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Re: Cylinders (gas)

> From: "Frank I. Reiter" <FIR at istar_ca>
> Subject: Re: dangers of a pressurized gas cylinder?
> If you have watched the input pressure to your regulator over time you may
> have noticed that the pressure in your tank stays constant until it is nearly
> empty.  The reason for this is that CO2 is bottled at a pressure which keeps
> it in liquid form  When a little CO2 is used from the bottle the pressure
> drops and liquid CO2 turns to gas until the equilibrium pressure is reached
> again.
> If your bottle is not vertical you run the risk of forcing liquid CO2 into the
> regulator.

	Right.  You don't want the liquid CO2 in the regulator.
> All of the above applies equally to pressurized oxygen 

	Oxygen in cylinders is in gaseous form.  Using the cylinders
in a horizontal position is O.K..  

> and acetylene as well

	Acletylene is stored dissolved in a liquid.  You definitely do
not want _that_ going into the regulator, because it won't evaporate
when the pressure is released from it.  Acetylene is dangerous stuff,
because it isn't overly stable itself, never mind the flammability

> btw, though the equilibrium pressure is different for each.

	Neither the oxygen nor the acetylene will have a constant
pressure phase as the gas is used up.

Paul Sears        Ottawa, Canada