Mrfixit, thanks for uploading my pictures for me. I could not find any instructions on how to do it, so tried Dropbox.
I got 8 heads replaced this morning. 4 Full Circle and 4 Half Circle. I began by installing just one Full Circle with 3.0 nozzle (2.7 gpm) and left the other lines capped (except for a test gauge at one of the head locations). Then I installed 3 more Full Circle (9 gpm total demand @ 2.26 gpm each). Finally I installed the 4 Half Circle @ 1.5 nozzles (1.12 gpm). Total demand of approximately 13.5 gpm.
Pressure gauges at Vacuum Breaker and at head location were as follows:
VB STATIC: 44 psi
VB with approx. 2.7 gpm demand due to higher pressure at head: 40 psi
Pressure at head gauge: 37 psi
VB STATIC: 45 psi
VB with 9 gpm demand: 38 psi
Pressure at head gauge: 27 psi
VB STATIC: 46 psi
VB with 13.5 gpm demand: 35 psi
Unable to take reading at a head location as all 8 heads were now installed, but pressure at head likely 20 to 21 psi, if same pattern of about 1 psi loss for each gpm. Trying to run all 8 heads at once is too much demand, and puts pressure at head below the 25 psi minimum recommended.
The STATIC readings went up slightly as the early morning demand (from 7:30 am to 9:30 am) in my neighborhood eased.
I am optimistic that if I run 2 Full Circle and 2 Half Circle for a total just under 7 gpm demand that the performance will be acceptable. This first zone is the most demanding (longest run) of my three main large lawn areas zones.
I will try turning off flow at half of the heads this evening and see how good of a spray I get.
This was the spray with just one (1) Full Circle head with a 3.0 nozzle (2.7 gpm) installed. I have not done any experimenting with reducing the spray distance yet. The heads in this zone vary from 30' to 35' apart, and spray was easily going that far.
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This post has been edited 1 times, last edit by "lawnperson" (Aug 31st 2023, 11:58am)