The sales gas from a gas plant is compressed from 330 to 1,000 psig (22.7–69.0 barg) to meet pipeline requirements using a centrifugal compressor. The compressor has an isentropic efficiency of 75%...

The sales gas from a gas plant is compressed from 330 to 1,000 psig (22.7–69.0 barg) to meet pipeline requirements using a centrifugal compressor. The compressor has an isentropic efficiency of 75% and the gas turbine has a heat rate of 8,200 Btu/hp-h (11,600 kJ/kWh). Low-pressure sales gas is the fuel to the gas turbine. The gas is 99vol% methane and 1 vol% ethane. Assuming the suction temperature is 60°F (15.6°C) and the heat capacity ratio is constant at that temperature, what fraction of low-pressure sales gas is consumed in compressing the gas to pipeline specifications?