I need a web site to figure the capacity of a cylinder in order to build a gas tank for a project i'm working on...TIA

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- 08-13-2011, 05:20 PM #1
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## Info Needed.....

I need a web site to figure the capacity of a cylinder in order to build a gas tank for a project i'm working on...TIA

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- 08-13-2011, 05:37 PM #2
Round cylindrical tank?

diameter X diameter X .7854 X length

If you do it in feet, the answer is cubic feet. One cubic foot = 7.48 gallons.

I would link you with a site, but seriously, you need to do the math.**100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3**Last edited by gn7; 08-13-2011 at 05:42 PM.

- 08-13-2011, 06:33 PM #3
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## Gallons?

You might want to move the decimal point on the gallons...??

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- 08-13-2011, 07:15 PM #4
Here's your formula:

The area of a circle is PI (3.1416) X Radius-squared

Square the radius in inches. The radius is 1/2 of the tank's diameter or width. Multiply it by itself.

Now multiply that number by PI (3.1416) to determine the area in square inches.

Now, multiply this area of the circle by the length (in inches) of the tank

1 cubic foot = 1728 cubic inches so divide your total square inches by 1728 to determine your total square feet

1 cubic foot = 7.48051948 US gallons so multiply your total cubic feet by 7.48051948 to get the capacity of your tank in gallons.

If the tank has rounded ends, it gets much more complicated.

Personally, I fill the tank with liquid than pour it back into a gas can with measuring marks.The best things in life aren't things! - 08-13-2011, 07:40 PM #5
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## round ends

why not just take the diameter and multiply by 3.14 and make the round flat. then divide that number by 4 and make it square. that will make it easier to figure out. or just call a nerd like i do and have them figure it out

- 08-13-2011, 09:47 PM #6
Here is a real easy way

radius (Inches) x radius (inches) x pi (3.14285) x Depth/height (inches)

__________________________________________________ _________

231

or

r x r x Pi x d / 231= gallons - 08-13-2011, 10:08 PM #7
- 08-13-2011, 10:46 PM #8
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## 1 so ft = 7 gallons?

I'm trying to visualize a 12"X12"X12" (1 cubic ft) container holding 7 gallons??? When that container is made round, how can it hold 7 gallons??..... I see the math, but I also see what a 5 1/2 gallon jug looks like??? Looks much larger than a cubic ft, yet holds less....?? I could see 3/4 gallon, like .748, but, really 7 gallons???......I guess I'll have to build a sq foot and prove it to myself....

RayLast edited by Moneypit; 08-13-2011 at 10:50 PM.

LOUD BOATS SAVE LIVES - 08-13-2011, 11:13 PM #9
12 x 12 x 12 = 1728 / 231 = 7.48 gals

Jerry can appx 6 x 12.5 x 16 = 1200 / 231 = 5.19 gals

8" dia x 1" = 0.2176 gals per inch, so a 8 x 32 is appx 7 gals

12" dia. x 1" = 0.4897 gals per inch, so a 12 x 14.25" long tank = 7 gals ( fuel, plan on 90%, or 6.3 gals)

Daniel

mash on it - 08-14-2011, 12:18 AM #10
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## Not disputing the math

Oh I see it, I'm not disputing the math, just looking at this 5 1/2 gal jug and trying to figure where it is losing volume... The old "safety" cans with the spring loaded handle/cap, they were about 12-14" in diameter, and at least 14" tall, maybe 18" even, and they just held 5 gal.... I see the math, and math doesn't lie, no dispute there. It's just the practical application, the visual, that is misleading...Kinda like pouring measured amounts of water into a pan to figure how much will fit under the tray....

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