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Process hazard analyses of control and instrument systems
Author(s) -
Freeman Raymond A.
Publication year - 2001
Publication title -
process safety progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.378
H-Index - 40
eISSN - 1547-5913
pISSN - 1066-8527
DOI - 10.1002/prs.680200307
Subject(s) - hazard and operability study , process safety management , process (computing) , risk analysis (engineering) , operability , flammable liquid , documentation , process safety , hazard analysis , reliability engineering , hazard , engineering , system safety , control (management) , process control , computer science , systems engineering , work in process , hazardous waste , operations management , business , waste management , programming language , chemistry , organic chemistry , artificial intelligence , operating system
The OSHA process safety management (PSM) and EPA risk management program (RMP) standards require that process hazards analyses (PHAs) be performed on processes that contain listed toxic or flammable chemicals. A number of PHA techniques are listed in both standards that can be used to satisfy this requirement. Typical PHA studies use analysis techniques, such as hazard and operability (HAZOP), what‐if, and checklists, to review potential hazards, such as deviations from normal process conditions of flow, temperature, pressure, etc. The influences of control and instrument system failures on process system safety are usually considered indirectly. This paper reviews some of the considerations needed to conduct a PHA that includes control and instrument system failures. Information on (1) how to organize the review analysis team, (2) what type of documentation is needed, and (3) the special considerations needed in a control and instrument system review are included in this paper. The wide use of advanced programmable and electronic systems in the chemical process industry introduces a number of special considerations that must also be included in a review. These considerations are also discussed in this paper.