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Brews & Views Bulletin Board Service * Brews and Views Archive 2004 * April 13, 2004 * Boil-off in 15.5 gallon keg? < Previous Next >

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Matt Walker (67.101.118.134)
Posted on Tuesday, March 30, 2004 - 08:01 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Anybody have a good estimation of boil-off volume for a 90 minute boil in a 15.5 gallon keg? I recently converted a keg to a kettle and am brewing a 10 gallon batch in it this weekend. For my five gallon batches in a 10 gallon kettle, I usually boil 7.5 gallons to end up with 5.5 gallons after chilling. What's a good pre-boil volume to end up with approx. 11 gallons going into the fermenters? I'm guessing 13 or 13.5 gallons...

Thanks!

-- Matt
 

robert rulmyr (63.156.128.9)
Posted on Tuesday, March 30, 2004 - 11:44 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

If you have the kettle on the same flame, the boil off should be about the same.
 

Mike Huss (24.123.94.154)
Posted on Tuesday, March 30, 2004 - 01:28 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Matt, after a recent discussion on Sanke boil off rates, I'd say start with what you have and adjust accordingly after you get some results. The reported boil off rates varied anywhere from 3/4 gal/hr to 2-1/2 gal/hr. Your mileage will DEFINITELY vary on this one.
 

Paul Edwards (199.46.199.232)
Posted on Tuesday, March 30, 2004 - 03:09 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Matt,

What mike said. A lot will depend on what kind of burner you have and how vigorous a boil you end up with.

That said, I boil over a 30,000 BTU/hr natural gas burner. I start with about 13 gallons and end up with around 11 gallons after a 60-75 minute boil time
 

Bill Pierce (24.141.129.137)
Posted on Tuesday, March 30, 2004 - 03:15 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Fill the kettle with about as much water as you would wort and boil it for 60 minutes. Measure the pre-boil and post-boil volumes (remember that water increases about 4 percent in volume from room temperature to boiling). Calculate your boiling losses accordingly. There will be some difference between water and wort and for each batch, but the calculations should be plenty close enough for homebrew.
 

Hophead (167.4.1.38)
Posted on Tuesday, March 30, 2004 - 03:35 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

As RR was saying, if the surface area of your 10 gallon kettle is the same as your sanke, and your 2 gallon loss was for a 90 minute boil, you should lose 2 gallons again. I think you're safe with 13.5 gallons, though you should also consider your false bottom differences, if any.

Better to end up with 11.5 gallons than 10.5 though, eh? (I threw that in for BP).
 

Vance Barnes (69.15.38.210)
Posted on Tuesday, March 30, 2004 - 04:49 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

I usually loose 1.25 gal/hr. boiling in a sanke. Close to 2 gal for a 90 min. boil.
 

Matt Walker (67.101.118.134)
Posted on Tuesday, March 30, 2004 - 10:14 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Thanks guys! Much appreciated. I'll likely start out with 13.5 gallons and see where I end up.

Cheers!

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