J
Jalisco Kid
Guest
Like you, I'm learning this shit by the seat of my pants, so bear with me - that being said, I *think* I can answer your questions (but please JG or JK correct me if I'm wrong).
1) To figure out your true PSI, you'd need one of these:
http://www.google.com/products/cata...og_result&ct=result&resnum=3&ved=0CD4Q8wIwAg#
2) Your real flow rate you could estimate pretty well (post #18 from the link above has the mathematical breakdown, but it's pretty simple to figure out), but you'd have to account for some variables that the equation can't (distance, loss, etc.)
3) Can't help you on the regulator question
4) See #2 above..........figure out how many GPM will flow through your nozzles at a given PSI, then match that to a pump that can/will output roughly that amount (a little more is better, methinks) at that pressure.
Again, let me reiterate that's my understanding, but someone could correct me if I'm wrong.........
I would use 80% of what the manufacturer states, as they rarely preform at those flows. Plus you need to add run length,height,and 45* and 90* in your design. JK