I had a quick conceptual question about adding different pipe line pressures into the same header. I was wondering if I a system like the one in the attached paint file (sorry could not figure out how to paste the object) where I have a 50 PSI supply Line and a 80 PSI supply line joining at a common header all 2" line, the total line pressure would only be 80 PSI not 140 PSI correct (ignoring frictional losses)? So if i were to buy PVC pipe for this system I would only need it rated at 100 PSI not 150 correct? Also, would the water hammer from the valve cycling cause a significant increase in pressure where I would need to be concerned about the lines integrity?
Thanks in advance for all your help, I am not too good with pipe systems yet and am trying to get these basic concepts down.