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AP is reporting a mystery air pressure drop on ISS
AP is reporting a mystery air pressure drop on ISS. Details to follow.
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#2
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AP is reporting a mystery air pressure drop on ISS
In article , JimO wrote:
AP is reporting a mystery air pressure drop on ISS. Details to follow. Several places picked it up so far that I can see: http://abcnews.go.com/wire/US/ap20040105_1654.html http://www.usatoday.com/news/nation/...-station_x.htm http://www.chron.com/cs/CDA/ssistory.mpl/space/2336976 (and many more - all seem to be the same AP story) From today's (well, yesterday's) status report: "U.S. and Russian specialists are investigating a slight drop in total cabin air pressure, which was first noted on 12/29 and has now stabilized at 731-732 mmHg after as total drop of 11 mmHg.**[While total pressure is directly measured, ppN2 (nitrogen partial pressure) cannot be determined by instrument readings but is commonly calculated (with known ppO2).* The apparent decrease in nitrogen is as yet unexplained and under investigation.]" It may be worth noting that 11 mmHg is about the same as the ambient differences in pressure between different modules of the station, if I'm reading http://www.spaceref.com/news/viewsr.html?pid=11379 correctly. -- -Andrew Gray |
#3
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AP is reporting a mystery air pressure drop on ISS
Well, Foale's luck is nothing if not consistent.
JJ Robinson II Houston, TX **************** * JOKE * **************** * SERIOUS * **************** * SARCASTIC * **************** * OTHER? * **************** "JimO" wrote in message ... AP is reporting a mystery air pressure drop on ISS. Details to follow. |
#4
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AP is reporting a mystery air pressure drop on ISS
Andrew Gray wrote:
In article , JimO wrote: AP is reporting a mystery air pressure drop on ISS. Details to follow. Several places picked it up so far that I can see: http://abcnews.go.com/wire/US/ap20040105_1654.html http://www.usatoday.com/news/nation/...-station_x.htm http://www.chron.com/cs/CDA/ssistory.mpl/space/2336976 (and many more - all seem to be the same AP story) From today's (well, yesterday's) status report: "U.S. and Russian specialists are investigating a slight drop in total cabin air pressure, which was first noted on 12/29 and has now stabilized at 731-732 mmHg after as total drop of 11 mmHg.**[While total pressure is directly measured, ppN2 (nitrogen partial pressure) cannot be determined by instrument readings but is commonly calculated (with known ppO2).* The apparent decrease in nitrogen is as yet unexplained and under investigation.]" It may be worth noting that 11 mmHg is about the same as the ambient differences in pressure between different modules of the station, if I'm reading http://www.spaceref.com/news/viewsr.html?pid=11379 correctly. Or, could it be that some of the pressure sensors in various modules aren't calibrated properly (or some are located in the air handling system) and the pressure in all the modules is essentially the same. This way the astronauts won't have to brave storm force winds when moving from compartment to compartment. So, when they are talking about a pressure loss in the space station of 11 mmHg, they are talking about an 11 mmHg drop in all the pressure sensors in the various modules. Not some minor variation (much less than 11mmHg) caused by the airconditioner. Let see, dyanmic pressure equal 11 mmHg or 0.2 psi * 144 lbs/in2 = 28.8 lbs/ft2 = 1/2 density * velocity ^ 2, Density = .075 lbs/ft3, so velocity = 27 fps. or 30 kph of wind blowing between modules. I don't think so. Craig Fink |
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Michael Foale, hard luck astrodude
"hrtbreak" wrote in news:W9rKb.72
: AP is reporting a mystery air pressure drop on ISS. Details to follow. Well, Foale's luck is nothing if not consistent. That was my first thought, too. Let's see if he also ends up here racing through the ISS "putting out fires," so to speak. |
#6
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AP is reporting a mystery air pressure drop on ISS
Andrew Gray wrote:
In article , JimO wrote: AP is reporting a mystery air pressure drop on ISS. Details to follow. Several places picked it up so far that I can see: http://abcnews.go.com/wire/US/ap20040105_1654.html http://www.usatoday.com/news/nation/...-station_x.htm http://www.chron.com/cs/CDA/ssistory.mpl/space/2336976 (and many more - all seem to be the same AP story) From today's (well, yesterday's) status report: "U.S. and Russian specialists are investigating a slight drop in total cabin air pressure, which was first noted on 12/29 and has now stabilized at 731-732 mmHg after as total drop of 11 mmHg.**[While total pressure is directly measured, ppN2 (nitrogen partial pressure) cannot be determined by instrument readings but is commonly calculated (with known ppO2).* The apparent decrease in nitrogen is as yet unexplained and under investigation.]" It may be worth noting that 11 mmHg is about the same as the ambient differences in pressure between different modules of the station, if I'm reading http://www.spaceref.com/news/viewsr.html?pid=11379 correctly. I've been looking at the fine print at the end of several of the status reports; the FGB has been about 10 mmHg above the other sections. Also, the 2003.12.31 report had normal looking pressures, compared to 12.28 and 12.22. /dps |
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AP is reporting a mystery air pressure drop on ISS
What is the device they are using to locate the leak? Could mix up a batch
of super soap and blow some super bubbles to observe micro changes in air density. -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#8
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AP is reporting a mystery air pressure drop on ISS
Aren't they supposed to use Dr. Pepper (tm) or something?
JJ Robinson II Houston, TX **************** * JOKE * **************** * SERIOUS * **************** * SARCASTIC * **************** * OTHER? * **************** "Lynndel Humphreys" wrote in message ... What is the device they are using to locate the leak? Could mix up a batch of super soap and blow some super bubbles to observe micro changes in air density. -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#9
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Michael Foale, hard luck astrodude
Gary D wrote in message ...
"hrtbreak" wrote in news:W9rKb.72 : AP is reporting a mystery air pressure drop on ISS. Details to follow. Well, Foale's luck is nothing if not consistent. That was my first thought, too. Let's see if he also ends up here racing through the ISS "putting out fires," so to speak. News today is that Mr. Foale found the leak. He is the best troubleshooter currently in all of outer space. - Ed Kyle |
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