Plumbing a pressure relief valve

Discussion in 'Pumps and Tanks Well Forum & Blog. Water is life.' started by banjo bud, Oct 13, 2018.

  1. banjo bud

    banjo bud Member

    Joined:
    Sep 24, 2018
    Location:
    South Carolina
    i know the best way plumb one is to run the output into a drain or outside. Neither of those will be easy in any way in my situation. I’m thinking if they blow, (and what are the chances?) there can’t be that much water spewed out before it closes again. So I’m wondering if I can just route the output to a convenient spot in my crawl space. Or into a permanently placed bucket near the pump.
     
  2. Boycedrilling

    Boycedrilling In the Trades

    Joined:
    Sep 30, 2013
    Location:
    Royal City, WA
    No, it’s going to put out a bunch of water. Say you’re on a 40-60 pressure switch and you have a 75 psi relief valve. What’s going to cause the system to go to 75 psi? A welded pressure switch. It’s not going to shut down.
     
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  4. banjo bud

    banjo bud Member

    Joined:
    Sep 24, 2018
    Location:
    South Carolina
    Is that common?
     
  5. ThirdGenPump

    ThirdGenPump In the Trades

    Joined:
    Apr 8, 2016
    Location:
    MA
    Depends on the size of the pump and potential for damage.

    On a regular domestic system it's rare to plumb the relief valve anywhere, it just gets aimed down in front of the pressure tank. logic is it's better it dumps water on the basement floor than blows up a random pipe in a wall somewhere. If the pump stays over pressure it will continue to dump water there.

    On larger systems I always hard pipe them outside, preferably to a location someone will notice.
     
  6. banjo bud

    banjo bud Member

    Joined:
    Sep 24, 2018
    Location:
    South Carolina
    It’s a 1/2 HP shallow well pump.
     
  7. Boycedrilling

    Boycedrilling In the Trades

    Joined:
    Sep 30, 2013
    Location:
    Royal City, WA
    Plumbing code says to plumb a relief valve to a floor drain or outside. Does that actually get done? Not very often.
     
  8. valveman

    valveman Cary Austin Staff Member

    Joined:
    Mar 15, 2006
    Occupation:
    Pump Controls Technician
    Location:
    Lubbock, Texas
    99% of the time you will get away with it. But the 1% that has a prv pop off will certainly not like the flood it causes.
     
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