Normally, the pressure drop for gases flowing through pipes without packing can be neglected. For flow in pipes, the pressure drop along the length of the pipe can be approximated by
where f is the Fanning friction factor, D is the pipe diameter, and the other parameters are the same as previously defined.
For the flow conditions given in Example 5-4 in a 1000-ft length of 1½-inch schedule 40 pipe (αp = 0.0118 ft–3), the pressure drop is less than 10%. However, for high volumetric flow rates through ...