5 replies to this topic

[toonces]

i ask because lallemand posted this on their website:

...for high gravity beers the pitching rate should be increased. The rule of thumb is one million cells per degree Plato per ml.

which seems odd to me. google says that 1 US gallon = 3 785.41178 ml, 5 gallons of wort = 18927.055 mland that 1.092 = 22 degrees Plato. so, for 5 gallons of 1.092 og wort, i'd need 1^06 * 22 * 18927 yeast cells. right? now how many packs is that?

Edited by MtnBrewer, 01 June 2011 - 03:32 PM.
Fixed Title

[denny]

From Jamil at mrmalty.com...Most dry yeast has an average cell density of 20 billion cells per gram. You would need about 9.5 grams of dry yeast if you were pitching into 5.5 gallons of 1.048 wort to get the proper cell counts. (Recently there have been other numbers mentioned for cells/gram of dry yeast and folks have asked me why I believe there are 20 billion cells. I've actually done cell counts on dry yeast and they're always 20 billion per gram +/- less than a billion. Dr. Clayton Cone has also stated that there are 20 billion per gram, and other folks I trust tell me that 20 billion is correct. Until I see something different, practical experience tells me this number is correct.) For dry yeasts, just do a proper rehydration in tap water, do not do a starter.

Edited by denny, 01 June 2011 - 03:12 PM.

[djinkc]

which means ~ 2 packs

[toonces]

so if the danstar/lallemand packs have 11g in them(and it appears they all do), for 5 gallons of 1.070(17 Plato), 1^06 * 17 * 5 * 3785 = 3.217^113.217^11 / 20^9 / 11 = 1.46 packs.so, the highest og for 2 packs would be, working backwards, = plato of 23, or og of 1.096.thanks, denny.

[djinkc]

so if the danstar/lallemand packs have 11g in them(and it appears they all do), for 5 gallons of 1.070(17 Plato), 1^06 * 17 * 5 * 3785 = 3.217^113.217^11 / 20^9 / 11 = 1.46 packs.so, the highest og for 2 packs would be, working backwards, = plato of 23, or og of 1.096.thanks, denny.

Fine, ignore me because I didn't show my work.

[MtnBrewer]

Fine, ignore me because I didn't show my work.

When something is that obvious, you usually don't have to show your work.