Backflow Prevention Loop

Discussion in 'Irrigation' started by WetWell, Jul 20, 2006.

  1. WetWell

    WetWell LawnSite Member
    Posts: 59

  2. NC_Irrigator

    NC_Irrigator LawnSite Bronze Member
    from NC
    Posts: 1,416

    looks like his layout involved proper coverage of watering the house as well

    can a spicket really run all those heads?
     
  3. PurpHaze

    PurpHaze LawnSite Fanatic
    Posts: 5,496

    I read some of the comments on his article and he seems to care very little about the "minute possibility" of backflow contamination. I wonder if this guy figured in his stagnant pressure loss also? :laugh:

    No Otter Pops for him! :)
     
  4. Dirty Water

    Dirty Water LawnSite Fanatic
    Posts: 6,799

    What a idiot.

    The comments between him and the texas irrigator (Jerry? :D ) are amusing.
     
  5. HooKooDooKu

    HooKooDooKu LawnSite Member
    Posts: 70

    What I don't get with his logic of this loop forming a "high point" is the fact that the loop is lower than the hose bib to begin with.

    Stated another way, why even bother with the loop to form a high point if the hose bib has already located at a high point.

    Not that I agree with this loop being anything of a backflow preventer, but to properly follow his stated logic, it seems that you need a loop of tubing where the top of the tubing is about 12" higher than the hose bib.

    But good greif, since he's running this off of a garden hose to begin with, there are plenty of check valves available for about $5 (you know, the ones they sell for drip irrigation) that you could put at the start of the system. Obviously not as good as a real backflow preventer, but better than a loop of tubing.
     
  6. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 48,006

    There is an older form of backflow prevention that is known as a "barometric loop" which adds 35 feet of elevation to the concept - Since it is physically impossible to siphon water that high, such a loop will prevent backsiphonage.

    Hard to see how 70 feet of pipe is cheaper than a vacuum breaker, though.
     
  7. Flow Control

    Flow Control LawnSite Bronze Member
    Posts: 1,267

  8. WetWell

    WetWell LawnSite Member
    Posts: 59

    I think while adding these loops to irrigation systems this would be the best song for us to sing-

    Here we go loop de loop
    Here we go loop de lie
    Here we go loop de loop
    All on a Saturday night

    You put your right hand in
    You take your right hand out
    You give your hand a shake, shake, shake
    And turn yourself about

    Here we go loop de loop
    Here we go loop de lie
    Here we go loop de loop
    All on a Saturday night

    You put your left foot in
    You take your left foot out
    You give your foot a shake, shake, shake
    And turn yourself about

    Here we go loop de loop
    Here we go loop de lie
    Here we go loop de loop
    All on a Saturday night

    You put your right hip in
    You take your right hip out
    You give your right hip a shake, shake, shake
    And turn yourself about

    Here we go loop de loop
    Here we go loop de lie
    Here we go loop de loop
    All on a Saturday night

    You put your whole self in
    You take your whole self out
    You give yourself a shake, shake, shake
    And turn yourself about
     
  9. PurpHaze

    PurpHaze LawnSite Fanatic
    Posts: 5,496

    Yup... Very older form of prevention. I've got some sheep intestines available for my next sexual encounter. :laugh: Wait... The wife has had her plumbing removed so I'll sell it to someone cheap. :)

    I can just imagine driving through his neighborhood after he convinces all his neighbors to put in barometric loops the proper height. Quite a scene I'd bet seeing all these loops above the house. :dizzy:
     
  10. PurpHaze

    PurpHaze LawnSite Fanatic
    Posts: 5,496

    Sick sense of humor. You'll fit right in here. :laugh:
     

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