B
Browny
Hi Folks,
The board seems a little quiet so I better give everyone something to think about. I am a new AG Brewer and I've done 14 AG Brews to date. The first 1/2 dozen or so brews I worked out my system for lauter tun dead space, boil off, loss to trub etc and now have my volumes spot on. I know I need 30L + 1kg per kilo of grain to end up with 21L in the fermenter after a 60 min boil. 32L if it is 90min.
Now I come to preboil gravity and OG. In nearly all cases I hit my preboil gravity or exceed it but I never make my OG after boiling. You are probably thinking that I'm not getting the boil off I think I am, but if that were the case my volumes would be out and they are not. I'll give you an example of the latest brew I put down, a Sierra Navada Porter clone. The preboil gravity by Brewsmith is 1.040 and after a 90 min boil is 1.061. I achieved 1.046 on my preboil gravity and only 1.052 for the post boil. I am using a refractometer and allowing ample time for the wort to cool to 20C. Is there a logical explanation to this ?
cheers
Browny
The board seems a little quiet so I better give everyone something to think about. I am a new AG Brewer and I've done 14 AG Brews to date. The first 1/2 dozen or so brews I worked out my system for lauter tun dead space, boil off, loss to trub etc and now have my volumes spot on. I know I need 30L + 1kg per kilo of grain to end up with 21L in the fermenter after a 60 min boil. 32L if it is 90min.
Now I come to preboil gravity and OG. In nearly all cases I hit my preboil gravity or exceed it but I never make my OG after boiling. You are probably thinking that I'm not getting the boil off I think I am, but if that were the case my volumes would be out and they are not. I'll give you an example of the latest brew I put down, a Sierra Navada Porter clone. The preboil gravity by Brewsmith is 1.040 and after a 90 min boil is 1.061. I achieved 1.046 on my preboil gravity and only 1.052 for the post boil. I am using a refractometer and allowing ample time for the wort to cool to 20C. Is there a logical explanation to this ?
cheers
Browny