Hello all! I'm having some strange results trying to put in a irrigation system and it has to do with pipe sizes. I have a 3" main coming into this area that is supposed to be around 100 gpm and basically about 80 P.S.I I have learned in the past not to trust manufactures flow charts on their nozzles so I always run a "test" manifold as to get max results but am finding weird results. Using Hunter i40 rotors I am finding that placing 8 rotors directly off 3" main with a 2" Tee I am @ 60 p.s.i and seem to have good steady flow without kicking the pump into a feedback shutdown. These rotors are all within a 20' length of pipe and bumping the rotors up to 10 drops pressure to 40 P.S.I and significantly drops the radius by 5'-8' so I'm going to call 8 good. Now the weird part, if I move my test manifold to another existing spot 180' down a 2" main and controlled through an 1-1/2" valve and 15' of 1-1/2" pipe my results barely change which goes against every flow chart out there but they are always based on 100' runs which really has me guessing how to properly size the pipe. Logic tells you to run a 3" valve into a 3" pipe to first 2 sprinklers, then 2-1/2" pipe to next 2, 2" next 2, 1-1/2" to the final 2 but when I experiment I find no difference. I am seeing I can run 2" through a 2" valve and cut the pipe down to 1-1/2" for half the run and probably 1" to the last sprinklers. Obviously Im trying to maximize cost efficiency in Valves and controllers since we have switched to DIG solar controllers instead of wires for obvious reasons ( mice voles gophers) at first I though GO BIG and spray a 60' radius but the zones needed added double the valves/controls/boxes but more so maintenance and trouble shooting How would you size your pipe on a 200' zone with 8 rotors and would you use a 2" valve?