How to figure out... - Home Brew Forums
Home Brew Forums > Home Brewing Beer > General Beer Discussion > How to figure out...

Reply
 
Thread Tools
Old 10-21-2009, 08:44 PM   #1
Xiren
Recipes 
 
Jun 2007
Mishawaka, Indiana
Posts: 115
Liked 1 Times on 1 Posts



I was listening to a podcast, where someone was able to use a yardstick and multiply the result by some number to get the gallons of wort in his kettle. Since the kettle dimension are different for everyones kettle, does anyone know how to figure this out?
Thanks in advance.


__________________
Fairy tales do not tell children that dragons exist.
Children already know that dragons exist.
Fairy tales tell children that dragons can be killed.

 
Reply With Quote
Old 10-21-2009, 08:52 PM   #2
jcarson83
 
jcarson83's Avatar
Recipes 
 
Jun 2006
Springfield, MO
Posts: 928
Liked 15 Times on 10 Posts


1 gal = .13 cubic feet. So pie r square times decimal feet for the depth. Or you could just pour in a gallon and mark it and repeat.



 
Reply With Quote
Old 10-21-2009, 08:53 PM   #3
weirdboy
HBT_LIFETIMESUPPORTER.png
Recipes 
 
May 2009
Los Angeles
Posts: 8,162
Liked 481 Times on 389 Posts


What I do is mark my yardstick with gallon and half-gallon lines on the back.

I used math to figure out how many inches per gallon, and worked from there.

The volume of a cynlinder is the height times Pi * R^2, where R is the radius.
The only thing I had to look up was the conversion from cubic inches to gallons.

 
Reply With Quote
Old 10-21-2009, 08:53 PM   #4
DRoyLenz
Recipes 
 
Jun 2009
Chicago
Posts: 702
Liked 4 Times on 3 Posts


This is kind of a cool idea, I think I might run these calculations and try this.

 
Reply With Quote
Old 10-21-2009, 08:55 PM   #5
Walker
I use secondaries. :p
HBT_LIFETIMESUPPORTER.png
 
Walker's Avatar
Recipes 
 
Sep 2005
Cary, NC
Posts: 10,987
Liked 101 Times on 89 Posts


If you consider your kettle to be a simple cylinder, the volume of the liquid in the kettle would be:
<b>

</b>where "r" is the inside radius of the kettle and h is the height of the liquid in it.

If you use a yardstick, this will give you a volume in cubic inches, which you can convert to gallons with the rule:

1 gallon = 231 cubic inches

I took the cheater method and filled my kettle with a 4 gallons of water, stuck my Big Spoon in it, and marked the waver level on the spoon.

Added another 1 gallon of water and made another mark.

Repeat until you have a spoon that can serve as a dip-stick and tell you how much is in the kettle.
__________________
Ground Fault Brewing Co.

 
Reply With Quote
Old 10-21-2009, 08:57 PM   #6
uwjester
HBT_LIFETIMESUPPORTER.png
 
uwjester's Avatar
Recipes 
 
Sep 2007
Fort Collins, CO
Posts: 688
Liked 5 Times on 5 Posts


If you know you have a 10 gallon kettle, divide the height by 10 to find how many gallons per inch/centimeter. That way, you can measure from the top and still know. I'm all for the calculations, but this may be an easier way. My 15 gallon kettle is 15" tall, so I just know that each inch is 1 gallon.

Edit: I had the numbers backwards. They should be right now.
__________________
--------------------------------------------------
This space intentionally left blank.
--------------------------------------------------


 
Reply With Quote
Old 10-22-2009, 01:18 AM   #7
shortyjacobs
Recipes 
 
Aug 2009
Twin Cities, MN
Posts: 2,509
Liked 33 Times on 33 Posts


My keggle has a curved bottom. I poured in gallons of water to find out how many inches per gallon. It came out to:

2.25 inches for the first gallon
1.38 inches for every gallon thereafter....

Therefore, 6 gallons would be 2.25+1.38*5 inches.

 
Reply With Quote
Old 10-22-2009, 03:38 AM   #8
Scut_Monkey
Recipes 
 
Jan 2009
Pittsburgh, Pennsylvania
Posts: 2,656
Liked 14 Times on 14 Posts


Yeah I do the old marked stick for my measurements. I try to limit as much math as possible during my brewday to allow for more fun (ie beer).

 
Reply With Quote
Old 10-22-2009, 12:31 PM   #9
Homercidal
Licensed Sensual Massage Therapist.
HBT_MODERATOR.png
 
Homercidal's Avatar
Recipes 
 
Feb 2008
Reed City, MI
Posts: 30,320
Liked 4665 Times on 3142 Posts


I've been meaning to do this for a while now. Somehow it never seems to get done.
__________________
What year is this?
It's the Viking age.
That explains the Laser Raptors! F***! I went back in time too far! - Kung Fury

 
Reply With Quote
Old 10-22-2009, 01:40 PM   #10
springer
 
springer's Avatar
Recipes 
 
Feb 2008
Wappingers falls NY
Posts: 4,743
Liked 24 Times on 22 Posts


can't do this with a Coors keg its not a straight cylinder I had to use the old add a gallon to the HLT and mark the site glass . The keggle was easy its pretty much linear .


__________________
'The taxpayer: That's someone who works for the federal government but doesn't have to take the civil service examination.'- Ronald Reagan

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Can't figure it out?? DemonCleaner All Grain & Partial Mash Brewing 7 06-10-2009 10:53 PM
Can't figure this out. burnninator Beginners Beer Brewing Forum 16 12-03-2008 05:43 AM
Can't figure it out Bad Shark Brew General Beer Discussion 3 04-09-2008 09:16 PM
Can you figure ABV by OG? mayday1019 Beginners Beer Brewing Forum 2 10-16-2007 01:09 AM


Forum Jump