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  #1  
Old 07-18-2006, 12:33 PM
Mistopheles52
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Talking gallons in 1/2 inch pipe

Hi All:

I'm math challenged...always was and always will be. What I am trying to do is figure out how many gallons of water there would be in a 1/2 pipe, pipe being 800 feet long. Can someone help? Thanks
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  #2  
Old 07-18-2006, 08:21 PM
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Default Re: gallons in 1/2 inch pipe

The 1/2 pipe is what? 1/2 inch diameter?

A pipe that is 1/2 inch in diameter and 800 feet long will hold about 8.16 U.S. gallons.

In case you were wondering how I calculated it... (I know nobody was wondering that, but its very fun to do)

First you need to calculate the cross sectional area of the pipe.

area = Pi * radius≤

Pi * (0.5 / 2)≤ = 0.19625 square inches

Now we just multiply that area, by the length of the pipe, though first we need to convert to the same base unit, such as inches.

800 feet * 12 = 9600 inches
9600 inches * 0.19625 square inches = 1884 cubic inches

Now we can use the volume conversion page to convert cubic inches to gallons.

1884 cubic inch = 8.15584415584416 gallon [US, liquid]

(You can also use the cylinder volume calculator to do this if you wish)
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  #3  
Old 07-19-2006, 05:03 AM
Mistopheles52
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Default Re: gallons in 1/2 inch pipe

Hi Robert:

Thank you for figuring that out for me. Yes...the pipe is 1/2 inch across in diameter...it is pvc pipe....so 1/2 inch of water would flow thru 800 feet of water.
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  #4  
Old 10-17-2009, 07:34 AM
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Default Re: gallons in 1/2 inch pipe

I am trying to figure out how many gallons I require to run through a 1/2 inch pipe which is 1524 feet long.
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  #5  
Old 10-17-2009, 03:07 PM
JohnS JohnS is offline
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Default Re: gallons in 1/2 inch pipe

Quote:
Originally Posted by Mistopheles52 View Post
Hi All:

I'm math challenged...always was and always will be. What I am trying to do is figure out how many gallons of water there would be in a 1/2 pipe, pipe being 800 feet long. Can someone help? Thanks
Convert the length to inches, 800' x 12 in/ft = 9600 in
Volume is (pi/4)*d≤*h = .785* (0.5 in)≤* 9600 in = 1885 in≥.

1 gallon = 231 in≥, so 8.16 gallons.

This assumes ID really is 1/2 inch. Modern pipe actual has the same OD and larger than nominal ID.
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  #6  
Old 05-14-2011, 06:14 AM
twank
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Default Re: gallons in 1/2 inch pipe

how many gallons of water are in an a 8in pipeline 2,200 ft long ?
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  #7  
Old 05-29-2011, 05:19 AM
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Angry Re: gallons in 3 inch pipe

Need pipe volume in gallons please

3" ID pipe that is 25 feet long.

How many gallons does this represent?

----------------------------------------

Need amall basin in gallons please

24"x24"x8"

thank you
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  #8  
Old 05-29-2011, 08:35 AM
JohnS JohnS is offline
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Default Re: gallons in 3 inch pipe

Quote:
Originally Posted by Unregistered View Post
Need pipe volume in gallons please

3" ID pipe that is 25 feet long.

How many gallons does this represent?

----------------------------------------

Need amall basin in gallons please

24"x24"x8"

thank you
25 ft = 300 in
(pi/4)*3*3*300 = 2120.6 in≥
At 231 in≥/gal, 9.18 gallons

2nd problem, assuming rectangular, 4608 in≥ or 20 gallons roughly
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  #9  
Old 06-04-2011, 12:03 PM
Bompata
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Default Re: gallons in 1/2 inch pipe

JohnS summarizes well the math needed to calculate the volume of a pipe. There is only one problem. A 1/2 inch pipe does not have an internal diameter of 1/2 inch! In fact, there is nothing about a 1/2 inch pipe that is 1/2 inch! The internal diameter of a 1/2 inch steel pipe is actually closer to 5/8 inch!

How can this be? For those who are interested, there is an excellent historical summary entitled "Notes on Pipe" at the gizmology website. Forum rules won't allow me to include the link in my message but you can probably find it using a web browser.
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  #10  
Old 06-04-2011, 12:38 PM
HerrWarum
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Default Re: gallons in 1/2 inch pipe

'Nominal' vs. 'actual' measurements hold a lot of surprises. And, a 2x4 isn't.

Half the time the nominal measurement should be in favor of the consumer, half the time, not. Otherwise there is statistical evidence of false statements or lies.

Last edited by HerrWarum; 06-04-2011 at 12:47 PM.
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