5 gal carboy for long term Brett fermentation of a 2.5 gal batch?

[ahpsp]

All of my current fermentation vessels are 5+ gallons. I'd like to split a Tripel I will make soon after primary fermentation is complete, bottle half, and repitch Orval dregs into the second half. I'm concerned that my carboys are too big for that, but I'd prefer to avoid buying something else.

I have no CO2 system. I believe I've read about adding a bit of either sugar or fresh wort to the secondary as a means of boosting initial co2 production, then just basically not touching it to preserve the blanket.

Thoughts?

 

[dcHokie]

All of my current fermentation vessels are 5+ gallons. I'd like to split a Tripel I will make soon after primary fermentation is complete, bottle half, and repitch Orval dregs into the second half. I'm concerned that my carboys are too big for that, but I'd prefer to avoid buying something else.

I have no CO2 system. I believe I've read about adding a bit of either sugar or fresh wort to the secondary as a means of boosting initial co2 production, then just basically not touching it to preserve the blanket.

Thoughts?

I wouldn't want to chance long-aging a beer with that much head space. Do you have the capacity to scale up the tripel to a 7.5 gallon batch?

 

[BryanThompson]

Or just build a starter and dose half the bottles with brett and without/less priming sugar.