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Several different analysis techniques are in common use in the
process industries today to evaluate the safety and/or of
chemical plants at the design stage. These includeques as a
fault-tree analysis, and HAZOP (hazard anstudies). These tools
have been very useful ine safety/reliability analysis more
systematic ands dependent on rules-of-thumb andarbitrarydesign
phases of process plant projects. One major drawback of the
techniques in common use, however,that they are all essentially
discrete analysis methods. Aent is either in a normal or a
failed state; a process isn a safe or an unsafe condition.
Analysis along thesevery valuable, but it leaves out the very
importantIn reality, a process exhibits a wide range ofr. A
change, sudden failure or gradualin a component will lead to a
time-dependenttate of the process. It does not shift from a
safee instantaneously. Fault-dynamic modeling (FDM) is an
evaluation technique thatcludes an assessment of the time-
dependent behavior of aesulting from a process disturbance. The
FDM techniquethe following steps:(1)identification of
componentlures which can result in result in specific
rocessfault tree analysis;(2) development of realisticmodels of
the process;(3) detailed study ofusing time-dependent model;(4)
appropriateon when desired. The present study combines fault-
tree analysis as well as-dynamic modeling to analyze a benzene
chlorinator. The moretional fault-tree analysis is used for
hazard analysis forupset. Then, fault-dynamic modeling is
employed tome factor for top event.
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