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  #1  
Old 07-09-2008, 11:12 AM
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Question pipe conversion

I need to figure out how to convert a 20 foot piece of pipe with a 20 inch diameter so I can figure out how many yards of concrete it will take to fill it up. Can anyone help
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Old 07-09-2008, 05:22 PM
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Default Re: pipe conversion

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Originally Posted by Unregistered
I need to figure out how to convert a 20 foot piece of pipe with a 20 inch diameter so I can figure out how many yards of concrete it will take to fill it up. Can anyone help
Is 20" the inside diameter? 20" = 1.667'

Volume of pipe is (pi/4)*d*d*L = 0.785*1.667*1.667*20 = 43.63 ft³

There are 27 ft³/yd³, so 1.62 yd³
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Old 10-12-2009, 07:23 PM
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Default Re: pipe conversion

Hello,

I am wondering if you can help me with how many gallons of water would be in 600ft of 6" pipe. I know the formula for the volume of a cylinder is 3.14 x r squared x the height. But I'm not sure what to do because of the inches and feet.

Thanks
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Old 10-13-2009, 02:45 AM
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Default Re: pipe conversion

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Originally Posted by Unregistered View Post
Hello,

I am wondering if you can help me with how many gallons of water would be in 600ft of 6" pipe. I know the formula for the volume of a cylinder is 3.14 x r squared x the height. But I'm not sure what to do because of the inches and feet.

Thanks
You have to change either the feet or the inches; you can't do volume in mixed units. Since a gallon is defined as 231 cubic inches, I recommend changing the length,
600 ft x 12 in/ft = 7200 in, then
3.14*(3 in)²*7200 in * 1gallon/231 in³ = 881.3 gallons
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