Update: At this point I am of the thought the pump just pushes harder. Now I am at the stage of trying to get the pipe losses in a 6mm diameter steel tube with water going through at 33m/s. This goes past my moodly chart, and therefore the answers seem to give giant pressure drops...
Hey, so my situation is a positive displacement pump churning out 30gpm. Theres a bunch of pipe losses that I can deal with, and then a long 1.5" pipe with 8 possible outlets (you can screw on a hose). When one hose is attached the pressure is a we will say P1 (read from a gauge on the 1.5"...