stat for engineers 3.4 Management system failures. Refer to the Process Safety P

Question

stat for engineers 3.4 Management system failures. Refer to the Process Safety Progress (Dec. 2004) study of 83 industrial accidents caused by management system failures, Exercise 24 (p. 17). A summary of the root causes of these 83 incidents is reproduced in the table. Management System Cause Category Engineering & Desigrn Procedures& Practices Management & Oversight Number of Incidents 27 24 10 Training &Communication; Total 83 Source: Blair, A. S. "Management system failures identified in incidents investigated by the U.S. Chemical Safety and Hazard Investigation Board." Process Safety Progress, Vol. 23, No. 4 Dec. 2004 (Table 1). 3.

Explanation / Answer

answer of part (a)

since total event =83 and

event due to faulty engineerning and desing=27

so requried probability=27/83=0.3253

answer of part (b)

since total event =83 and

event due to faulty procedure and practice=24

requried probability of event other than  faulty procedure and practice=1-24/83=1-0.289=0.711

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