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pressure relief orientation

curious_6 Member Posts: 1
As far as I can recall, all the 30psi boiler pressure relief valves I've come across have specified vertical installation. putting it directly in the boiler without any valves etc I can understand, but why must it be vertical? Somthing to do with sediment? I ask because I have a water heater being used as a buffer tank where I would like to replace the T&P valve in the side tapping with a 30psi pressure relief.


  • A.J.
    A.J. Member Posts: 257
    relief valve

    Code requires that the safety valve be in the vertical position because some manufactures make safety valves that have a floating seat that could lodge sideways in the valve if it should happen to discharge from that position.
  • curious_7
    curious_7 Member Posts: 2
    I see...

    There's usually a good reason for these things. Would it be kosher to put the valve in a side tapping with a short nipple and a 90 to make it vertical? Now it's on the top of the tank on a tee, but I'd really like to put an air vent there instead.
  • kevin coppinger_4
    kevin coppinger_4 Member Posts: 2,124
    are we talking...

    about Pressure relif valves OR Temperature AND Pressure relif valves...big diff. I agree about PR valves upright. T&P valves must be totaly w/in the top 6" of the water heater tank...

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  • curious_7
    curious_7 Member Posts: 2
    pressure only

    It is strictly a low temp buffer tank - the heating elements have been removed. I just mentioned a T&P valve since they can be installed horizontally.
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