<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">My second is for spray head zones. I am having trouble figuring how many sprays I can put on a 1" line.<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
The Hunter design guide
http://www.hunterindustries.com/Resources/Design/design_guide.html on page 6 recommends a max flow of 13 gpm for 1 inch poly or Sch 40 PVC and a max of 16 gpm for Class 200 PVC. This should allow you to figure the maximum spray heads per line or zone based on the gpm of the spray heads.
Once you know gallons per line or zone, you need to figure the pressure at that flow rate at the sprayer heads. Static pressure of 65-70 is basically at 0 gpm. And filling a bucket to determine flow rate is gallons per minute at 0 psi. The irrigationtutorials.com have a nice section on figuring design pressure using "dry" and "wet" methods.