The pipeline goes from an underground storage field to a city gate station located 50 miles far. The pressure required at the gate station is 200 psig A compression station installed at the storage field provides a maximum of 1,000 psig. Required gas flow rate: 80 MM SCF/D Gas specific gravity = 0.58 Gas critical pressure = 670 psia Gas critical temperature = 350 R Average gas flowing temperature: 80F Determine the size (diameter) of this pipeline.