I think you have to remember that water as a liquid to all intents and
purposes is not commpressible. As the lubricator fills with water the
oil has to depart down the line as it is the only place it can go.
Water as steam is compressible and that is where the oil sneaks past.
It is also why one needs to keep the body of a displacement lubricator
as 'cool' as possible to aid the condensation process. Finally in a
deadleg system it also helps if the pipe into the lube slopes down
slightly once inside the body. A pal of mine and longtime Ga 1 loco
maker found out that if on the level or slight up slope the water can
prefer to run back down the pipe rather than into the lubricator.
Sam E
Geoff Spenceley wrote:
>
> Gary, Sorry, Your following statement is not correct: ">Geoff, and
> others, Oil floats on water that is the only "pressure " needed. The whole
> system is under the same
> >pressure" It IS NOT!.
>
> I will reply to you off sslivesteam. Pip, Pip
>
> Geoff.
>
> geoff.Harry, but we are talking about a pressurized
> >>system and the water won't just "push" the oil into the steam line--there
> >>MUST be a pressure differential! Certainly the water displaces the oil, (
> >>thus a displacement lubricator)-
> >
> >Geoff, and others, Oil floats on water that is the only "presure " needed.
> >The whole system is under the same
> >pressure so where can the differential come from?. Take a small glass tube
> >closed at the bottom, fill it half with
> >oil. Fill the other half with water... Watch what happens. Oil rises to
> >the top,keep pouring water in and in time
> >the oil will be gone with water remaining. This will happen in an open
> >atmosphere or a closed system under
> >pressure.
> >
> >Gary
>
>
