Calculate the weight of a steel pipe

What you need:

• Cylindrical formula for the volume
• specific weight of steel

Weight roughly equal to mass

• The physical term for a body's gravity is weight. Colloquially, this term is generally used, although it is not entirely correct. The weight changes with the position on earth. A body has a different weight at a pole than in Beijing and another in Hawai.
• In terms of the applicable standards, one would have to calculate the mass of the steel pipe. However, since the differences between the two units of measurement are only within narrow limits, the indication of weight can apply to most applications.

How a steel pipe is calculated

Since a steel pipe is circular, the calculation formula for the cylinder is used. Just imagine that the cavity in the pipe is also a cylinder that is inside the other. Therefore, you can calculate the two different cylinders individually and then subtract the small one from the large one.

1. The formula for the cylinder is: circular area times length, i.e. r² x 3.14 x length. Pay attention to the use of the same Dimensions, here cm. Assume the pipe is 5 cm in diameter, then r = 2.5 cm, R² therefore 6.25 cm², multiplied by pi gives 6.25 x 3.14 19.67 cm² (rounded).
2. Now multiply this circle content by the length of the pipe in cm. A standard steel pipe is 5 meters long, i.e. 500 cm. 19.67 cm² x 500 cm gives 9,835 cm³. This represents the volume of the large cylinder.


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3. Now calculate the volume of the cavity in the same way and subtract its volume from the first result. Set the specific weight of steel to 7.8 kg / dm³ a. The result for the full cylinder would be 7.8 kg x 9.83 dm³ = 76.67 kg (rounded).