Hi All
Having a look through the reecipe DB and have seen many different grain weights for certain beers . I am sure it depends on the beer style but what is the maximum grain weight you could have for a 23l batch
Cheers
Aw
What about BIAB ..
How do you calculate your maximum grain bill for a pot for single batch amounts?
ie. how much room does 1 kilo of grain take up in a pot?
Tom
In either case, the max grain size becomes a limitation of the equipment being used to mash it, whether that is a tun, or biab.
grain volume is 0.652 L per kg of grain (according to beersmith default). Then you have the grist/ liquor ratio, which (for conventional tuns) is around 2.5-3 L/kg. You can mash thicker, and you can mash thinner...but you can only go so far. 2L/kg would probably be the minimum
practicable amount (and personally I wouldn't want to mash that thick).
biab is somewhat different, as you need to allow, instead of grist ratio, for the water for your preboil volume + loss to grain, as well as the displacement of the grain itself. Thirstyboy did a post only a few days to a week ago (from memory) in (i think) either the biab thread, or bjorn's thread about his small pot biab attempt. I'm not familiar enough with biab to be confident in my answer, so might wanna look that up. Someone did mention, though, that the short rule of thumb is pot size/8 = max weight of grain (to be easily done...not a definitive number)
Either way, you can mash more grain in a tun than you can biab in a pot (if the pot and the tun are the same size), because in the biab pot, you need to fit everything in the pot in one hit; with a tun, you only need to fit the mash water, and then it's drained for the sparge water.