Qualitative and quantitative models in a model-based diagnosis system for ballast tank systems

In this paper we describe a model-based approach to the fault diagnosis of ballast tank systems as e.g. used in offshore plants. We focus on the use of multiple models for device components. Multiple models adequately reflect the insight that for different diagnosis problems different model granularity is required. We present a simplified quantitative and a qualitative model as a starting point for our endeavour to cover all relevant faults. After describing a diagnosis session on a multiple fault in detail, we discuss current limitations and perspectives of our work