RPZ Minimizing Pressure Loss

Discussion in 'Irrigation' started by dypsisdean, Sep 4, 2010.

  1. dypsisdean

    dypsisdean LawnSite Member
    from Hawaii
    Posts: 38

    Thanks for the well wishes. And sorry you couldn't enjoy the 3D. It does take a "newer" computer with a fairly decent video card. But there are many other pics there to get an idea of how obsessed botanists and fanatical plant collectors can become. Even to the extent of moving to the slope of an active volcano in the middle of the ocean to pursue their passion. :)
     
  2. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,339

    i only have 1 eye!!!!:laugh::laugh::laugh::laugh::laugh::laugh::laugh:



    i kill me :laugh::laugh:
     
  3. dypsisdean

    dypsisdean LawnSite Member
    from Hawaii
    Posts: 38

    For real??? Seriously

    If that avatar is really you, you could've had a lead part in "Tombstone."
     
  4. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,381

    (don't remind him of his avatar, since a remake of True Grit is in the works)
    We get to give you the big razzoo because of a failure on your part to do the essential measuring required to consult technical data on pressure loss. Don't wear your typing fingers out trying to explain the failure. Just accept it as failure and move on.

    Elevations don't mean diddlysquat when it comes to friction losses in pipes and valves - it's all about flow, and flow is going to be determined by the sprinklers being used. For the money, it looks like a rework of heads and zones to me, even if all the above-ground plumbing has to be discarded because it won't endure higher pressures.
     
    Last edited: Sep 6, 2010
  5. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,339

    for real................. that's john wayne in the avatar though.

    3D won't work without stereo vision, silly


    i still kill me:laugh::laugh::laugh:
     
  6. mitchgo

    mitchgo LawnSite Silver Member
    Posts: 2,774

    Amen!

    Like I said, for the amount you have spent on plants and water you should have done the irrigation system right.

    Install the RP and deal with it.
     
  7. rlpsystems

    rlpsystems LawnSite Senior Member
    Posts: 471

    I watched the marathon "Swamp People" last night. Makes me wanna go limb line a gator.
     
  8. dypsisdean

    dypsisdean LawnSite Member
    from Hawaii
    Posts: 38

    I don't mind a big razzoo for omitting what you feel was crucial for the present sprinkler design. But to insinuate that it's a result of stupidity is another matter. What you still fail to understand is that in the original installation the flow, pressure, etc. meant nothing to me. I had very limited pipe choices here in the middle of the Pacific, and a given pressure/flow to work with. The goal was maximum coverage on each zone - period. So all I had to do was keep adding heads until a couldn't add any more. The pressure and flow were irrelevant. I either had a zone with 10, 15, or 20 sprinklers. Knowing all the precious variables wouldn't have changed a thing. That's a pretty straight forward simple concept that needed no math at all.

    And your evaluation of head and elevations is lacking. The difference between pool and sprinkler design is that we care more about head and flow. Pressure is something to be avoided. We try and reduce pressure as much as possible, while increasing flow. It is easier on seals, filters, etc. But the effect of head (specifically elevation changes) on flow and pressure is significant, and every elbow, ft. of head is included in any sizing equations, mainly because of differences in pump performance as it relates to head.

    Think of it this way. Come out of your meter and go straight up a 100 ft cliff and see how many sprinklers you can run. Then come out of your meter and go straight down a 100 ft. cliff and see how many you can run. I think you would be very surprised, despite what any figuring on paper that you do. Or to carry an example even farther, if you came out of a meter with relatively low pressure to begin with, you may not even be able to push any water up a steep long cliff, but actually pick up pressure going down a long steep cliff. My elevations were purely estimates. The delta could be as much as 150 ft. So again, all the equations I looked at did not really provide for what I have come to respect as a very real variable that you seem to discount.
     
    Last edited: Sep 6, 2010
  9. mitchgo

    mitchgo LawnSite Silver Member
    Posts: 2,774

    I'm baffled on how you are able to write a book every time you post.

    Dude, get over your self... You have to install the rp so deal with it.
    Congratulations on having a basic understand of water hydraulics. Have fun with your main eventually bursting because of the high flow rates. Don't cry to us when you get your $10,000 water bill.
     
  10. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,912

    This thread is about over, most of you have given the guy WAY more information than he deserved and he has struck back like it was some kind of dog fight. Throw it out, move on.
     

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