Re: [APD] Re: Aquatic-Plants Digest, Vol 18, Issue 7

[Chris Hotte <ecwh at cogeco_ca>]

S. Hieber wrote:

> The frosting is from the rapid escape of the presurised
> contents and doesn't really have much to do with the tank's
> orientation.
>
> sh
>
> > I had around 300lbs left in my tank, so I took of the
> > regulator and let 
> > 'er rip. The bottom half of the tank frosted. From a dead
> > sleep my two 
> > cats ran out of the house like bats outta hell from the
> > noise. 
> >
> > Whee waaah.
> >
> > Chris.
Well, actually I believe it would. The frost line yes, is a direct 
result of the depressurization. The tank was left in the standing 
position and depressurized. The frost line appered from the liquid line 
and crept downward with it until the tank was empty, which makes sense. 
If the tank was upside down and the valve opened, the same would happen, 
but the frost line would move outward, towards the empty side of the 
container as the gas escapes. I do believe that liquid C02 might jet out 
of the valve however.

So the effect is the same, there's just this notion of "right side up" 
that we have to contend with and is giving us all this trouble. If the 
tank were on it's 'side', valve 'upward' and pressure released, the 
frost line would appear horizontally across the tank and move 'down' 
until empty.

So what kind of valve is used in space? The tank contents (if liquid) 
wouldn't conform to one side of the tank opposite the valve.

- Chris.
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