We run 300' preconnected and 200' preconnected 1 3/4" lines with fog nozzles. We did flow tests and a bunch of scenarios based on our typical operations and found that we wanted the 200' lines pumped at 130 psi and the 300' lines pumped at 150 psi.

Then we went to the guy that decals our trucks and had him make little stickers that go on the discharge gauges, about the size of a quarter, and stuck'em on there. Obviously this doesn't account for all of the variables, but if the pump operator sets them at the "sticker" to start we are in the ball park.