General Category > All Grain Brewing
Hochkurz double decoction AND a really long boil for an impy stout?
tygo:
I'm not sure he's going to get another doubling by decanting and adding another 5L. I think the inoculation rate on the second 5L is going to be pretty high. But I don't have any of the reference material or calculators in front of me so I'm not sure.
phillamb168:
Well, this is for a 10 gal batch. I should have time to do another 5L, making it 10 L total/ 5L for each 5 gallon. That seems like it would be plenty?
nateo:
--- Quote from: tygo on March 16, 2012, 08:04:49 am ---I'm not sure he's going to get another doubling by decanting and adding another 5L. I think the inoculation rate on the second 5L is going to be pretty high. But I don't have any of the reference material or calculators in front of me so I'm not sure.
--- End quote ---
IIRC, a 5L starter would make about 300b cells. You'll get the most growth from 25-50m/ml inoculation. I 300b in 5000ml would be 60m/ml. You should still get a decent amount of growth, though not quite as much as a lower inoculation rate would. I don't have a chart in front of me to figure out the growth factor.
morticaixavier:
--- Quote from: phillamb168 on March 16, 2012, 08:32:47 am ---Well, this is for a 10 gal batch. I should have time to do another 5L, making it 10 L total/ 5L for each 5 gallon. That seems like it would be plenty?
--- End quote ---
I would think so.
phillamb168:
10 Gallons didn't make it - thanks to a 120 minute boil, 20-something kilos of grain and related absorption and nearly a gallon's worth of absorption by the leaf hops, I only got 20 L out of the deal. measured OG was 1.115 - without adding any extract - so I'm pretty happy. Holy cow is this a thick sludge-y wort. It already has legs. We're using the hydrometer's share to make some chocolate cookies.
I am not so sure that I'll ever do a decoction again, at least not until I can get a better system in place for handling it. Or perhaps I will do it, but never again for an imperial stout.
What remains to be seen is if the 1L starter will be OK fermenting this stuff down. I'm going to get another starter going when I get home and pitch it at high krausen just to make sure they can do their job.
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