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#1
02-22-2011, 06:24 AM
 Tom J Guest Posts: n/a
Pound per foot

I have a length of spiral metal duct pipe that I need to determine the pound per foot on.

The thickness of the metal is .035”.

The width of the metal coil used to make the pipe is 5.394”.

The diameter of the pipe is 44”.

The length of the pipe is 120”.

What is the formula that will give me the pound per foot?
#2
02-22-2011, 06:39 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,705 Rep Power: 17
Re: Pound per foot

Quote:
 Originally Posted by Tom J I have a length of spiral metal duct pipe that I need to determine the pound per foot on. The thickness of the metal is .035”. The width of the metal coil used to make the pipe is 5.394”. The diameter of the pipe is 44”. The length of the pipe is 120”. What is the formula that will give me the pound per foot?
Two questions:
*What is the density of the metal? Steel and aluminum will give quite different answers.
*Do the spiral turns overlap so the thickness of the pipe wall is more than 0.035" ? Describe the detail of overlap or the average pipe wall thickness.

In any case I would determine the total volume of the pipe wall
V = (pi)*L*t*(D - t/2)
where L = length, t = thickness, D = outside diameter, pi = 3.14159
(all dimensions must be in the same units, if all dimensions are inches, the volume is cubic inches). Multiply by the density of the metal in pounds per cubic inch.

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