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#1
09-08-2007, 02:56 AM
 Unregistered Guest Posts: n/a
Gallons in cylinder

I can not seem to find the formula for gallons in an upright cylinder.
We have a 30' diameter tank with 20" of diesel fuel in it, needing to know how many gallons we actually have?
Thanks
#2
09-08-2007, 11:22 AM
 RPage6943 Guest Posts: n/a
Re: Gallons in cylinder

You can compute the volume of a cylinder by just multiplying the area of bottom of the cylinder by it's height.
The area of the bottom would be pi times the radius squared. The radius is half the diameter.
The height is just the height of fluid in your case, 20 inches or 1.67 feet.
Be sure you use the same units for all the distance measurements.

That would be:

(15)*(15)*(3.14)*(1.67) = 1180 cubic feet of fuel

there are 7.48 gallons per cubic foot so there are 1180*7.48 = 8829 gallons in the tank if I didn't slip a digit somewhere.

You can find the conversion from cubic feet to gallons on the home page, I can't give a link in this post.
#3
09-28-2007, 10:09 AM
 Unregistered Guest Posts: n/a
Re: Gallons in cylinder

Quote:
 Originally Posted by Unregistered I can not seem to find the formula for gallons in an upright cylinder. We have a 30' diameter tank with 20" of diesel fuel in it, needing to know how many gallons we actually have? Thanks
v=3.14159 x r2 x h hope this helps
#4
12-09-2008, 03:23 PM
 beneniah Guest Posts: n/a
Re: Gallons in cylinder

What if it is a horizontal cylinder, how do you calculate the gallons of liquid in it?
#5
03-11-2010, 02:37 AM
 Daniel Guest Posts: n/a
Re: Gallons in cylinder

I am trying to figure out how big I need to make stainless steel vat. I know that the diameter of it needs to be 26" , and I need to make two different sizes. One that holds 100 gallons and one that holds 150 gallons. I never did learn to use the Pi method , although I've been trying to figure it out. It seems to be over my head. Can anybody help ??

Daniel
#6
03-11-2010, 06:33 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: Gallons in cylinder

Quote:
 Originally Posted by Daniel I am trying to figure out how big I need to make stainless steel vat. I know that the diameter of it needs to be 26" , and I need to make two different sizes. One that holds 100 gallons and one that holds 150 gallons. I never did learn to use the Pi method , although I've been trying to figure it out. It seems to be over my head. Can anybody help ?? Daniel
If you are measuring in inches, you need your volumes in cubic inches.
1 (US) gallon = 231 in³, so you need 23100 in³ and 34650 in³. A tank or vat should always allow for thermal expansion of the liquid. It should be at least 10% larger than the maximum volume you wish to actually hold. I don't know if you have already allowed for this. If not, increase the heights below by 10%.

Volume of a cylinder is V = (pi/4)*D*D*h,
We can solve for h = 4*V/(pi*D*D)
h1 = 4 x 23100 in³/(3.14159*26"*26") = 43.5 "

The height for the 2nd tank is 65.26"

This is for exactly the volume specified, increase by at least 10% (47.9" and 71.8") if you actually wish to hold 100 and 150 gallons. Remember that the 26" must be the inside dimension, not the external diameter.
#7
11-18-2010, 04:43 PM
 Unregistered Guest Posts: n/a
Re: Gallons in cylinder

I have a tank that is 4' wide and 7'high how many gallons will it hold?
#8
04-22-2013, 12:39 PM
 Unregistered Guest Posts: n/a
Re: Gallons in cylinder

#9
12-21-2013, 10:45 PM
 Unregistered Guest Posts: n/a
meq/g to meq/liter

Hi I need to convert above please can you help in.

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