How are the SGOGs these days? NASA isn't saying....

Daily reports can be found at 'NASA WATCH' at
http://www.spaceref.com/iss/issnews.html?mid=115

Notice that the last three on-orbit status reports no longer provide
accounting of SFOG statistics re how many duds they
have encountered and how many days of supplies they have
left versus the arrival of the next Progress.

Can't we presume that if it were GOOD news that we'd be
reading it? grin Of course, the sample size is small
and it might only be a reporting problem for now -- but let's
keep a close watch on this.
---------
Footnote: I figure the station's internal volume contains
at least a full month of 'oxygen buffer' if ALL the supply
systems were to fail or be exhausted. Here's my math
(I'd appreciate anybody doing a reality-check):

1 cubic meter of air weighs 1.3 kg



ISS pressurized volume = 15,000 ft3 = 425 m3, = 550 kg,

of which 110 kg is oxygen.



altitude vs air pressure values:

0 km 0 ft 1.00

3 km 10,000 ft 0.70

5.5km 18,000 ft 0.50

11km 36000 ft 0.250



One man consumes 0.85 kg of O2 per day, 2 men 1.7 kg.



To use up 30% of o2 (33 kg), reaching 10,000 ft elevation

equivalent, would take about 20 days. Another two weeks

and they'd be at 18,000 ft elevation equivalent and

start really getting worried.

Word is, the omission is just a paperwork hangup and that the
'dud rate' is dropping as the newer ones in the pantry get
utilized.

"Jim Oberg" wrote
Daily reports can be found at 'NASA WATCH' at
http://www.spaceref.com/iss/issnews.html?mid=115

Notice that the last three on-orbit status reports no longer provide
accounting of SFOG statistics re how many duds they
have encountered and how many days of supplies they have
left versus the arrival of the next Progress.

Can't we presume that if it were GOOD news that we'd be
reading it? grin Of course, the sample size is small
and it might only be a reporting problem for now -- but let's
keep a close watch on this.
---------
Footnote: I figure the station's internal volume contains
at least a full month of 'oxygen buffer' if ALL the supply
systems were to fail or be exhausted. Here's my math
(I'd appreciate anybody doing a reality-check):

1 cubic meter of air weighs 1.3 kg



ISS pressurized volume = 15,000 ft3 = 425 m3, = 550 kg,

of which 110 kg is oxygen.



altitude vs air pressure values:

0 km 0 ft 1.00

3 km 10,000 ft 0.70

5.5km 18,000 ft 0.50

11km 36000 ft 0.250



One man consumes 0.85 kg of O2 per day, 2 men 1.7 kg.



To use up 30% of o2 (33 kg), reaching 10,000 ft elevation

equivalent, would take about 20 days. Another two weeks

and they'd be at 18,000 ft elevation equivalent and

start really getting worried.