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If the outside diameter and the wall thickness of a steel pipe is known, the weight per foot can be expressed as:
m = 10.68 (do - tw) tw (1)
where
m = weight per foot (lbs/ft)
do = outside diameter (inches)
tw = wall thickness (inches)
The outside diameter (do) of 4" Schedule 40 Steel Pipe is 4.500 inches. The wall thickness is 0.237 inches. The weight per foot can be calculated using (1) as:
m = 10.68 (4.500 - 0.237) 0.237
= 10.79 lbs/ft
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