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On Fri, 19 Apr 1996, Alan B. Chapman wrote:
> The only other thing that I can think of as far as emptying your tank on
> an airlineris this. In a normal situation your tank is holding 200 bar,
> there is 1 bar of pressure outside of your tank making the ratio of
> internal pressure to external pressure 200:1. In flight your tank is
> still holding 200 bar but the external pressure may be as low as 0.5 bar
> making the ratio 400:1. You cannot concern yourself only with the tank
> pressure but you must also consider the external pressure on the tank. I
> am not sure if this is a valid concern but it seems the most likely
> problem to me.
I,m affraid, that you are wrong, presure is not relative, for example
NASA suits in space, inside only 1 bar, but outside - 0.0......1bar,
ratio is going to infinity, but pressure is just 1 bar (1kg/1cm^2)
outside presure | inside presure
1 bar --> | <--------
|
200 bar
|
0 bar | <--------
|
Difference ? at first draw part of 'inside presure' is equalized by
'outs.' at second isn't as you see its just simple 1bar difference. It
means, thatC at the sufrace forces of presure are: 200-1kg/cm^2 in plane
they are: 200-0.5kg/cm^2
As you see, incres of risk is very small but..... multiple this risk by
200 passangers.
Piotr Potulski
Ps. sorry for my poor english, but unfortunetly I'm not native speaker
_______________________________________________________________________
Piotr Potulski potulski@cc*.un*.to*.pl*
University of Torun, Poland
Institute fo underwater archaeology
_______________________________________________________________________
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