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Steel Pipe Formulas

Additional values pertaining to each steel pipe size can be calculated with the following formulas:  
d= Inside diameter of pipe
D= Outside diameter of pipe in inches
T= Thickness of pipe wall in inches
x= multiply
Weight of pipe in pounds per foot = 10.6802 x T x (D - T)
Outside surface area in square feet per foot = 0.2618 x D
Inside surface area in square feet per foot = 0.2618 x d
Inside area of pipe in square inches = 0.785 x d²
Total area of metal in square inches = 0.785 x (D² - d²)
Moment of inertia in inches4  = 0.0491 x (D4 - d4)

Radius of Gyration in inches = 0.25 x Square root of (D² + d²)
Section Modulus in inches3 = (0.0982 x (D4 - d4)) / D
Weight of water in a pipe in pounds = 0.3405 x d²

 

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