CHE4284_5292_Problems_20130522_Solution

# Industrial safety summer 2013 problems mepdef

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Industrial Safety Summer 2013 Problems MEPdeF - 05/22/2013 Problem 1 : There are six process units in a chemical plant. The FARs for the units are given as follows: Process Unit 1 2 3 4 5 6 FAR .01 .05 .15 .30 .65 .85 Calculate: 1.1 The overall FAR for the plant. 1.2 If a worker A spends 10% of the time in Unit 2, 15% in Unit 3, 30% in Unit 5, and the rest in Unit 1. What is the overall FAR in this case? In worker B spends 10% of the time in Unit 1, 35% in Unit 3, 10% in Unit 5, and the rest in Unit 4. What is the overall FAR in this case? Which worker is at most risk? Why? 1.3 If there are 1000 workers in the plant, calculate the fatality rate for the whole plant. 1.4 Calculate the fatality rate for worker B, assuming that 45% of the total workers follow this shift. 1.5 If in Unit 5 the number of lost workdays has been 2 in the past 120 days and the total workers in this Unit are 250, find the OSHA Incidence Rate based on lost workdays. Solution: 1.1 The overall FAR for the plant. Plant FAR = 01 . 2 85 . 0 65 . 0 30 . 0 15 . 0 05 . 0 01 . 0 ) FAR ( 6 1 i = + + + + + = 1.2 If a worker A spends 10% of the time in Unit 2, 15% in Unit 3, 30% in Unit 5, and the rest in Unit 1. What is the overall FAR in this case? In worker B spends 10% of the time in Unit 1, 35% in Unit 3, 10% in Unit 5, and the rest in Unit 4. What is the overall FAR in this case? Which worker is at most risk? Why?

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