Timeline for Why is the EMU space suit pressurized to 4.3 psi specifically?
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
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| Jan 5, 2016 at 20:19 | comment | added | Phil_12d3 | Thanks for finding the right paragraph. I thought it was in there but couldn't find it and didn't want to put something in the answer without being sure. Glad it helped. | |
| Jan 5, 2016 at 18:57 | vote | accept | Nakedible | ||
| Jan 5, 2016 at 18:57 | comment | added | Nakedible | The above paragraph seems to directly give the answer why exactly 4.3 psi (flammability risk in cabin + DCS risk in suit), which is exactly what I was looking for. The answer also validates my math, so I am very happy. | |
| Jan 5, 2016 at 18:48 | comment | added | Nakedible | Thank you! Excellent resource! Found by Google: "The solution was instituting a reduction of cabin pressure from the normal 14.7 psia (1 atm) to 10.2 psia (70.4 kPa) 24 hours before an EVA and an increase in the EMU operating pressure to 4.3 psi (30 kPa). The EMU pressure had to be raised by this small amount to assure an acceptably low risk of DCS. The cabin pressure couldn't be reduced any further than 10.2 psia (70.4 kPa) due to flammability concerns arising from the reduction of nitrogen, assuring that no less than about 3.08 psi (21.2 kPa) of oxygen was available for breathing. | |
| Jan 5, 2016 at 16:06 | history | answered | Phil_12d3 | CC BY-SA 3.0 |