Transcripción del resumen del autor. Refining and petrochemical cooling water systems often provide the most difficult challenges in the water treatment industry. High skin temperatures and low water velocities, degrading quality of incoming make up water streams, tightening environmental restrictions combined with shrinking capital and variable budgets continue to increase the difficulty in treating these systems. The combination of stresses can adversely impact reliable operation of the asset. Poor performance of a cooling water system will increase the unit's total costs and reduce the assets reliability and throughput. Corrosion and scale will adversely impact the site's ability to operate reliably. Corrosion can lead to unplanned outages due to exchanger leaks. These can result in lost production/profit opportunities, increased maintenance costs and possible environmental issues. Scale deposition inside exchangers will reduce heat transfer, increasing energy consumption and possibly requiring unscheduled outages to clean exchangers. In this paper we will review Nalco Company's approach to addressing the whole system. This approach has been utilized with great success within Nalco during the past 5 years. It can be summarized into two broad application points: 3D TRASAR technology and the "MOC Approach." This total system approach was utilized at ExxonMobil (Esso) Refinery in Campana, Argentina and the results are shared in this report.