From the HBD Archive
From: pms@Sun.COM (Patrick Stirling)
Subject: Yeast pitching
Date: 1989-11-14 16:59:06 GMT

I've tried several methods of adding yeast to wort: sprinkling the dry yeast,
rehydrating it in warm wort, and rehydrating in warm water. I haven't found
any appreciable difference. Rehydrated yeast should be better on paper,
because that way you'll find out if the yest is OK before it's too late! Also
the yeast gets a head start and should get going faster.

I have also pitched at temperatures varying from 70F to 100F. At higher temps
(>80 or so), the fermentation sometimes (usually!) ends prematurely, at around
"half" the SG (e.g. 1.050 -> 1.025), but at the proper temp it ferments to
closer to 1/4 SG (1.050 -> 1.013).

I don't like the idea of stirring, it sound too risky to me, and slooshing in
a cup or so of rehydrated yeast should cause plenty of turbulence by itself.
You wouldn't want those little yeasties to get spread out and lonely in all
that wort after all, would you?!

Oh, about Guy's BTU calculations. There's no time in the BTU's because it
doesn't matter how slowly (or fast) the heat is added - 1BTU raises 1lb water
1F, period. So you have to add 14,880BTU to get your 31 gal to a boil from
about 150F (your 60F raise). Stoves should be rated with BTU and time, e.g. a
15,000BTU/hr stove would take an hour for your set up. Unfortunately I have no
idea whether 15k BTU/hr is a table top range or a blast furnace!


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