Let's see how my brew day goes and if manage to hit my pre boil gravity 1.117. Cut down the malt bill a bit because my refractometer scale only goes to 1.120 and I would at least like to have an idea of what my SG is before boil. I'm now going to mash 18.3kg grain with the total water amount being 48l for a 23l batch size. It's hard to predict mash efficiency on this kind of a project, but I set it to 55% in BrewMate. I can barely wait to get started tomorrow morning, it's gonna to be a loooong brew day.
Yesterday was the longest brew day so far (11h). Did three mashes 6,1kg each, the first with 26l water and ended up at 1.052 which dropped down to 1.047 after I sparged with 5 litres.
The sack of base malt I got had a way too fine crush, and it caused me alot of headache in the last two runs. During the second mash I started to get problems with the mash getting stuck. I did stop the program a couple of times to stir and was able to get some flow, but my SG was only 1.084 after the second run. I now knew I wasn't gonna hit my pre boil gravity, never the less get 23 litres into the fermenter.
At the beginning of the third mash I was screwed. The pumps just wouldn't push any wort through the malt bed, so I took out the upper screen and tightened the malt pipe back in. Then I put the program in pause and ran wort into a bucket which I poured back onto the maltbed. That way I got a quite nice and loose mash, which I just let sit for 40 min just to even get some conversion out of the last batch of grain. The gravity luckily went up to 1.103, and though I didn't hit my target, and the mash efficiency was ridiculously low, I still was pleased to go over 1.100 all grain.
I decided to further bump up the gravity by throwing in all the DME I had on hand (250g) and 200g of table sugar into the boil. And after cooling the wort down to 18 C, I measured an OG of 1.140.
After taking a closer look at my refractometer I noticed that even if there is no 1.130 marking, the lines goes to 1.136. And when measuring, the refractometer floated about 4 points above that last line.
Now I just hope this bad boy will ferment out and that the final gravity will be around 1.030- 1.040. I did only get 15 litres into the fermentor, so with my 6,5 litre starter with two vials of yeast, I at least didn't under pitch. :rockin: