A system and method for detecting abnormal operation of a hydrocracker includes a hydrocracker model. The model may be configurable to include one or more regression models corresponding to different operating regions of the portion of the hydrocracker. The system and method may also determine if a monitored...http://www.google.de/patents/US8010292?utm_source=gb-gplus-sharePatent US8010292 - Method and system for detecting abnormal operation in a hydrocracker