A 2psi system using 2½” schedule 40 iron pipe is being designed. This system is to deliver 17,800 cf/hr of gas, gravity is .6, with a pressure drop of 1.0psi. The maximum allowable length for this system is?

A 2psi system using 2½” schedule 40 iron pipe is being designed. This system is to deliver 17,800 cf/hr of gas, gravity is .6, with a pressure drop of 1.0psi. The maximum allowable length for this system is?