Rotor Head Hookup question

Discussion in 'Irrigation' started by turbosl2, Jul 6, 2012.

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  1. bcg

    bcg LawnSite Bronze Member
    from Tx
    Posts: 1,835

    What he said, if you've got 50PSI static, you do not have anywhere near that dynamic. I'd bet your dynamic reading is more like 35PSI or less (just a rough guess). You need to run the math on the hydraulics and figure out what your supply really is or how much you need to increase your pipe sizes.

    The funny pipe swing joint isn't the problem.
     
    Last edited: Jul 7, 2012
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,966

    Thing is, is the soil is really sandy, the system may be pushing the envelope to cover all the plantings, and is better off with crappy pressure and maximum flow.

    The textbook solution would have been a separate one-inch tap at the street. Curbside meter in a large pit that can also hold a DCVA and master valve. One-and-a-half inch mainline.
     
  3. Then swap them out to maxipaws?
     
  4. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,966

    a Maxipaw with the 3/16 nozzle might just get you that 40 feet and 6 gpm
     
  5. turbosl2

    turbosl2 LawnSite Member
    Posts: 56

    I just came back from messing around with the system for the last few hrs. Here are some updates.
    I reduced the total of all nozzles to be 10-11GPM vice 12. Substantial increase in throw distance. On a 5GPM nozzle i am now throwing about 36-38', and a 4GPM i am at around 35-36'. Some are at the 32-34 mark too.

    The zone that i was chucking 25' had a 6GPM and an 8GPM. I switched them both to 5GPM and i am at about 38'. It doesnt look like any of the streams to touch another head, i am short on most all of them, that i cannot fix. Its a screw up. Everything does get covered but not like it should. I cannot get the end of the stream to touch another head like i wish.
    It seems that 5GPM is the max nozzle size and the sweet spot, if i try to go any large the distance falls short by ALOT.
    So i have 3-4GPMs in the 180s, 5GPMS in the 360s, and 1.5-2GPMs in the 90s.

    I really looked at the pattern, and i think the only thing i am not happy with is how the "rain curtain technology" Everything does get wet inside the circle but i still think about 30% more water goes to the last 2' of arc. My soil being so sandy it likes that 30% more water, but if i could have it more even i would be happier.

    What is a good head changeout to use. I have about 50 heads, but not going to replace all of them. I was looking at the Falcon 6504s because they have a tri nozzle design, vice a single like the 5004. Anyone like these. I was trying to stick with rainbird, and it looked like the 6504 could just screw right into the same base. So i dont have to do any digging. I see its a 1" inlet but i do not want to upgrade all the fittings and stuff like that.

    You are pretty much dead on with the distance of the 5004s. I am happy with the numbers but it is def low from what they claim.
     
  6. turbosl2

    turbosl2 LawnSite Member
    Posts: 56

    Ya you are correct. I should take some pics, the soil is pure sand. I think this is why on the coverage i end up with a the last 2' of the arc to be darker green while everything inside is barely holding its own this time of year. The last 2' with these heads has large water droplets, doesnt seem like even coverege like they claim. I am not interested in redoing everything, its thousands to have a new tap at the street, and i am 550' from the street, then another $1000 for a 1" or larger meter. 3/4" meter for residential is not that bad but anything more is commercial.
     
  7. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,966

    If you are almost satisfied with the system, the only real performance upgrade will be Maxipaw impact heads, because their impact drives outperform any gear drive rotor at low pressure.
     
  8. turbosl2

    turbosl2 LawnSite Member
    Posts: 56

    This is an impact type rotor? I have never used one.
     
  9. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,966

    I've done systems with Maxipaws where the street pressure was barely 50 psi. There was nothing else that had a chance of spraying 35 feet with only 25 psi at the head.
     
  10. turbosl2

    turbosl2 LawnSite Member
    Posts: 56

    I see them on sprinkler warehouse for about $18 each. I could give it a try, i always thought these types of sprinklers were lower end, but i could be wrong, i am not the expert
     
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