A gas transmission pipe DN 250 mm (OD 273.1 mm, t = 9.5 mm) carries 75 000 m^{3}/h at base condition (1 atm, 15.5 °C). Design temperature 120 °C, pressure 36 barg. Find (1) the velocity of gas in the pipeline (m/s) and (2) the head loss for 1 km at design condition (m of gas column). Neglect compressibility; friction factor 0.015 (Darcy).