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Pressure for blowouts

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

  1. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,429

    When I only had testcock access to connect the air, I sometimes had to amp up the pressure to get enough air input to raise and seal the PVB poppet.
     
  2. cjohn2000

    cjohn2000 LawnSite Senior Member
    Posts: 552

    At my old job 1" air line up to 75' and we blew out some 2" dblchks through the #4 testcock. New job one of those skinny air hoses probably 25'.
     
  3. greenmonster304

    greenmonster304 LawnSite Gold Member
    Posts: 3,013

    That is over kill I use 1/4 blank drip tube. It works fine.
    Posted via Mobile Device
     
  4. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,429

    That would explain the high pressure, since the air hose takes it away. If all your systems are small, a small air supply would get things done (eventually)

    Do you have to schlep the compressor out of the van/truck and roll it up to a connection point?
     
  5. bx24

    bx24 LawnSite Senior Member
    from MA/TX
    Posts: 503

    Too funny...I still use a Sears Craftsman 30 gallon air compressor @ a SCFM 90 psi: 5.1 SCFM. Always works fine for my 3,000 feet of pipe in my yard. Longest main is 500+ ft long @ 1.250 inch dia...

    Point is, most blowouts are a money maker for a biz (go figure and should be). And yes I am was in the Biz and do it on the side for people...
     
  6. cjohn2000

    cjohn2000 LawnSite Senior Member
    Posts: 552

    Most of the time I can pull up near it and run the skinny hose to the backflow. I have had to unload it only a couple of times. Next year we will have a tow behind. I have been running it at about 75 to 90 and sometimes I have to stop to let the compressor catch up PITA.
     
  7. Mdirrigation

    Mdirrigation LawnSite Silver Member
    Posts: 2,455

    well the down fall to the tow behind is that you are paid by the hour , so now it takes so long with the little toy compressor , with the tow behind you will be on unemployment that much sooner
     
  8. cjohn2000

    cjohn2000 LawnSite Senior Member
    Posts: 552

    unemployment? lol, I just put in 9 hours today, I have been doing blow outs outside of what we normally do, One here one there.
     
  9. Mdirrigation

    Mdirrigation LawnSite Silver Member
    Posts: 2,455

    how many blowouts are you doing a day with the little compressor? How long to do each ?
     
  10. cjohn2000

    cjohn2000 LawnSite Senior Member
    Posts: 552

    It depends most of the time I do one at the end of the day. Alot of them I have to call and schedule to get access to the controller in the garage. Usually 8 per day but that the leftovers that are scattered about between cities. As far as time it takes longer because sometimes I will shut the zone off to build a little more pressure or wait for a minute between zones. Tow behinds rule!!!
     

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