ISS question

Is it not pressurised with nitrogen theough, Presumably some sensorr looks
at the various proportions and decides one is getting low.
You say everything leaks, and they are very careful not to let the amonia
get into station. As I understood it, its a two stage system, amonia outside
and water inside with heat exchangers etc. If that is the case one would
have thought that some crystaline deposits from leaking Amonia would be
seen.


Brian

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"Bob Myers" wrote in message
...
On 4/8/2010 1:55 PM, Pat Flannery wrote:
I note that tomorrow they will be EVAing to replace a ammonia tank on the
ISS which is supposed to be "depleted".
This is the second or third time this has been done on the station.
I know the ISS uses the ammonia for its cooling system radiators, but how
exactly is the ammonia getting depleted?
Does the cooling system leak, or does the ammonia deteriorate with use
and need to be replaced? I can see adding more as new modules are added,
but when this happens they say the old tank is empty.

Everything leaks. The only question is "how fast?," always.

Bob M.