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Here, I'll try and state what I mean more clearly.
Take a pipe and cap one end. Drill equal sized holes in equally spaced from the capped end to the open end. Put pressure gauges opposite each hole. Pump air in the open end of the pipe.
You will see lower pressures as you get farther away from the source of the air. This is due to the frictional losses of air traveling FAST over the surfaces inside the pipe.
You can MINIMIZE these pressure differences by doing the following:
1) Make the Pipe really big in diameter compared to the "leaks".... basically this is a "tank". The air will travel more slowly over the surfaces since it has more room to move around.
2) Make the pipe really short, the total distance the high speed air has to travel has minimal surface to contact with.
3) Make the insides of the pipes ultra smooth... may help.
This also holds for water or any other fluid or gas flowing through a pipe at a steady rate.
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