In this paper, a knowledge-based information system for the plant operation of steel making company has been proposed. This system, which is named as K-VRS (Knowledge-based Virtual Reality System), provides a connection between ERP PM module and knowledge-based engineering methodologies, and thus, enables network-based highly effective PM process. While the virtual plant is used for the master of K-VRS, there are four expert modules attached; engineering document management module, real time lifetime estimation module, fitness for service module and risk-based inspection module. Each module provides engineering knowledge based evaluation and judgment for more effective PM. K-VRS provides collaborative and concurrent working environment to workers and relevant experts. The developed system is expected to play a great role for plant life extension.

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