Re: [PSUBS-MAILIST] Crazy idea.

[Ian Roxborough <irox@ix.netcom.com>]

Hi Bill,

some research has been done on this idea.  But they are two main
differences between what you describe and the research I've read.
First is that rather than use a horse shoe shaped stiffener, the
stiffener has been made out of either a complete tube (i.e. toroid),
or a longer tube coiled around the inside of the pressure vessel.
The second change is that rather than exposing the inside of the
tube to external pressure, they are pressurized to several times
higher than the external pressure.

The book "Pressure Vessels - external pressure Technology" by Carl
T. F. Ross, discusses tube stiffened pressure vessels on page 286.
Later on (page 321) there is an experiment using a tube stiffened
dome in a pressure test tank.  The tubing was pressurized to 13bar
and the fail pressure of the dome was 3bar.

The advantage of the tube stiffened pressure-vessels is that if you
increase the internal tube pressure, you increase the crush depth.

Anyway, it works, it has been done in laboratory conditions, but
I do not know of a non-test tube stiffened pressure-vessel.

Cheers,
  Ian.


On Sat, 14 May 2005 08:25:13 -0400
"Akins" <lakins1@tampabay.rr.com> wrote:

> Hi forum.
> 
> I just had a craaaazy idea. This just jumped into my head and I wonder if anyone has ever tried it or any research done on it.
> 
> Suspose you had a pressure hull with horseshoe shaped tubes penetrating the hull all over its entire surface. Then suspose the water
> 
> entered into the open ended OUTSIDE of those tubes and the tubes were welded where they penetrated the hull and also against the inside of the hull facing outward so the outside
> 
> water pressure enters the open end and is now pushing OUTWARD against the inside of your hull. Would this work to counteract some of the inward pressure on
> 
> the hull?  I was thinking of a way to use water pressure to counteract itself by taking its inward pushing pressure and curving back outward against the inside of your pressure hull by use of horseshoe shaped tubes.
> 
> Or am I missing something basic again about pressure?
> 
> Kindest Regards,
> 
> Bill Akins. 



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