ISS O2 questions?

Craig Fink wrote:

What percentage of the airlock air (O2 and N2) is recovered when the
airlock is depressurized? The percentage that is pumped back into the
Space Station before the vents are opened to the vacuum?


From the TD9702.PDF (station familiarisation manual):

As the C/L is depressed down to 3 psi, the Depress Pump in the airlock
is used to reclaim 70-80 percent of the cabin atmosphere. The rest of
the atmosphere (3 psi down to vacuum) is vented to space through
the Manual Pressure Equalization Valve (MPEV) on the EVA hatch.

....

Since some of the pumps/compressors were supplied by Russia, I assume
that the Russian airlock has similar properties.

The big question is what happens in 2010 when the US segment's ECLSS
will no longer be functional and EVAs from Quest no longer possible
since there will be nothing to refill the Quest tanks.

Will HTV be equipped to supply O2 and N2 through the CBM ? Has the CBM
to which HTV will be berthed been equipped with the proper plumbing in
the node to allow O2 and N2 flow, or was only the CBM where PMA2 was
planned (on Destiny and on Node2's forward port) been so equipped ?

Is there still time to modify Node2 before it is launched so that it
would have the proper plumbing to allow HTV to have the ability to
refull the Quest tanks ?

Has NASA published a real/credible non political document that explains
how it expects its side of the station to continue to function with
shuttle permanently grounded in 2010 ? Or will the station be forced to
return to barebones operation with only 2 crewmembers (like now) and no
EVAs from US side because the US segment will not have a functioning
ECLSS system ?

On Sat, 21 May 2005 19:24:01 -0400, John Doe wrote:

Craig Fink wrote:

What percentage of the airlock air (O2 and N2) is recovered when the
airlock is depressurized? The percentage that is pumped back into the
Space Station before the vents are opened to the vacuum?


From the TD9702.PDF (station familiarisation manual):

http://vesuvius.jsc.nasa.gov/er/seh/td9702.pdf

Thanks.


As the C/L is depressed down to 3 psi, the Depress Pump in the airlock
is used to reclaim 70-80 percent of the cabin atmosphere. The rest of
the atmosphere (3 psi down to vacuum) is vented to space through
the Manual Pressure Equalization Valve (MPEV) on the EVA hatch.


Do you think NASA would let me hook up to the vent? As long as I bring the
pressure down at a reasonable rate? Who would be the right person at NASA
to talk to about connecting to the airlock vent?

...

Since some of the pumps/compressors were supplied by Russia, I assume
that the Russian airlock has similar properties.

Humm, scratches head, wondering what the Russian airlock does with the
air?

--
Craig Fink
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