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This is incorrect!!!
But even if your water supply can really provide 20GPM @ 40+psi, and maintain that for the expected duration of a watering schedule, you can always design for a flow of about around 12GPM or less (just limit the number of spray heads per circuit), then you can stick with 1" pipe.
...the best way to run a pump is to have it come on and stay on. if you desing for 12 gpm then the pump will cycle. that means it will turn on and off based on the pressure regulator...
Thank you both for the response. I did the wet test just like the tutorial said I will do it again with a different gauge just to make sure. If all is correct then I would be right to increase the main line to slow things down. and when you guys say a design of 12,14,16 GPM's, what ever your design flow is, that's what the capacity of all the heads in a zone should equal or close too, to operate properly.
This may not be true! Are you talking about a submersible well pump? That is what I have most experience with."
But, on a well, you have an opportunity to adjust the pressure switch, for a higher operating pressure. Do a flow test at 60 or 70 psi, if you want to work with I-20 heads.
For example use 5 heads at 2.5 gpm and youlll have 12.5 gpm for that zone. Youll have to use the correct nozzles for each head. Also remember you can use nozzles with half the gpm if they are only doing 180 deg vs heads that are 360 on the same zone.Thank you both for the response. I did the wet test just like the tutorial said I will do it again with a different guage just to make sure. If all is correct then I would be right to increase the main line to slow things down. and when you guys say a design of 12,14,16 GPM's, what ever your design flow is, thats what the capacity of all the heads in a zone should equal or close too, to opperate properly.