Originally Posted by Sawtooth
My question is, with a wildland pump (a mini striker, specifically), which is almost always running at full bore regardless of hose diameter, will the heightened volume of water in the 1.5" hose have more of an effect on nozzle pressure than the friction loss of the 1" hose? It seems a lot of guys I talk to think that with the larger diameter hose, the small pump will be pushing more water and you will therefore experience less nozzle pressure. I'm just not sure if this is the case given the significant difference in friction loss.
I think the opposite would be true, all things equal. The pump isn't necessarily pushing more water (water mass isn't going to make a huge difference). The flow is going to be restricted by the 5/8" hose and the nozzle you have at the end of it. My guess is that you're actually pushing about 10 GPM through the tip? If you were pushing 100 GPM, you'd be dribbling out the tip at best regardless of the hose size with that pump. (see attached photo for pump max specs)
Based on my assumption of 10 GPM, your 100' of 1" line will lose 1.5 psi, the 1.5" line will lose approx 0.24 psi. Pretty minimal difference...
My opinion - if the mini striker is your source pump, I think you've got the best balance with the 1" hose.