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#1
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Apollo: One gas environment?
Were all the Apollo flights made in a one-gas (pure oxygen)
environment? It seems that the thin skin of the LM made it necessary to limit the cabin pressure to 3.5 psi and required a one-gas system. Is this correct? |
#2
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"Bill" wrote in message ... Were all the Apollo flights made in a one-gas (pure oxygen) environment? It seems that the thin skin of the LM made it necessary to limit the cabin pressure to 3.5 psi and required a one-gas system. Is this correct? Yes. |
#3
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"Rocky Top" wrote in message news:NmEkc.10917$5a.962@okepread03... "Bill" wrote in message ... Were all the Apollo flights made in a one-gas (pure oxygen) environment? It seems that the thin skin of the LM made it necessary to limit the cabin pressure to 3.5 psi and required a one-gas system. Is this correct? Yes. To detail a bit more. All took off with a mixed gas atmosphere (N2 and O2) at I believe 1 atmosphere pressure. The N2 was bled off until the they reached the partial pressure of the O2 was left. |
#4
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In article ,
Bill wrote: Were all the Apollo flights made in a one-gas (pure oxygen) environment? It seems that the thin skin of the LM made it necessary to limit the cabin pressure to 3.5 psi and required a one-gas system. That, plus the need to do spacewalks without lengthy prebreathing, plus the much greater complexity of two-gas life-support systems. Post-fire, Apollo used 60% oxygen 40% nitrogen as the *cabin* atmosphere on the pad, but the crew always breathed pure oxygen, and the cabin shifted to pure oxygen during ascent. -- MOST launched 30 June; science observations running | Henry Spencer since Oct; first surprises seen; papers pending. | |
#6
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In article ,
Doug... wrote: In article , says... In article , Bill wrote: Were all the Apollo flights made in a one-gas (pure oxygen) environment? It seems that the thin skin of the LM made it necessary to limit the cabin pressure to 3.5 psi and required a one-gas system. Post-fire, Apollo used 60% oxygen 40% nitrogen as the *cabin* atmosphere on the pad, but the crew always breathed pure oxygen, and the cabin shifted to pure oxygen during ascent. Pre-Fire, of course, the cabin was pressurized to roughly 17 psia of pure oxygen. They also overpressurized the cabin at times during post- Fire operations, but as Henry says, the air was 40% nitrogen. I'm sure I'm not the only one who had to look this up, not knowing what a psi is equivalent to. I'm sure everyone knows that 1 atmosphere = 101.3 kPA ... but many of us forget that this equals 14.7 psi So they pressurised to 1.16 atmospheres (117.2 kPa) and then dropped to 0.24 atm (24.1 kPa). Nick |
#7
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On 5/1/04 6:42 AM, in article , "Nicholas
Fitzpatrick" wrote: I'm sure I'm not the only one who had to look this up, not knowing what a psi is equivalent to. I'm sure everyone knows that 1 atmosphere = 101.3 kPA ... but many of us forget that this equals 14.7 psi We do? Gee, *I* got through 4th grade science! Brett |
#8
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In article ,
Brett Buck wrote: On 5/1/04 6:42 AM, in article , "Nicholas Fitzpatrick" wrote: I'm sure I'm not the only one who had to look this up, not knowing what a psi is equivalent to. I'm sure everyone knows that 1 atmosphere = 101.3 kPA ... but many of us forget that this equals 14.7 psi We do? Gee, *I* got through 4th grade science! Well, I certainly do ... and I thought that others might not be familiar enough with Imperial units to do it without looking it up, so I thought I would simply pass on what I had just looked up, to help anyone else. Only trying to help. Don't see why this has to be a flame-war ... outside of the USA, there are few people who would have much familiarity with those units ... and I thought NASA now had deemed that all their subcontractors had to use metric units now, after that Mars accident. Personally, I got through engineering without having to do much in psi .. certainly saw enough kPa ... and the Imperial stuff I saw was all in atmospheres. (though I certainly learned where to find the conversion necessary when I need it ... I just never use it enough to have any feel for it intuitively ... but then I can never master Farenheight either, and I see that frequently enough ... always have to convert it to something I can get my head around. When I watch the weather, they always give you pressures in kPa around here ... and my recollection being in the States that that they don't use psi during a weather forecast either ... Nick |
#9
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"Nicholas Fitzpatrick" So they pressurised to 1.16 atmospheres (117.2 kPa) and then dropped to 0.24 atm (24.1 kPa). Yeah well it makes just as much sense to say they kept about a 3.5 psi of positive pressure..... |
#10
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I agree.
For a normal person it is almost impossible to understand all these interesting topics when it is full of gallons, feets and psi's instead of litres, meters and Pascals I'm sure I'm not the only one who had to look this up, not knowing what a psi is equivalent to. I'm sure everyone knows that 1 atmosphere = 101.3 kPA ... but many of us forget that this equals 14.7 psi So they pressurised to 1.16 atmospheres (117.2 kPa) and then dropped to 0.24 atm (24.1 kPa). Nick |
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