APPLICATION AREAS OF THE DYLAM APPROACH TO THE SAFETY ANALYSIS OF CHEMICAL PROCESSES
Many approaches have been proposed in the recent past for computer aided synthesis of fault trees. All these methods do not account satisfactorily for the physics of the process, neither are they able to take into account time aspects. Just the same difficulties can be found when the fault tree is made in a manual way. This paper presents many possible applications of the DYLAM (1) methodology to the safety analysis of typical physico-chemical processes and equipments. This methodology generates the different sequences of events that can be produced by failures in the system, using the values of the physical variables and not a logical decision. Besides DYLAM predicts the frequency rate of those sequences or combinations of events that may really occur. Among DYLAM applications to chemical plants the following can be mentioned: chemical reactors of different kind (continuous stirred reactors, batch reactors, heterogeneous reactors, radical kinetics reactors, etc.), where runaway reactions are possible; distillations columns, heat exchangers, reboilers, etc., where several dangerous situations may appear because of changes in process conditions or operator/instrument failures. Besides the DYLAM code, the key point in any application is the availability of different models that represent the transient behaviour of the system or equipment under the failure conditions analyzed. These transient models or equations are obtained by numerical solutions of the differential equations expressing the heat and mass balances that interpret the evolution studied. Some transient models will be described and the results of the safety analysis to certain special cases will be presented, showing the practical advantages and limits of the methodology proposed.
Bibliographic Reference: VTH EUREDATA CONFERENCE, HEIDELBERG (GERMANY), APRIL 9-11, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32251 ORA
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Record Number: 1989124109200 / Last updated on: 1987-01-01
Available languages: en