Coldbreak Brewing HERMS Giveaway!

HomeBrewSupply AMCYL Brew Kettle Giveaway!


Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Extremely High Boil-Off %
Reply
 
Thread Tools
Old 01-17-2013, 04:29 PM   #1
SimonB
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jun 2012
Location: Cape Town, Western Cape , South Africa
Posts: 28
Likes Given: 1

Default Extremely High Boil-Off %

Hi all

I'm just setting up my new electric kettle BIAB setup and trying to test parameters before actually performing a brew.

It's a 28litre urn that I am using. My target bottling volumes are around 15litres.

I performed a 15litre test boil for 60 minutes. The boil off % was monumental 30.2% , with a vigorous boil (but not one that would cause risk of boil over).

This seems very high compared to a lot of what I have read which range from 4-15%, especially considering my urn is a pretty tall narrow one (30cm diameter)

I guess I have to do some serious topping up to reach my target volumes... or have I missed something?


SimonB is offline
 
Reply With Quote
Old 01-17-2013, 04:35 PM   #2
pabloj13
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2011
Location: Durham, NC
Posts: 1,553
Liked 91 Times on 79 Posts
Likes Given: 109

Default

That's 1.1 gallons/hr. That a pretty normal boiloff rate. The percentage doesn't really matter. I lose 1 gallon/hr in my setup whether I have 6 gallons or 8 gallons in the kettle.


__________________

Kegged Two Hearted, Dragonmead Final Absolution
Bottled Robust porter, Founder's Breakfast Stout, Ommegawd Hellepin, Ed Wort's Apfelwein
RIP Snake Dog IPA, Biermuncher's OktoberFAST, Falconer's Flight IPA, Two-Hearted clone (Culturing Bell's Yeast), Noberon wheat, Skeeter Pee using dry yeast, Smooth Oatmeal Stout


Simple and easy wort aeration - Harvest yeast from your blowoff - Homebrew Spicy Mustard
pabloj13 is offline
 
Reply With Quote
Old 01-17-2013, 04:51 PM   #3
SimonB
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jun 2012
Location: Cape Town, Western Cape , South Africa
Posts: 28
Likes Given: 1

Default

Thanks Pablo...

I just realized that the boil % was a pretty dumb measure to go by...

If I had started with 10 gallons and ended up with 8.9 it would have been 11%

So I guess that if 1.1 gallons an hour is pretty normal then I shouldn't be concerned...
SimonB is offline
 
Reply With Quote
Old 01-17-2013, 05:52 PM   #4
pabloj13
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2011
Location: Durham, NC
Posts: 1,553
Liked 91 Times on 79 Posts
Likes Given: 109

Default

Quote:
Originally Posted by SimonB View Post
Thanks Pablo...

I just realized that the boil % was a pretty dumb measure to go by...

If I had started with 10 gallons and ended up with 8.9 it would have been 11%

So I guess that if 1.1 gallons an hour is pretty normal then I shouldn't be concerned...
Yep, you can either account for it preboil, or just top off at the end. No worries.
__________________

Kegged Two Hearted, Dragonmead Final Absolution
Bottled Robust porter, Founder's Breakfast Stout, Ommegawd Hellepin, Ed Wort's Apfelwein
RIP Snake Dog IPA, Biermuncher's OktoberFAST, Falconer's Flight IPA, Two-Hearted clone (Culturing Bell's Yeast), Noberon wheat, Skeeter Pee using dry yeast, Smooth Oatmeal Stout


Simple and easy wort aeration - Harvest yeast from your blowoff - Homebrew Spicy Mustard
pabloj13 is offline
 
Reply With Quote
Old 01-17-2013, 07:33 PM   #5
SimonB
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jun 2012
Location: Cape Town, Western Cape , South Africa
Posts: 28
Likes Given: 1

Default

As a matter of my own interest, how would one scale one's boil off to other setups without experimentation.

I mean a 20 gallon setup isn't going to lose a gallon an hour (or would it if the urn was the same diameter as mine)?
SimonB is offline
 
Reply With Quote
Old 01-17-2013, 07:56 PM   #6
pabloj13
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2011
Location: Durham, NC
Posts: 1,553
Liked 91 Times on 79 Posts
Likes Given: 109

Default

Quote:
Originally Posted by SimonB View Post
As a matter of my own interest, how would one scale one's boil off to other setups without experimentation.

