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Cut Sets and Path Sets
Cut sets and path sets are useful when looking at overall system reliability. The following table describes cut sets and path sets.
Term
Description
Cut set
A set of components whose failure ensures the failure of the system. A cut set is a set of blocks in the diagram that can prevent a successful path from the diagram’s start node to its end node.
Path set
A set of components whose operation ensures the successful operation of the system. A path set, which is also known as a tie set, is a set of blocks in the diagram that represent a successful path from the start node to the end node. Each path set contains at least one cut set component. If a cut set component fails, then the path fails. However, if all of the components in a path set are functioning, then the path is successful.
Cut sets and path sets are not used in RBD calculation equations. They are available for informational purposes only. When you run RBD calculations, you indicate whether you want to calculate cut sets or path sets. If cut sets or path sets are calculated, you can view and highlight them in the diagram. For more information, see: