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Maintaining and troubleshooting aircraft carriers through tank piping systems is a labor intensive, operational fleet problem. There is a clear need for a useful database and expert system to aid in fault isolation and repair planning for these systems. The multiple extensive piping systems of an aircraft carrier create an intimidating modelling problem for implementation in a database. The interface of an expert system to a large database to obtain improved execution speed, exploit a useful data model, reduce memory requirements, and enhance total system capability is examined and implemented. A flexible model for representing a large ship's piping systems in a database is presented.