A Space & astronomy forum. SpaceBanter.com

Go Back   Home » SpaceBanter.com forum » Space Science » Space Station
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

AP is reporting a mystery air pressure drop on ISS



 
 
Thread Tools Display Modes
  #1  
Old January 6th 04, 12:50 AM
JimO
external usenet poster
 
Posts: n/a
Default AP is reporting a mystery air pressure drop on ISS

AP is reporting a mystery air pressure drop on ISS. Details to follow.


  #2  
Old January 6th 04, 01:40 AM
Andrew Gray
external usenet poster
 
Posts: n/a
Default 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  
Old January 6th 04, 05:52 AM
hrtbreak
external usenet poster
 
Posts: n/a
Default 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  
Old January 6th 04, 12:27 PM
Craig Fink
external usenet poster
 
Posts: n/a
Default 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

  #5  
Old January 6th 04, 09:45 PM
Gary D
external usenet poster
 
Posts: n/a
Default 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  
Old January 7th 04, 03:56 AM
dave schneider
external usenet poster
 
Posts: n/a
Default 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
  #7  
Old January 8th 04, 08:00 PM
Lynndel Humphreys
external usenet poster
 
Posts: n/a
Default 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  
Old January 8th 04, 08:39 PM
hrtbreak
external usenet poster
 
Posts: n/a
Default 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  
Old January 11th 04, 11:00 PM
ed kyle
external usenet poster
 
Posts: n/a
Default 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
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Three Questions for Challenger's 18th Anniversary john_thomas_maxson Space Shuttle 88 February 21st 04 02:32 AM
Pressure monitoring in station BigSkier Space Station 2 December 1st 03 05:19 PM
ISS On-Orbit Status, 22-10-2003 Jacques van Oene Space Station 0 October 23rd 03 09:56 AM
51-L RCS Valve Commands *Not* Checked John Maxson Space Shuttle 82 September 1st 03 03:40 PM
Gunter's Mystery Sat #11 Gunter Krebs Space Science Misc 0 July 22nd 03 05:00 AM


All times are GMT +1. The time now is 11:30 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 SpaceBanter.com.
The comments are property of their posters.