Study on the Failure Identifiability of Disaster Detection System

There is a serious potential risk in the petrochemical production process, the Disaster Detection System(DDS) is of key equipment to monitor the production status, prevent and control the potential risk. However, the Initiating failure and Inhibiting failure would occur in the period of the Disaster Detection System(DDS) working. In order to identify the two failures by DDS itself, the paper proposed a mathematic method for finding the fault test codes based on the theory of Bayle derivation, and verified it on the FCC (Fluidized Catalytic Cracking Unit) of a petrochemical company. The results evidence that according to the property of the Boolean difference, the codes are available to fined DDS failures; in order to identification of DDS failure it is necessary to properly design the combinational logic unit for ensure it has the fault test codes; if the DDS failure that had been judged to be identification, the fault test codes should always be input to DDS timely to implement self fault test so that its failure may be able to find. Through such means the DDS functions should be achieved correctly.