Gallon markings for 7 gallon plastic primary fermenter - Page 2 - Home Brew Forums

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10-29-2009, 12:43 AM   #11
Lupy
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Mar 2009
East of the Willamette.
Posts: 31

IT MAY BE WRONG but I think I have read that the lowest ring from the top of the bucket often marks the size of the bucket as marketed.
Not sure it really matters since you hit your OG, just measure next time.

10-29-2009, 12:54 AM   #12
eljefe

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Jan 2008
Pittsburgh
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Not to be too geeky, but the volume of the container should be (Pi)R^2*H. I am assuming the walls of the fermenter are somewhat straight.

If you use inches for the dimension you can divide by 250 to get the number of gallons. This is an estimate.

You can also back into the heighth dimension to give you .5 gallon increments.
Height=((# of gallons)*250)/(Pi)*r^2

So a 12.5 width pot 11 inches deep is slightly more than 5 gallons.
The # of inches for 1 gallon would be (250)/(3.14*6.25^2)

Again this is an estimate but should be close.
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10-29-2009, 02:00 AM   #13
capn

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Feb 2008
SW CT
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Quote:
 Originally Posted by eljefe Not to be too geeky, but the volume of the container should be (Pi)R^2*H. I am assuming the walls of the fermenter are somewhat straight. If you use inches for the dimension you can divide by 250 to get the number of gallons. This is an estimate. You can also back into the heighth dimension to give you .5 gallon increments. Height=((# of gallons)*250)/(Pi)*r^2 So a 12.5 width pot 11 inches deep is slightly more than 5 gallons. The # of inches for 1 gallon would be (250)/(3.14*6.25^2) Again this is an estimate but should be close.
nice job droping the math formula bomb there. my highschool math (and for that matter chemistry and biology) teachers would be proud.
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03-15-2014, 07:16 PM   #14
Owly055
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Mar 2014
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Quote:
 Originally Posted by eljefe Not to be too geeky, but the volume of the container should be (Pi)R^2*H. I am assuming the walls of the fermenter are somewhat straight. If you use inches for the dimension you can divide by 250 to get the number of gallons. This is an estimate. You can also back into the heighth dimension to give you .5 gallon increments. Height=((# of gallons)*250)/(Pi)*r^2 So a 12.5 width pot 11 inches deep is slightly more than 5 gallons. The # of inches for 1 gallon would be (250)/(3.14*6.25^2) Again this is an estimate but should be close.
There are 231 cubic inches per gallon................ not 250.

H.W.