 8m-10m of line and my beers always pour very well (I know many people run half this pressure with much shorter line).So I am wanting to fill my bottles straight from the kegs in the fridge at my serving pressure,is this too high?
I intend to build a housing for the CPBF as some of the AHB brewers have done with a perspex door
Any info or advise would be greatly appreciated

 

[sp0rk]

if you fill at your serving pressure, you will get a lot of foaming (know this from experience )
I serve at 80kpa and fill at around 110-130kpa
much higher and my bleed valve starts to leak

 

[squirt in the turns]

I have spoken to Brennan Fielding of Burleigh Brewing (a former homebrewer) about this. His advice was to purge and fill at 200kpa or higher. My reaction was "seriously?! They don't explode?". Well, the answer to that was yes, it's a possibility, wear protection. This bombproof enclosure thing is probably a good idea. Their bottling line runs at a similar pressure and the number of explosions is apparently inconsequential when compared to the total volume bottled. Of course, they're using brand new bottles.

The rationale behind this is that purging and venting a bottle once at 2 ATM results in a 50/50 air/CO2 mix (~10% O2). Purging it again (and maybe again after that) results in a negligible amount of O2 remaining, which, along with an oxygen-absorbing cap, is the key to successfully storing anything bottled under counter pressure for longer than a few days.

 

[tanukibrewer]

Thanks Squirt in the turns.Very usefull information,think I will go it at my serving pressure to start with and see how that goes.Mainly just going the CPBF for doing up takeaways so length of storage in the bottle is of secondary consideration atm.Cheers

 

[sp0rk]

Like I said mate, if you fill at serving pressure you're going to get a bit of foaming
the principle of a CPBF is that the higher bottle pressure doesn't allow the CO2 to come out of solution
you can slightly counteract this by getting your bottles nice and cold before filling them

 

[tanukibrewer]

Righto Spork, I will keep my keg pressures the same, just up the pressure by 30-40kpa when I purge/pressurize and use cold bottles.cheers for that

 

[Amber Fluid]

Like I said mate, if you fill at serving pressure you're going to get a bit of foaming
the principle of a CPBF is that the higher bottle pressure doesn't allow the CO2 to come out of solution
you can slightly counteract this by getting your bottles nice and cold before filling them

Interesting you say this Spork as I have never had any issues with a CPBF at pouring pressures. In fact, I have my CPBF mounted on my collar and permenantly ready to go. I just need to ensure the gas line is from the same manifold as the keg. Nevertheless, I can understand your reasoning behind it.
Next time i might up the pressure and see if it makes any difference......

 

[tanukibrewer]

Interesting comments Amber Fluid cheers mate

 

[TidalPete]

Interesting you say this Spork as I have never had any issues with a CPBF at pouring pressures. In fact, I have my CPBF mounted on my collar and permenantly ready to go. I just need to ensure the gas line is from the same manifold as the keg. Nevertheless, I can understand your reasoning behind it.
Next time i might up the pressure and see if it makes any difference......

Like Amber Fluid my CPBF is permanently fitted to the keezer collar & like him I've been filling both glass & plastic at serving pressure. When foaming starts (Mostly when the beer reaches the neck of the bottle & thus fills at a faster rate) I just wind back the pressure to slow filling down a smidgen.

I'll be giving spOrk's advice a go next time too..