551st3800,
Gases (air) moving in a pipe are subject to frictional losses in flow dependent on the diameter of the pipe. The same holds true for each elbow, Tee or fitting the causes that gas to change direction or go through a narrowing.
These dynamics are important when you are dealing with things that flow in the very low CFM's and under very little pressure. Natural gas piping in your house would be an example.
The pressures and volumes encountered in a compressed air system probably wouldn't be affected (much) by these frictional losses.
I know there are some full fledges engineers on this site....sure hope they don't see my BS!
Stuart
