000			01634nab a2200205 4500
005			20260520004223.0
008			260224s2008 xxu
245	0	0	_aLayered digraph model for HAZOP analysis of chemical processes
260			_a _b _cdic. 2008
270			_a11/05/2011 ; 11/05/2011
300			_a13 p. ; 293-305
520			_aTranscripción del resumen del autor. Process modeling has remained challenging in the area of automating hazard and operability (HAZOP) analysis of complex chemical processes. Even though signed digraph(SDG) model has been proposed and widely applied in various HAZOP expert systems in the past one decade, the limitations of SDG have not been recognized and discussed in literature. The drawbacks of SDG models have caused incompleteness of HAZOP analysis results, which poses a significant limitation on wide acceptance of HAZOP expert systems in industrial practices. In this work, layered digraph (LDG) model extended from SDG is introduced to overcome the drawbacks of SDG models. Knowledge storage and management of LDG models are discussed in detail. Industrial case studies are used to illustrate the effectiveness of this new modeling methodology. Since process variables, process deviations, and interactions of deviations are explicitly decoupled in three dimensions, LDG model has shown to provide a much more flexible and comprehensive mechanism for HAZOP analysis.
581			_a4
773	0		_tProcess safety progress _g27
942			_cARTICULO
100	1		_aCui, Lin _949817
100	1		_aZhao, Jinsong _949818
100	1		_aQiu, Tong _949819
999			_c181632 _d181632