Evaporation in boiling wort

[mayday1019]

Hey Guys-

The recipes I typically get make 5 gals. Do you guys ever take evaporation and the liquid that is lost during the 1-1.5 hr boil time into consideration? Is this something that could effect the fg of the brew?

Thanks-

Bob

 

[user 574]

Yes we do consider evap and yes again, it'll affect final gravity. More boil-off the higher the gravity basically. With extract where you top off you get back to your desired volume. In the all grain full wort boils we try and address this so we get the desired volume in the end by calculating what we start with.

Your environment is going to affect your rate of loss to evaporation (temp, humidity, time & vigor of your boil I believe). With ProMash it calculates at 15% loss per hour. I'm probably close to that and use that as my guideline. I'm typically doing a 7g boil for 75 minutes and end with a bit over 5 after loss to kettle etc.

 

[Pumbaa]

A lot of the times with extract brews you do fall under the 5 gallon mark, in that case just top it off back up to 5 gallons with some water otherwise you will be over your SG.

With my all grains I normally am WAY over 5 gallons and end up with a longer boil to get it down to about the 5-6 gallon mark . . . depends how much crap that I have settle at the bottom of my kettle that determins who much I leave myself with.

 

[david_42]

If the final wort is under, I just add water to 5.5 gallons. This generally isn't a problem for AG batches, since I start with 6.5-7 gallons.

 

[todd_k]

Yes we do consider evap and yes again, it'll affect final gravity. More boil-off the higher the gravity basically. With extract where you top off you get back to your desired volume. In the all grain full wort boils we try and address this so we get the desired volume in the end by calculating what we start with.

Your environment is going to affect your rate of loss to evaporation (temp, humidity, time & vigor of your boil I believe). With ProMash it calculates at 15% loss per hour. I'm probably close to that and use that as my guideline. I'm typically doing a 7g boil for 75 minutes and end with a bit over 5 after loss to kettle etc.

This is completely off-topic but I wanted to comment on your avatar. I drive a VW Passat. I named him Hans Gruber when I got it last fall.

 

[Beer Snob]

Hey Guys-

The recipes I typically get make 5 gals. Do you guys ever take evaporation and the liquid that is lost during the 1-1.5 hr boil time into consideration? Is this something that could effect the fg of the brew?

Thanks-

Bob

Bob, David_42 mentioned in the end to have 5.5 gal. The reason he and many do this is because after you ferment the beer and rack it to the secondary some is going to be lost. Trub... hops.... junk sitting on the bottom you dont want. When you have 5.5 gal in the primary and rack you'll end up with the 5 Gal you need come bottling time.

 

[TomInMaine]

This is completely off-topic but I wanted to comment on your avatar. I drive a VW Passat. I named him Hans Gruber when I got it last fall.

Hans Gruber didn't he fall to his Death from a nice I room in Nakutomi towers.