4. ( 30 points) A 0.70 specific gravity natural gas flows from a 2 -in. pipe through a 1.0 -in. orifice-type choke. The discharge coefficient of choke is 1.03 . The upstream pressure and temperature are 140 psia and 80F, respectively. The downstream pressure is 90psia (measured 2ft from the nozzle). The gas specific heat ratio is 1.25 . Assuming gas viscosity is 0.02cp and gas z-factor is 0.9 . a) What is the expected daily flow rate? b) Is icing a potential problem? c) What is the expected pressure at the nozzle outlet