davecuds wrote:Ozkev,
How did the 220L corn mash go?
I have access to heaps of 190L fermenters (olive drums) so im keen to do some bigger ferments as well
Went all to plan. It was a mix n match type day to get some ideas. The main thing I'm trying to do is not manually handle it a lot. So from start to finish I took about 13 hours, but I didn't do a lot in that time, it was just leave it alone. I mashed half in the fermenter and the other half in my mash tun.
Starting early morning in the fermenter I dumped 20kg crushed corn and poured on 70L of boiling water, I had my HLT on my 3V system set to 98c. Put the lid on the fermenter and left it for a couple of hours.
Refilled my HLT and got it back to the boil.
Threw 10kg corn into my Mash Tun, and poured on the boiling water.
A couple of hours later I checked the fermenter's mash and it happened to be on 66c. I added 1kg malted grain and some enzyme to start the starch->sugar conversion, gave it a good stir and put the lid on it and walked away.
Once the Mash tun got down to grain temp I added 8kg malted grain some enzyme, and stirred it in.
At that stage my sons computer gear rocked up so I spent the afternoon building his pc, and didn't check the mashes at all.
Late evening I went and gave them both a good stir and got it ready for fermenting. The corn/grain in the fermenter was left in there, and the mash tun was drained via the false bottom and sparged (yes I know normally you don't sparge corn mashes) until my fermenter was full.
I worked out in the fermenter I hit 72% efficiency overall, and the mash tun I hit 80%.
In my experiments I've also tried to use the cracked corn in my mash tun without crushing it further. It made draining and sparging really easy, but I only got 60% efficiency.
I prefer not to ferment on the grain. What I would like to do long term is get another 200/220L drum, aka mash drum. I'll put a false bottom in it. Then my plan is to crush the corn with 1 quick pass of the Corona mill. I'll dump 40kg corn in the mash drum and top it up with 140L boiling water. The water will be added as 70L, then about an hour later another 70L as that's what my HLT can do easily (82L total capacity). Giving it a good stir at both times when adding water. Then leave it to cool to 66c by itself. With the thermal mass I assume it will take 3 to 4 hours. Once I hit 66c, I'll add my grain and enzyme, stir and leave it to cool until the evening. Then my plan is to drain it using the false bottom to separate out the grain. Then I will sparge the mash drum with cold water and draining into the fermenter until my fermenter is full. If I allow 75% eff I should get 1.055 OG, or 80% 1.057. Now I know purists would say no to any sugar, but if I add 4kg white sugar it is a very low % of total sugars and would bump it to an OG 1.064.