Foam Inside Tank?

So I see what you are saying is even with the same amount of foam inside the
sheet metal (whaver the tanks are made out of) is still probably would
condense and freeze water, right? so is the foam (my only plausable
experience is a coozi popcan holder) has a durable vynl coating, or else
where it is worn off holds a lot of condensation. I assume since the foam
is not covered it is now (at time of launch) full of ice and or water?


Andromeda et Julie enlightened us with:
--
Gareth Slee

Better: A system like one used in building isolation. It's a
sandwich system with the foam between two sheets of metal.

the security problem is not the foam itself but the ice building

"Greg D. Moore \" ) writes:
"Ian Stirling" wrote in message
...
TC wrote:
Jonathan Silverlight wrote:
In message , Gareth
Slee writes
Any reason why the foam cannot be *inside* the fuel tank?

Because if anything came off, for any reason, it would go into the
SSME? I suspect that could spoil your whole day.

Liquid oxygen soaked into an organic material is an explosive.
So any internal insulation in the oxygen tank would have to
be non-organic.

In principle, you could immerse the LO2 tank in the LH2 tank, and insulate
the outside of the LO2 tank.

You know, that's an idea I don't think I've seen before. It's interesting
if nothing else.

Serious question Could the greater cold of the LH over-chill the LO2 ?

Andre


--
" I'm a man... But, I can change... If I have to... I guess. "
The Man Prayer, Red Green.

Plowboy a écrit :
So I see what you are saying is even with the same amount of foam inside the
sheet metal (whaver the tanks are made out of) is still probably would
condense and freeze water, right?

yes , probably less water would condense inside the foam because of
lesser air circulation

however, the external surface could be quickly covered by ice in some
places ( hard to control!) because liquid H2 and 02 are really cold !

and this ice would absolutely surely detach during launch !

so it s "better" to have frozen foam that normally holds than ice that
fall anyway

this problem is quite tricky in fact , we see , because of the extreme
stresses (vibrations, extreme noise, supersonic transition during
flight..) shows that even the best glues (and they are strong !) can
fail

they announced that they hope to fix the problem of foam deteching from
ET before end of the year

what is sad in this is that , any solution for this kind of problem ,
how smart and efficient it looks, would actually need flight
validation

and then , next flight may see some piece detach again ... and ...
never ending story