Nozzle Tip Discharge

[yangrui115]

Does nozzle tip discharge considered open-end discharge?
If so, it will solve all my problems.
Here is my situation:
I have a 1-1/2" water line coming in with 65psi. I want to plumb from the in-coming water line to a series of nozzles.
My target is to spray 67gpm at 60psi at the nozzle tip. How do I know if I have enough GPM at the incoming water line?
Can I consider nozzle tip to be an open-end discharge? So that I could use the Pressure Loss--Flow Chart. Or should I consider nozzle tip at a pressure of 60psi? Then how to calculate the GPM?

 

[BigInch]

Its not the same as open-ended flow. That's usually reserved for culverts with pressure on the inlet, flowing full at the inlet, and discharging to atmospheric pressure at the outlet, which implies that the pipe outlet is not, or need not, be flowing full.

Sprinklers and nozzles can generally be simulated using,

Q = Cd * D² * P^1/2

Cd is around 0.97
P is a constant pressure to be held at the pipe end; the upstream side of the nozzle.

The pipe itself can be sized using any appropriate flow:head loss formula.





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[Artisi]

Knowing how many nozzles would be a good start and do you require 67gpm at 65PSI for each nozzle?