Blow air through PVB?

Discussion in 'Irrigation' started by johnboy37, Jul 30, 2011.

  1. mitchgo

    mitchgo LawnSite Silver Member
    Posts: 2,767

    What does a pack flow preventor do then?

    It prevents a cross contamination between potable and non potable water

    It is Cross Contamination because the piping is directly connected with eachother
     
  2. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,762

    That's typical east coast b.s. :hammerhead:
     
  3. mitchgo

    mitchgo LawnSite Silver Member
    Posts: 2,767

    ugh.. what ever I don't really care. I'm going back outside
     
  4. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,885

    the phrase is "cross-connection" and no others need apply
     
  5. mitchgo

    mitchgo LawnSite Silver Member
    Posts: 2,767

    connection contamination tomato tomato!

    so you wanted to start all of this because my word wasn't entirely accurate? While the whole time you knew what I was implying?
     
  6. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,885

    Don't imply anything. Get it right. The Washington State thinking is almost beyond parsing, according to what has been posted here, since the prohibition on upstream water connections would also prohibit the testcocks on the backflow preventer itself.

    There are some building codes that look for a vacuum breaker on any hose bib on the potable water supply, and that has merit, because some fool might try to fill a jar with arsenic and spray weeds, or something similarly brilliant.
     
  7. mitchgo

    mitchgo LawnSite Silver Member
    Posts: 2,767

    Hey I didn't say I agree with it. I just follow the codes, I didn't write them

    and I don't represent washington.. I represent no one except for my self

    your right.. I meant to say connection not contamination.. I don't know what I was thinkin.. Wrong word.. My bad.. Alll hell has now broken loose
     
    Last edited: Jul 30, 2011
  8. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,762

    Complete b.s., Boots. We testers follow a code that includes WA, OR, CAL and BC. If you think we're paranoid about cross-connection, you're right because we take our responsibility very seriously. Go troll another site :hammerhead:
     
  9. johnboy37

    johnboy37 LawnSite Member
    from Mass
    Posts: 3

    Thanks for the responses guys - seems like it is worth it for me to spend the $10 in parts and the 15 minutes before I bury the mainline to cut in a tee with a valve and a mpt adaptor to hook up the air to.
     
  10. DanaMac

    DanaMac LawnSite Fanatic
    Posts: 13,156

    The best way is to blow out from a connection down stream of any backflow preventer. But we blew out through the PVB or RP on probably 700 of the 900 we did last year. Do it right, and you won't have a problem. it's not my preferred method, but I won't be able to convince the other 700 to change their set up when it's been done this way for years. And no way I would have time to change them all during the blow out season.

    if we are doing freeze damage repairs in the spring for a customer, we add a tee in there for blowing out.
     

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