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© Infrastructure Health & Safety Association (IHSA) 43 • Institute for Work & Health (IWH) Example 3: Calculate the weight of the steel pipe in kg. The diameter is 3' 6". The length is 12' 4". The wall thickness is 7/8". Step 1: Complete the calculation Calculate the surface area of the pipe. The pipe is a rolled up rectangle with the same length. The width is equal to the circumference (π × d). Convert inches to decimals of a foot. 3' 6" = 3.5' 12' 4" = 12.333' Area = π × d × L = 3.14 × 3.5' × 12.333' = 135.53967 ft² Note: 3.14 was used for π. If you use 3.14159 or the π button on the calculator, you will get a slightly different answer. Step 2: Locate the unit weight in Table 1.3 Weights of Materials (Based on Surface Area). Steel plate (per inch of thickness) = 40 lbs/ft²

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