This work deals with hydraulic machines engineering. It is an engineering study introduced to show some of the design considerations that must be perceived to avoid set of the common engineering mistakes. These mistakes are clarified practically depending on the case study adopted in fuel oil unloading system at one of the main power plants in country of Jordan. Fuel oil unloading system at Amman power station works with an overall efficiency of about 13.8%. This low efficiency comes from several design mistakes, which are mistakes in the pumps number selected and arrangement selection, pumps characteristics selection and pumps suction head selection. This work introduces two alternatives to solve these problems in shade of the design considerations deduced from the existing design mistakes and “Repowering” concept. The first alternative is to replace the pumps used in this system with screw type pumps; this solution increases the efficiency to about 75% and makes savings of about $11,283 annually for pay back period of 20 years. The second solution is to operate the existing pump in a different manner with making slight changes in the system; this solution increases the efficiency to about 37.96% and makes savings of about $11,174 annually with neglected capital cost. The economic- engineering optimization overbalances the first solution, as it is correlated with softer, safer and reliable performance in addition to the economic saving.

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