Piping and Instrumentation Diagrams (P&IDs) are key documents during the construction of chemical plants and other facilities in the area of process engineering. They can be described by a graph structure in which the pipes and signal lines are the connecting edges between individual equipment nodes (e.g. reactors, valves, sensors, controllers, actuators). When digitizing P&IDs from paper-based and similar optical sources, the first step is the extraction of a graph of connected

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... However, additional enrichment and corrections are needed in order to achieve graph structure that fully captures the given input in a semantically meaningful way. In this paper, an approach in which graph-based rules are used to modify the P&ID-describing graph structures is presented. The objective is to enable the user to conveniently generate customized rules for different scenarios. The approach is evaluated by a survey of sample graphs.