This is process safety management Course

Chapter 2 ( Toxicology )

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04) (25 pts 20 % of workers are expected to die in case they are exposed to 500 ppm of carbon monoxide (CO) for a period "t" and then are exposed to 700 ppm of CO for a period 3t". a) Calculate the total time of exposure to CO (in hours) in that case? (20 pts/ b) By using the results obtained in part a), what is the minimum concentration of CO that would result in 0% death of workers? 15 pts] Type of injury or damage Causative variable Probit parameters k; k; Fire -149 2.56 Bwn deaths from flash fire Bwn deaths from pool burning 11/10 13/10 -14.9 2.56 Explosion pe -77.1 6.91 J Deaths from lung hemorrhage Eardrun ruptures Deatles from impact Injuries from impact Injuries from flying fragments Structural damage Glass breakage -15.6 -46.1 -39.1 -27.1 -23.8 1.93 4.82 4.45 J J 4.26 2.92 pe -18.1 2.79 Toxic release -35.9 -37.98 1.85 3.7 -8.29 -6.19 -16.85 0.92 10 2.0 Ammonia deaths Carbon monoxide deaths Chlorine deaths Ethylene oxide deaths Hydrogen chloride deaths Nitrogen dioxide deaths Phosgene deaths Propylene oxide deaths Sulfur dioxide deaths Toluene deaths ECOT C ECOT C0T CT C0T C CT ECOT C51 1.4 -13.79 -19.27 3.69 -7.42 0.51 - 15.67 -6.79 1.0 0.41 effective time duration (s) effective radiation intensity (W/m) time duration of pool burning radiation intensity from pool burning (W/m) p peak overpressure (N/m) impulse (Ns/m) C concentration (ppm) T time interval (min) Supplementary data Probit Conversion 8 8 7 7 6 Probits $ 3 3 2 0 10 20 30 40 50 60 70 80 90 100 Percentages % 0 0 1 0 3.12 3.45 2.95 3.82 2.67 3.77 4.19 3.25 3.92 3.36 3.96 3.52 4.05 3.59 4.08 3.66 4.12 10 3.72 3.87 4.01 20 4.16 4.26 4.29 4.33 4.36 4.39 442 4.45 4.23 4.53 30 4.56 4.61 4.48 4.75 4.50 4.77 4.59 4.85 4.64 4.90 4.67 4.92 4.69 495 4.72 4.97 40 4.80 4.82 4.87 50 5.00 5.03 5.05 5.08 5.10 5.13 5.18 5.20 5.23 5.15 5.41 60 5.28 5.31 5.33 5.36 5.39 5.44 5.47 5.50 5.25 5.52 70 5.55 5.88 5.58 5.92 5.61 5.95 5.64 5.99 5.67 6.04 5.71 6.08 5.74 6.13 5.77 6.18 5.81 6.23 80 5.84 90 6.28 6.34 6,41 6.48 6.55 6.64 6.75 6.88 705 7.33 % 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 08 0.9 99 733 7.37 7.41 746 7.51 7.58 7.65 7.75 788 8.09