Forum Discussion

aruba5er's avatar
aruba5er
Explorer
Apr 28, 2013

Propane pressure at tank.

I know the propane system runs at 11" ( about 1/2#) but does anyone know the pressure at the tank. Some dirty little mice took a liking to my hose from the tank to the regulator and chewed the outer rubber off. I need to replace it and have some hoses off a gas grill but it is marked 1# and the hose on the camper is marked 350#. I know the pressure is NOT 350 but what IS it? If more than 1# I'll have to buy a hose, but If not I can save a few bucks. Thanks. And please, no lectures about how dangerous propane is and how I might blow up and all that stuff. I know, having served a 2 year pipe fitting apprenticeship.
  • ktmrfs's avatar
    ktmrfs
    Explorer II
    Apr 28, 2013
    wgriswold wrote:
    The pressure varies with temperature. At 30 deg F it is about 50 psi and at 100 deg it is about 180 psi.


    that's at the propane temp, not necessarily ambient since the propane temp drops as it boils at about -40F as you draw off the vapor. So tank pressure varies all over the map depending on draw rate, temps etc. The tank will vent if pressures get to high, but don't know what that pressure is.

    One reason for using a two stage regulator is to get a more constant outlet pressure over the wide variation of tank pressure. First stage regulates to an intermediate pressure, the second stage then regulates down to the final roughly 1/2 psi.
  • wgriswold's avatar
    wgriswold
    Explorer
    Apr 28, 2013
    The pressure varies with temperature. At 30 deg F it is about 50 psi and at 100 deg it is about 180 psi.

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