calculate water volume in a pipe

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calculate water volume in a pipe

Postby Ross » Tue Oct 18, 2005 3:37 am

If I have a pipe which is 4" in diamter and the pipe is 30' in length,
what is the water volume in gallons inside the pipe?
Ross Edwards
Ross
 
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Location: California

Postby Guest » Tue Oct 18, 2005 4:54 am

About 19.6 gallons

30' = 360 inches

V = (pi/4)*d*d*h
where d is INSIDE diameter of the pipe, and h the length
This will be in cu inches (the reason for converting the length.

Then 1 US gallon = 231 cu in.
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Thankyou

Postby Ross » Thu Oct 20, 2005 11:41 pm

Anonymous wrote:About 19.6 gallons

30' = 360 inches

V = (pi/4)*d*d*h
where d is INSIDE diameter of the pipe, and h the length
This will be in cu inches (the reason for converting the length.

Then 1 US gallon = 231 cu in.


I should read this as pi divided by 4 X d X d X height
which two diamters do you refer too?
Ross Edwards
Ross
 
Posts: 3
Joined: Tue Oct 18, 2005 3:32 am
Location: California

Postby Guest » Fri Oct 21, 2005 3:27 am

The diameter needs to be squared. I didn't have a good way to do a superscript (or I was too lazy to fire up Character Map).

I had the same problem with how to express pi = 3.14159..., but you need the constant pi/4.

Maybe V = 0.785*h*d^2 is clearer.
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