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Calculating Pipe Weight

A weight calculating formula for steel pipes

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Pipe - weight

Weight per unit length of pipe can be calculated as

W = ρ A                            (1)


W = weight (kg/m, lb/ft)

ρ =  density (kg/m3, lb/ft3)

A = cross sectional area (m2, ft2)

The cross sectional area can be expressed as

A = π (D / 2)2 - π ((D - t) / 2)2    

   = π t (2 D - t) / 2                 (2)


D = outside diameter (m, ft)

t = wall thickness (m, ft)

Eq. (1) and (2) - can be combined and modifying for commonly used units mm and inches.

Weight of Pipe - SI Units

W = 10-6 ρkg/m3 π tmm (2 Dmm - tmm) / 2                    (3)


W = weight per meter (kg/m)

ρkg/m3 = density (kg/m3)

Dmm = diameter (mm)

tmm = thickness (mm)

Weight of Pipe - SI Units Calculator 

D - outside diameter (mm)

t - wall thickness (mm)

ρ - density (kg/m3)

Weight of Pipe - Imperial Units

W = ρlb/ft3 π tin (2 Din - tin) / 288                    (4)


W = weight per ft (lb/ft)

ρlb/ft3 = density (lb/ft3)

Din = diameter (in)

tin = thickness (in)

Weight of Pipe - Imperial Units Calculator 

D - outside diameter (in)

t - wall thickness (in)

ρ - density (lb/ft3)

Example - Weight of 4" Schedule 40 Steel Pipe

The outside diameter  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 (4) as:

m = (490 lb/ft3) π (0.237 in)(2 (4.500 in) - (0.237 in)) / 288   

   = 11.1 (lb/ft)

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