I mean a 20 gallon setup isn't going to lose a gallon an hour (or would it if the urn was the same diameter as mine)?
I'm not sure there's a really practical way to do that. There are so many variables: diameter of vessel, strength of boil, altitude/atmospheric pressure, humidity, etc. I think testing is the only way to get a real accurate picture.
__________________

Kegged Two Hearted, Dragonmead Final Absolution
Bottled Robust porter, Founder's Breakfast Stout, Ommegawd Hellepin, Ed Wort's Apfelwein
RIP Snake Dog IPA, Biermuncher's OktoberFAST, Falconer's Flight IPA, Two-Hearted clone (Culturing Bell's Yeast), Noberon wheat, Skeeter Pee using dry yeast, Smooth Oatmeal Stout


Simple and easy wort aeration - Harvest yeast from your blowoff - Homebrew Spicy Mustard
pabloj13 is offline
 
Reply With Quote
Old 01-18-2013, 02:22 AM   #7
acidrain
Feedback Score: 3 reviews
Recipes 
 
Join Date: Jul 2012
Location: Seattle, Washington
Posts: 1,912
Liked 162 Times on 140 Posts
Likes Given: 32

Default

Quote:
Originally Posted by pabloj13 View Post
I'm not sure there's a really practical way to do that. There are so many variables: diameter of vessel, strength of boil, altitude/atmospheric pressure, humidity, etc. I think testing is the only way to get a real accurate picture.
This^


Just for reference, I use a 15" keggle, and my boil off is 2 gallons per hr.
__________________
Keg #1: Brown Bomber Bourbon/Oak Vanilla Porter
Keg #2: The Bollocks ESB
Keg #3 Lawnmower APA
Fermenter: Empty
Bottled: Mjolnir Mead, Lazy Daze Hefe.
acidrain is offline
 
Reply With Quote
Old 01-18-2013, 06:43 PM   #8
KurtB
I may be drunk, but I'm not sure.
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Sep 2010
Location: South Elgin, IL
Posts: 742
Liked 40 Times on 34 Posts
Likes Given: 71

Default

In the amount of time it would take me to figure out the math involved to calculate the boiloff rate based on the shape of a vessel so that I could scale the calculation to a different system, I could put a few gallons of water into the pot and boil it for an hour. Somebody else that is a lot better in physics or engineering may be able to do it more quickly, but testing it would be the easiest way in my book to figure it out.

Boiloff is also not an exact science when it comes to brewing, especially outdoors. Simple things like wind, air humidity, rate of boil, etc. can affect boiloff as well even from batch to batch on the same system.
__________________
Beer is like porn. You can buy it, but it's more fun to make your own.
KurtB is offline
 
Reply With Quote
Old 01-18-2013, 07:35 PM   #9
sjwelna
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2008
Posts: 67
Liked 1 Times on 1 Posts

Default

My boiloff rate in my 10 gallon Sams club stock pot (~18" wide) is around 2 gallons an hour as well with a ~75k btu burner.

-Steve
sjwelna is offline
 
Reply With Quote
Old 01-18-2013, 07:42 PM   #10
mabrungard
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
mabrungard's Avatar
Recipes 
 
Join Date: Feb 2011
Location: Carmel, IN
Posts: 3,348
Liked 340 Times on 284 Posts
Likes Given: 30

Default

We just had a similar discussion on the AHA site, excepting that it also had to do with figuring how much minerals to add to the water.

If you do find that your system does boil off significantly more than the typical rate of around 1 gal/hr when dealing with 5 gal batches, then figure the mineral additions based on a volume of water needed when the boil off rate is at the typical rate. Then add plain water to the kettle to make up for that additional water that your system is going to boil off.

Low mineralized water like RO or distilled water would be ideal for that 'top-off' water, but it shouldn't matter too much unless your tap water is really highly mineralized.


__________________
Martin B
Carmel, IN
BJCP National
Foam Blowers of Indiana (FBI)

Brewing Water Information at:
https://sites.google.com/site/brunwater/

Like Bru'n Water on Facebook for occasional discussions on brewing water and Bru'n Water
https://www.facebook.com/pages/Brun-...?ref=bookmarks
mabrungard is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Extremely high OG reqding Meatyboy Beginners Beer Brewing Forum 8 06-03-2012 06:41 AM
extremely high og reading! Darklordenron General Beer Discussion 27 11-10-2011 12:39 AM
Extremely high efficiancy mlarnold All Grain & Partial Mash Brewing 8 04-21-2011 01:24 PM
Extremely high O.G. brutus37 Beginners Beer Brewing Forum 5 12-02-2009 05:15 PM
extremely high OG! BadKarmaa Beginners Beer Brewing Forum 15 01-14-2006 08:36 AM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS