Post boil gravity issues (Beersmith)

[mwm5461]

Hello all,

Not too long ago I purchased the Brau Supply EBIAB system. I have been really happy with the purchase and have really been improving on my brewing process. One issue I can't seem to fix though is my post boil gravity. My last two brews I have hit my SG dead-on but my post-boil gravity has been off. I included two screenshots of my past brews so people can see examples of this alongside the volume readings.

Are beersmith estimates off or am I messing something up? How do I adjust for this? When I use the calculator here at Brewer's Friend http://www.brewersfriend.com/dilution-and-boiloff-gravity-calculator/ I get much different numbers (I also included a screenshot of an example of the calculations I got from one of the past two brews). I appreciate any advice anyone can provide.

Let me know if you need any other details and thank you for any help you can provide!

 

[schatzke]

SG and post boil are the same thing in my book. Are you saying your gravity is off before or after the boil or both?

 

[porterpounder]

Pre-boil and post-boil gravity measurements depend of the length and vigor of your boil. If you're not hitting your OG(SG, whatever) post-boil then you either have your boil-off rate set too low in the system, you are not boiling hard enough, or you are not mixing up your wort prior to sampling after cooling which means you're measuring stratified lower-gravity wort.

 

[kh54s10]

SG = specific gravity This is any gravity measurement. OG = original gravity This is the gravity after the boil. I think you are referring to preboil gravity. Are you getting the proper volume when finished with the boil? If not your OG will not be correct. If you get too much wort the OG will be low. If you don't get enough, it will be high.

I find that the Preboil to OG is right on if you get the proper volume.

The Brewers friend is telling you that you need to boil 6.76 gallons of 1.058 wort down to 5.77 gallons to get 1.068

If I read what you are saying in the first screenshot. You got a preboil gravity of 1.058, boiled the 6.76 gallons to 5.5 gallons and ended up with 1.066 but the estimate was 1.068.

If that is accurate you are doing quite well. The estimate of 1.068 is just that.. An estimate.

If your volume measurements are off, even a little, a .002 variance is expected.