Preventive maintenance is essential for every chemical production site, as it can prevent equipment failure and accidents. In order to minimize the production loss caused by maintenance, the maintenance has to be carefully scheduled. To obtain an optimal maintenance strategy for a whole production site, the maintenance schedules of the production and utility plant have to be tackled simultaneously considering site-wide utility and material balances. However, the interconnections between production and utility system make the scheduling problem become very complex and difficult. In this paper, a multi-period mixed integer linear programming model, Site Model, is proposed as an aid to optimize short-term site-wide maintenance schedule. A special formulation is adopted to handle pre-set utility and material demand profiles during the shutdown, maintenance and start-up periods of plants.
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