This is a conference paper. It was presented at ICheaP-9, the ninth International Conference on Chemical & Process Engineering \ud 10-13 May 2009, Rome, Italy. The definitive version is available at: http://dx.doi.org/10.3303/CET0917214Cause & Effect (C&E) analysis for process plants is one of the tasks associated with Process Control\ud Engineering (PCE). With the availability of electronic Piping and Instrumentation Diagrams (P&IDs), a\ud Computer-Aided system is developed to carry out the analysis automatically by encoding knowledge related to\ud PCE in rules so that they can be applied to a given set of P&IDs to produce the corresponding C&E Diagrams.\ud This paper describes how this is achieved. A rule-based system and an instrument checker are developed. They\ud are used to generate the results and the results are displayed in a format that complies with ISO 10418 (ISO,\ud 2003)
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