Cooling towers can be standalone units or part of a more complex water system. They are generally rated by GPM, which is their ability to cool a liquid in one minute to a specific design temperature. Water systems in a steel mill can be for cooling caster molds, electric arc furnace side walls and roof, or any other area that requires cooling water. Most water systems use centrifugal or vertical pumps. Contact Casey Equipment for a quote on used cooling towers for sale.