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Rob2010SS

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I have a question regarding the SSBT Unitank and something I'm thinking of trying to save me some headaches.

I have roughly 7 gal of a sour sitting in a 7 gal unitank. I'm going to be adding 4 lbs of fruit to it. However, given how high the level in the tank is, I think if I add the fruit in the given situation, it'd overflow out the blowoff tube. What I'm contemplating doing, is removing the blowoff tube and using one of those 1.5" TC caps to block off the blowoff. I would put that right here... (see red circled spot in the picture)

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I would then leave the PRV on the top of the tank in place, should the PSI from any renewed fermentation from the fruit start building up CO2. Once it's time to transfer, I would remove the PRV from the top and use the Spike Brewing manifold to push the beer out of the tank.

In my head, seems like it would work. Any reasons why I SHOULDN'T do this? Am I missing something here?

Typically, I've been pulling 2 gallons out and putting that in a 3 gallon fermonster and splitting up the batch. However, that's usually when I'm doing a lot more fruit then this. With this small amount of fruit, I'm trying to get away from that, as that 2 gallons in the fermonster can end up with some differences from the dry hop getting split up and the fruit addition. I really want to do all of this in one shot so the batch is uniform throughout.

Thoughts?
 
How much sugar is in the fruit you're adding and how much headspace do you have? If the answers are "a lot" and "not much," I suspect you could end up with the PRV functioning as a blowoff, i.e. end up with beer flowing through it and/or clogging it.
 
It's 4lbs of apples that I'm going to peel, core, and chop up into chunks. I typically don't get a whole lot of fermentation activity on whole fruit like that. It's usually quite minimal and with apples, I would expect it to kind of follow suit, but I've been wrong before.
 
How much sugar is in the fruit you're adding and how much headspace do you have? If the answers are "a lot" and "not much," I suspect you could end up with the PRV functioning as a blowoff, i.e. end up with beer flowing through it and/or clogging it.

As far as headspace, to give an idea, I never had anything come out of the blowoff during active fermentation. So, it handled that OK.
 
It sounds like your risk would be fairly low. Keep in mind that it will take the yeast more time to ferment the fruit's sugars under pressure than it would otherwise. How much pressure builds will depend on how much sugar. But basically, you have a spunding valve set to (I think) 15 PSI.
 
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