Since kegs pull from the bottom, the beer won't be sitting on the trub. The first thing it will pull will be the trub, and the small amount that's left in there won't cause any issues. The only time I could see a problem is if you have some hop material in the keg. That can clog the post, which is a pain in the butt. As long as you cold crash and let it settle for a while, pull off the trub, and then carbonate, I think you'll be fine. You may have issues with sediment being pulled if you let it sit for a while between servings, but even then, it'd be a small amount. I see no reason not to do this, except, again for the hop material or anything else that might clog the post.
What? If he ferments in a keg and then serves in that keg, he is NOT going to blow off all the trub. He's going to create a hole around the dip tube that will pull clean beer. All the hot break, debris, lees..etc will still sit in a big glob around the tube.
When I ferment in my sanke kegs, I transfer to a serving keg with a normal dip tube just like a corny keg. When I blow off the yeast, it runs clear... Then I transfer. It runs clear until it gets to the end of the liquid then it starts pulling more trub gunk. That's when I stop the transfer.
When I clean the fermenting sanke keg out, it's full of nasty trub. I'd say a little less than 1/2 but more than a 1/4 of a gallon of gunk is still left--give or take depending on the beer.
What? If he ferments in a keg and then serves in that keg, he is NOT going to blow off all the trub. He's going to create a hole around the dip tube that will pull clean beer. All the hot break, debris, lees..etc will still sit in a big glob around the tube.
When I ferment in my sanke kegs, I transfer to a serving keg with a normal dip tube just like a corny keg. When I blow off the yeast, it runs clear... Then I transfer. It runs clear until it gets to the end of the liquid then it starts pulling more trub gunk. That's when I stop the transfer.
When I clean the fermenting sanke keg out, it's full of nasty trub. I'd say a little less than 1/2 but more than a 1/4 of a gallon of gunk is still left--give or take depending on the beer.
I didn't say "blow off" the trub. I said pull the trub from the bottom. My experience with trub in a keg has been, after I cold crash, the first pulls are mostly trub, and then clear beer after. Your last pulls might have trub too, but everything in between should be good clear beer. Again, I see no reason not to do this if you're fermenting less than 5 gallons and don't have other fermenters.
I didn't say "blow off" the trub. I said pull the trub from the bottom. My experience with trub in a keg has been, after I cold crash, the first pulls are mostly trub, and then clear beer after. Your last pulls might have trub too, but everything in between should be good clear beer. Again, I see no reason not to do this if you're fermenting less than 5 gallons and don't have other fermenters.
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