debate

Discussion in 'Irrigation' started by aced76, Jul 1, 2011.

  1. WalkGood

    WalkGood LawnSite Bronze Member
    Posts: 1,910


    I wondered the same thing too. Was this on a private monster well pump? Inch and a half valves pre-existing?

    How did all those heads work properly BEFORE?
     
  2. GreenLight

    GreenLight LawnSite Senior Member
    Posts: 462

    I have been in a similar situation. Guy calls me, says his head pressure is horrible and would like me to take a look. Go to his monster house, start turning on zones and see has in some cases 14 rotors on a zone and on other zones he has 20 sprays, etc. I did a gpm test at meter to find he has nowhere near enough gallons and told him his problem. He said it worked fine "before". I said "before what" and he elaborated at that point that it used to draw from a lake way back behind the woodline.

    Long story short, I was fortunate enough that most spray zones were 180 degree 15 foot radial sprays hitting long narrow strips of turf. Ultimately I just put mp2000's in with prs heads and dialed down the radius a bit. The mps had no problem at only 16 gpm. I wouldn't recommend it for common practice, but it worked fine.
     
  3. aced76

    aced76 LawnSite Member
    Posts: 38

    Ok, Thanks for the input. The city put in a new tap after we had remodeled system for reclaimed water. We had to disconnect from the building water which had a one inch tap supply. The city put in a 3/4 tap, then a meter. We had to connect to this smaller tap.
    So we are stuck. We did NOT design existing system but it ran ok before the tap size went down to 3/4 from 1 inch.
    This is what I heard. Based on the amount of landscape in the proposed area the city installs a tap on their original approved site plan from years ago.
    They thought 3/4 would suffice. I guess from my point of view is maybe before tap is installed they should have a conversation with the contractor on needs of service, ie; head count and size per zone for correct flow and psi?
    Next time I will make sure and forward info ahead of time so we dont have this issue again.
    I do understand I can run MP's and precision nozzles based on this flow though, it just costs the owner a good deal of money that could of been avoided.
     
  4. I don't see a location for you but at least in Dallas area you could pay to have a new tap and meter run. even if it costs 800.00 it might be worth it for the customer to avoid hydraulic nightmares.
     
  5. txgrassguy

    txgrassguy LawnSite Gold Member
    Posts: 3,083

    Had a similar situation on a new install.
    2" meter, system designed for 65gpm through backflow regulated to 55 psi.
    Worked great for less than a week, G.C. calls me and says "It ain't spraying to good".
    End up speaking with the city ******os who say they removed the 2" tap, replaced it with a 3/4" and kept everything else the same. Ended up with maybe 38 gpm at 55 psi.
    Had to go in and split the sections by adding one additional valve at each duplex (apartment install of sixteen duplexes) and capping the looped lateral.
    Cost me eight extra days plus parts and the G.C. refused to pay saying the city was at fault - city refused saying they had the "right" to alter water availability. All the while I'm out an even nine grand waiting on money.
    City finally came back in and restored the 2" meter saying they "didn't have to pay" but I finally got my money. And no more jobs in that city either . . .
     
  6. aced76

    aced76 LawnSite Member
    Posts: 38

    Ya maybe, but I cut my price as it were and they can pay for that. The owners own a franchise of buildings nationally. I will also enhance the rotors possibly with rain curtain nozzles. I even thought of eliminating pop ups where we were getting boo-ku coverage as it is on a slope. Looks like MPs and precisions coming their way soon.
     
  7. greenmonster304

    greenmonster304 LawnSite Gold Member
    Posts: 3,039

     
  8. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,904

    it's a requirement of the Department of Redundancy Department
     
  9. Sprinkus

    Sprinkus LawnSite Silver Member
    Posts: 2,075

    1" prv and 1" dcv for 46 gpm?
    Even if you could eek out 46 gpm from the tap the pressure loss through the 1" prv at 46 gpm would be tremendous.
    In fact that flow wasn't even listed on the pressure fall off chart that I looked at.
     
  10. hoskm01

    hoskm01 LawnSite Fanatic
    Posts: 5,690

    I would kill for a tap fee that low. Try 12k here.
     

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