Pressure for blowouts

Discussion in 'Irrigation' started by cjohn2000, Nov 1, 2012.

  1. cjohn2000

    cjohn2000 LawnSite Senior Member
    Messages: 570

    We got four lawn crews to do that. More like hardscapes and lighting in my future
  2. 1idejim

    1idejim LawnSite Fanatic
    Messages: 11,358

    2 serious questions Z.

    what'd you tow the 900 with? All of the 500cfms i have been around were truck mounted for ease of travel. Hauling or towing one here requires a cdl.

    How do you design a system around a compressor for blowouts? I thought a design was based on hydraulics.
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  3. zimmatic

    zimmatic LawnSite Senior Member
    Messages: 416

    I used a f350. The compressor was on a 3 axle trailer with brakes.

    Installed heavier walled pvc pipe Class 200 for main line vs 160. along with multiple isolation valves.
  4. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,764

    160, as in PVC, or 160, as in poly?
  5. 1idejim

    1idejim LawnSite Fanatic
    Messages: 11,358

    Living in the state of jefferson i had never heard of blow outs and i really don't understand them completely. I understand that there is a poc for the hose but where do you decide to connect to on a cold call? Indication of when its done? Is everything regional?

    Like every other thread i have read, i should be able to tred water long enough to get a grasp.
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  6. cjohn2000

    cjohn2000 LawnSite Senior Member
    Messages: 570

    Depends usually I will poke around the doublecheck for an iso or a quick coupler. Other than that #4 testcock. On larger systems we cut in a nipple with a cap. As far as when its done I look for last head spewing water wait for a single puff and on to the next. Pretty easy, as well as surprising, to tell how the pipe is generally routed.
  7. mitchgo

    mitchgo LawnSite Silver Member
    Messages: 2,957

    That wouldn't fly in the residential world. Typically I wait until it stops spitting water. This is all still within a general 1-3 min per zone time frame
  8. cjohn2000

    cjohn2000 LawnSite Senior Member
    Messages: 570

    Depends on what the rest of the zone is doing. But what I mentioned is frustrating on long runs fed from one end especially when its clogged (should have been put out of its misery) bed heads on crooked riser pipes
  9. Mike Leary

    Mike Leary LawnSite Fanatic
    Messages: 23,174

    You don't want a "dry blow", a misting means "done". When I first started, my teacher taught me to burp the zones once more, but, over the years, I found no reason if the system was winterized correctly.
  10. cjohn2000

    cjohn2000 LawnSite Senior Member
    Messages: 570

    Especially with water lubricated gear driven rotors. Never seen one fail after blow out.

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