Capacitated Lot-Sizing and Scheduling with Sequence- Dependent setups in Petrochemical Plants.

In this work we developed a mathematical model to study the problem of capacitated lot sizing. The problem under study is concerned with multi-period planning and scheduling for a company that runs multiple plants to produce multiple grades of product. The company owns multiple warehouses and the raw material needed for production is provided by different suppliers. There is a setup cost for switching the production between the different product grades and the setup cost is sequence dependent. The problem under study is in the petrochemical manufacturing field. When different grades are produced in a petrochemical facility, a non-prime material is formed, this material depends on the production sequence of the differ grades. The model will answer questions related to supplier selection for raw material, production plan for each plant, inventory levels of the different grades at each plant, and warehouse selection to satisfy demand. [ABSTRACT FROM AUTHOR]