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psi loss

Ryan Wistisen
Ryan Wistisen Member Posts: 1
in THE MAIN WALL
In a tank type water heater what is the water psi loss? I have been searching all over the web and other sources and have not been able to find anything. If anyone knows the answer or has an equation that I could use that would be very helpful.

Comments

  • Brad White
    Brad White Member Posts: 2,399
    Piddling

    The real losses through most tanks are borne by the inlet and outlet nozzle conditions. Cameron's Hydraulic Data has some figures for you. Naturally this is a function of flow and velocity and if the inlet is sharp or rounded/reamed.

    Don't forget the drop tube either.
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"



    -Ernie White, my Dad
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928


    The dip tube is [likely] the greatest source of loss as it's often somewhat smaller in diameter than the connection size. Even then, losses will likely be negligible in a typical residential system as I've never seen a tank water heater with smaller than 3/4" connections and a dip tube with [about] 5/8" internal diameter. A typical residence has a 5/8" meter, a 3/4" - 1" entrance and 1/2" - 3/4" main domestic piping. Until quite recently, both the domestic cold and domestic hot would be in 1/2". 3/4" for both has become common, but given that standard 5/8" meter it's almost pointless...

    Again, in a well-designed system, the tank water heater will not add any appreciable pressure drop--that's why you're having a hard time finding--it's inconsequential to begin with...

This discussion has been closed.

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