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Author
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Topic: A13: CO2 levels & O2 supply
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Paul78zephyr
Member Posts: 678
From: Hudson, MA
Registered: Jul 2005
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posted 03-29-2007 12:00 PM
  
Im sitting here looking at a pile of 5 books that I own: The History of Manned Space Flight (Baker), Thirteen: The Flight That Failed (Cooper), Apollo 13 - The NASA Mission Reports (Apogee), Lost Moon (Lovell/Kluger), Apollo EECOM - Journey Of A Lifetime (Liebergot). No two tell the A13 story EXACTLY the same way. Im not critisizing, just an observation.My specific A13 question is about the CO2 levels and lithium hydroxide canister issues. All sources agree that fairly early on in the crisis is was determined that - ironically - the one consumable that was NOT is short supply was oxygen (for breathing). So when CO2 levels began to climb, and they ran out of LM LIOH (not sure this is the correct shorthand)canisters, why didnt they just bleed off some of the 'saturated' cabin atmosphere and replace it with new O2? Then they would not have had to do that whole thing with the 'mailbox' (LIOH adapter). Thanks,
Paul |
LCDR Scott Schneeweis
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posted 03-29-2007 12:39 PM
Only 20 percent power remained on the LM using the modified LIOH filtration. Assuming sufficient volumetric O2 reserves were available to completely refill the cabin one/multiple times (not the same thing as providing make-up O2 feeds to an already pressurized cabin) my guess is there would be adverse ramifications for LM power and thermal management if a single (or possibly multiple) purges were required to maintain CO2 below toxicity levels..the Cabin Heat exchanger would have to work a lot harder to warm the larger volume of gas introduced as a resulto of a complete cabin purge/refill..
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Scott Schneeweis
URL http://www.SPACEAHOLIC.com/ |
Steve Procter
Member Posts: 1031
From: Leeds, Yorkshire, UK
Registered: Oct 2000
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posted 03-29-2007 02:26 PM
Where are you Sy? Sounds like one for you!Steve |
Sy Liebergot
Member Posts: 501
From: Pearland, Texas USA
Registered: May 2003
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posted 03-29-2007 04:04 PM
Y'all need to do your own research. It's all out there on the internet. Go to the Apollo 13 Mission Operations Report: http://www.hq.nasa.gov/alsj/a13/A13_MissionOpReport.pdf in Appendix G LM TELMU. A cabin purge was not considered--not when we had plenty of CM LiOH canisters and plenty of time to kluge a way to use them.
Sy |
Paul78zephyr
Member Posts: 678
From: Hudson, MA
Registered: Jul 2005
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posted 04-02-2007 12:14 PM
In reading thru the entire Apollo 13 NASA Mission Report including the A13 Accident Review Board Report I find it fascinating that a SPECIFIC recommendation was NOT made to unify the LIOH canister designs in the CM and LM for future flights.I guess I dont understand (admittedly) and therefore I also find it quite remarkable that although the LOX in O2 tank 2 was at 800+ psi for the CDDT (as it would be in flight) the internal damage to the filler/vent lines prevented it from being emptied but that it was felt that addition heating would 'force' it out (this is the so-called 'special' de-tanking that was done at KSC after the CDDT and prior to launch). I mean either the vent tubes would allow venting or they would not. How does heating help if 800+ psi is not enough? This 'special' de-tanking was totally improvised at the time and was so far outside the normal operation of the O2 tank I still cant believe no one - including Lovell himself - said 'stop, this is way out of the norm'... Paul |
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