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Essential Skills and OHS Training

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© Infrastructure Health & Safety Association (IHSA) 40 • Institute for Work & Health (IWH) Example 4 Calculate the weight of the steel plate. Step 1: Complete the calculation Volume of a rectangle. Note: Weight of materials in tables are usually stated in lbs/ft³ or kg/m³. The steps for calcuating weight are the same for metric and imperial dimensions. The unit weight factor is different. Convert inches to decimal feet. Note: to convert inches to decimal feet, do inches ÷ 12. 4' 6" = 4.5' 1" = 0.083' 11' 6" = 11.5' V = L × W × H = 11.5' × 4.5' × 0.083' = 4.29525 ft³ Step 2: Locate the unit weight in the Table 1.2. Steel = 490 lbs/ft³ Step 3: Calculate the weight. Weight = Volume × unit weight = 4.29525 ft³ × 490 lbs/ft³ = 2 105 lbs

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