Abstract
Expert systems are computer programs that make an expert’s knowledge within a specific domain available to help solve complex problems. Operators of boiler feedwater water treatment systems must make decisions about required corrective actions based on water analyses and the consequences of those actions on other system variables. The Water Treatment Assistant will diagnose the analytical results, compare them with recent past results and with operating limits, and display the desired course of action. The system is customized for each plant and explains the logic of its advice in locally used terms that the operator understands. The programs have been most successful as aids to reinforce training and in plants where local expertise is absent.