Abstract
Fault (or success) trees constructed from circuit diagrams having multiple inputs and outputs and/or bridged circuits are equivalent Boolean representations which do not, necessarily, bear any resemblance to the original circuit diagram. In this paper we show how this problem can be avoided and how a sequenced-fault tree, in which the events are arranged in the order in which they appear on the flow sheet, can be constructed. The construction of the tree is preceded by the development of an “Event Diagram” which is more convenient than a reliability block diagram if common mode failures or multiple prerequisite events are involved in system failure.
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