A centrifugal compressor has a polytropic efficiency of 78% for a gas with a molar mass of 17.5 and a heat capacity ratio of 1.17. The gas is compressed from 640 to 1,050 psig (44.1–72.4 barg);...

A centrifugal compressor has a polytropic efficiency of 78% for a gas with a molar mass of 17.5 and a heat capacity ratio of 1.17. The gas is compressed from 640 to 1,050 psig (44.1–72.4 barg); suction temperature is 86°F (30°C) and the gas volume is 690 MMscfd (18.5×106 Nm3 ). What is the hp (MW) of the compressor? Assume the compressibility factor is one in the calculations.