How to calculate the weight of steel pipe

　　kg/m is kilograms per meter

　　lb/ft is pounds per foot

　　P1= t(D-t)*C

　　Where

　　D is the specified outside diameter, expressed in millimeters (inches)

　　t is the specified wall thickness, expressed in millimeters (inches)

　　C is 0.02466 for calculations in SI units and 10.69 for calculations in USC units.

　　Please note: The steel pipe nominal weight is that the product of its length and its mass per unit length (Per foot or per meter)

　　For example: The description of API 5L Gr. B Seamless Steel Line Pipe, Outer Diameter is 6 5/8 inch (168.3 mm), Pipe Wall Thickness is SCH 40 (7.11 mm or 0.280 inch), length 12 meters.

　　Then the unit pipe weight kg/m, 7.11 x (168.3-7.11) x 0.02466 = 28.26 kg/m

　　Unit steel pipe weight lb per foot is 0.28 x (6-0.28) x 10.69 = 18.99 lb/ft