 Info Needed.....

# Thread: Info Needed.....

1. ## 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 2.

3. ## 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.

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4. ## Gallons?

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

5.

6. ## 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. 7. ## 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 8. ## 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

9. ##  Originally Posted by nelson#109 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 8' dia x 8' h
48" x 48" x 3.14285 x 96" / 231 = 3009.2992 gals

96" x 3.14 / 4 75.36"......75.36 x 75.36 x 96 / 231 = 2360.1577 gals or
22% short, just sayin

Daniel
Mash on it

10. ## 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....
Ray

11. ##  Originally Posted by Moneypit 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???......
Ray
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

12. ## Not disputing the math Originally Posted by Mash on It 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
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....
Ray

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