In this study, Pressure drops in a pipe according to cylinderical particle that has been calculated and analyzed. In general, it is used in a interior ballistic cylindrical particle shape. The analysis of 10 cases for Reynolds number has been conducted in 3 cases cylindrical particle. The results have been compared to the Ergun"s empirical equation which predicts pressure drop in pipe. To reduce difference between the Ergun"s empirical equation and the numerical results, calibration has been conducted.