Patent ID: 7739217

Claim:
A method for monitoring a polyethylene polymerization system, comprising: (a) providing an expert system comprising a database containing knowledge of the polymerization system and an inference engine, wherein the inference engine comprises: (i) a first rule having one or more preconditions, a suppressed-by attribute, and a message; and (ii) a second rule having one or more preconditions and a message, wherein at least one of the one or more preconditions is a suppressing precondition; (b) receiving data from the polymerization system; (c) evaluating the data from the polymerization system against one or more preconditions of the first rule and the second rule; (d) identifying the first rule as true or false; and (e) displaying the message of the second rule if all of the one or more preconditions of the second rule are met.