Ya, Any plumbing manual. Head pressure is only the verticle height. It does not matter the diameter of the pipe. Now, when talking Flow restriction, that goes by pipe diameter, But if you have a 1" pump outlet, Doesnt matter if its 1" all the way up, or if it expands to a 6" pipe, the head pressure at the pump will be the same. GPM flow may be affected by the smaller pipe and friction loss, but not head pressure.
Think of it this way, Head pressure is in PSI, right? So, take a 1"x1" column of water 6' high. It has X head pressure. Now take a 6" pipe, Head pressure is still measured in PSI. Yes, the pipe is larger, but you only take a 1"x1" section of the pipe for figuring head pressure.
Or, take my fish tank, 150g, 5'x2'x2' Its 2' high, does not matter that the tank is 5' long, or 50' long, the pressure(PSI) at the bottom of the tank is the same, Its dependant on height, not LxW
Hope that helps
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Dan Pesonen
Umm, a tank or 5
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