Recovered petroleum crude oil from reservoirs includes several impurities such as, drilling water, salts & sand and polymers. In order to remove these impurities from crude oil, desalting systems are used which is also known as oil desalting systems. Oil desalting systems is used to remove salts from oil so that it can be processed in a refinery. If in case oil is not treated with the desalting systems then the impurities, salt and water present in oil will causes problems in operations as well as in maintenance which includes abrasion, fouling of equipment, corrosion and poisoning of catalysts in processing division. Oil desalting systems is very effective methods to reduce water and salt content from oil. The system is embedded with different components such as electrodes, level control device, process levels, mud wash. Oil desalting systems is usually the primary process in the upstream operations. On the basis of specification, oil desalting systems is dependent on a few fundamental parameters such as Pressure, temperature, flow rate and fluid viscosity.