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During the different seasons of the year, the temperature of the oil tank goes up or down. The present work is composed of two parts, evaluation of the crude oil temperature and determining amount of wax precipitation. The numerical method has been developed for solving the energy equation and a thermodynamic model has been developed to predict wax precipitation based on average crude oil temperature. In the experimental investigation, a crude oil storage tank in Khark Island is selected as the case study and average crude oil temperature have been measured for two days and compared by the numerical result.