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© Infrastructure Health & Safety Association (IHSA) 42 • Institute for Work & Health (IWH) Example 2: Calculate the weight in kilograms of a steel plate with the following dimensions. Step 1: Calculate the area. Convert feet and inches to decimal feet Note: To convert feet and inches to decimal feet, do inches ÷ 12. 5" ÷ 12 = 0.417' 3' 5" = 3.417' Area = πr2 = 3.14 × 3.417' × 3.417' = 36.66229146 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/ft 2 Step 3: Calculate the weight. Convert fraction of an inch to decimal inches. Note: To convert a fraction to decimal inches, always do top ÷ bottom. ⅝" = 5 ÷ 8 = 0.625" Weight = area × thickness in inches × 40 lbs/ft 2 = 36.68088711 ft2 × 0.625" × 40 lbs/ft 2 = 917.0221777 lbs Step 4: Convert lbs to kilograms. 1 kg = 2.2 lbs Note: To convert pounds to kilograms, divide by 2.2. To convert kilograms to pounds, multiply by 2.2. 917.0221777 lbs ÷ 2.2 lbs/kg = 417 kg

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