Info Needed.....
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Info Needed.....

  1. #1
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    Default 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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  3. #2
    gn7
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    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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    Last edited by gn7; 08-13-2011 at 05:42 PM.

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    Default Gallons?

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


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    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.
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    Default 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

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    Senior Member Mash on It's Avatar
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    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. #7
    Senior Member Mash on It's Avatar
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    Quote Originally Posted by nelson#109 View Post
    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
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    Default 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
    Last edited by Moneypit; 08-13-2011 at 10:50 PM.
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    Senior Member Mash on It's Avatar
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    Quote Originally Posted by Moneypit View Post
    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
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  12. #10
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    Default Not disputing the math

    Quote Originally Posted by Mash on It View Post
    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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