Blowout port, What is your prefered/installed method...

Discussion in 'Irrigation' started by grassman177, Nov 5, 2013.

  1. grassman177

    grassman177 LawnSite Fanatic
    Messages: 9,795

    As the title reads, we all have many dif systems we work on from many dif installers over many decades. Do you have a certain port you prefer is installed for blowouts? This goes for any port that has the backflow installed indoors with the blowout outside either above, or below ground in valve box etc.

    Ill go first, Above ground, I prefer a copper line above grade, with a T going to 3/4 in male threads/cap. I see very few of these)

    I hate 1/2in pvc caps, in a 6in valve box, 8in deep on pvc pipe
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,373

    3/4 male garden hose threads - nothing else need apply - boiler drains on every install
  3. irritation

    irritation LawnSite Gold Member
    Messages: 3,577

    Boiler drain is good because you can leave it open in case the main shutoff drips. I like to remove them for blow out though because they do restrict the air on larger systems. 3/4" threads.
  4. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,373

    There are boiler drains and there are boiler drains. Before modern cheapos, no real air restriction (think Nibco and Lee) ~ Nibco moved production to Mexico, but if you splurge on a 'Classic' boiler drain from Nibco, you get wide open air passage, not to mention better flow on shutoff drips.
  5. irritation

    irritation LawnSite Gold Member
    Messages: 3,577

    Only takes a minute to remove one. Boiler drains and quick couplers are not meant for blow out ports.
  6. Cape Atlantic Landscaping

    Cape Atlantic Landscaping LawnSite Member
    Messages: 37

    We have three main ways to hook up to a system for winterization
    1. 3/4 boiler installed after back flow
    2. Strait piece of pipe screwed into 3/4 inch threaded T
    3. Quick connect yellow topped Plasson
    We see all three of these plus a lot of 1/2 Threaded tees with plugs in them.
    In our Island communities. A lot of systems are connected to a separate water meter in the curb and we must crack the meter nut on the outside of the connection to blow out completely
  7. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,373

    a good boiler drain passes 100+ cfm no problem. If I wanted something more wide open, there are quick couplers with hose swivels, or a simple 3/4 mpt x gh adapter threaded into a full port valve.
  8. 1idejim

    1idejim LawnSite Fanatic
    Messages: 11,288

    How does air compare with water when performing blowouts? I mean you are at odds on the poc for the blowouts and it must be fairly critical if you guys disagree on spigots and boiler drains. How much air are you pushing, what pressure and how do you tell the temperature of the air and is any of this that important?

    By the way how many gallons are in a cubic foot of air. :waving:
    Posted via Mobile Device
  9. Sprinkler Buddy

    Sprinkler Buddy LawnSite Bronze Member
    from Florida
    Messages: 1,185

    Duke, you always make me laugh.

    "By the way how many gallons are in a cubic foot of air."
  10. zman9119

    zman9119 LawnSite Senior Member
    Messages: 852

    We do not have any issues with types of boiler drains that are installed and are used for winterizations. We use what we can to get the job done in one trip and if we have to change something, the crews put it in the notes to change for next year. They do not have time to screw around with swapping out items. Plus, we run into 2 issues: Either the boiler drain was soldered on after the RPZ or we have a 3/4" or 1/2" F.A. with a plug after the RPZ since installing a boiler drain is now against code here.

    Air Pressure on the gauge on the compressor

    Air Pressure on the gauge on the discharge connection

    Air Pressure on the air compressor discharge manifold

    Air compressor discharge air temperature (after running about 15 minutes)

    Temperature, just like pressure, is important to us and we keep and eye on it to ensure it does not get that warm.

    As for how many gallons in a cubic foot of air? If you are talking about compressed air it should be 88.9 gallons.

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