Natural gas (CH4) is transported through a 6 in. ID pipeline at a rate of 10,000 scfm. The compressor stations are 150 mi apart, and the compressor suction pressure is to be maintained at 10 psig...

Natural gas (CH4) is transported through a 6 in. ID pipeline at a rate of 10,000 scfm. The compressor stations are 150 mi apart, and the compressor suction pressure is to be maintained at 10 psig above that at which choked flow would occur in the pipeline. The compressors are each two stage, operate adiabatically with interstage cooling to 708F, and have an efficiency of 60%. If the pipeline temperature is 708F, calculate:

(a) The discharge pressure, interstage pressure, and compression ratio for the compressor stations.

(b) The horsepower required at each compressor station.