Calculate the source pressure required to deliver 13 x 10⁶ standard cubic feet per day (SCFD) of CO to a customer 60 mi. away. By contract the pressure at the customer's site must be at least 300 lb_ƒ/in.² gauge. The pipe is 10 in. in diameter. Long pipelines may be considered isothermal at the ground temperature of 60°F. Standard conditions are T= 70°F, p= 1 atm.