If I am using 1 inch poly for laterals, 1 inch poly has a maximum recommended flow rate of 13 gpm or less. That would mean a maximum of 5 rotors at 2.5 gpm or 4 rotors at 3 gpm. More rotors would require going to either 1.25 poly or 1 inch Class 200 PVC.
So if I want to use 1 inch poly, I need to check what pressure I have at 13 gpm or find gallons per minute at 50 psi. Both of these should be fairly simple to determine with a Tee, a pressure gauge, a ball valve and a bucket.
Thanks,
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Rob