Timeline for Why are emergency inflation cartridges filled with CO2?
Current License: CC BY-SA 4.0
23 events
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| Sep 15, 2018 at 19:54 | history | edited | Argenti Apparatus | CC BY-SA 4.0 |
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| Sep 17, 2017 at 1:01 | comment | added | Daniel R Hicks | CO2 is not inert. If one should have fancy-dancy magnesium rims there is a non-trivial chance that one could have a near explosion in some sort of accident or collision that ruptured the wheel and threw sparks. | |
| Sep 16, 2017 at 13:33 | comment | added | Argenti Apparatus | @NPSF3000 - true, I made an edit. | |
| Sep 16, 2017 at 13:31 | history | edited | Argenti Apparatus | CC BY-SA 3.0 |
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| Sep 16, 2017 at 2:45 | comment | added | NPSF3000 | "CO2 is inert and therefore safe in a fire" Sure, CO2 isn't flammable... but exposing any pressurized container to fire is usually considered a bad idea. | |
| Sep 15, 2017 at 23:04 | comment | added | Kevin Krumwiede | @Paparazzi Well, I don't know what to tell you. I challenge you to find a single source that backs up your claim. I think you're confusing CO2's vapor pressure at its triple point (-56.6C) with its vapor pressure at room temperature. | |
| S Sep 15, 2017 at 20:36 | history | suggested | Braiam | CC BY-SA 3.0 |
Why 0? There's no C-zero-O
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| Sep 15, 2017 at 20:21 | review | Suggested edits | |||
| S Sep 15, 2017 at 20:36 | |||||
| Sep 14, 2017 at 23:38 | comment | added | Perkins | @KevinKrumwiede And we use CO2 for these purposes instead of nitrogen because the 800-900 psi room temperature vapor pressure of CO2 is extremely manageable while the 60,000-70,000 psi vapor pressure of LN2 very definitely is not. | |
| Sep 14, 2017 at 22:28 | comment | added | Kevin Krumwiede | @Paparazzi "As long as a CO2 cylinder is at a reasonable, constant temperature, as gas is (slowly) used out of the cylinder liquid CO2 'boils' off as gaseous CO2, at the vapor pressure of CO2 at that temperature. This is about 860 psi at normal room temperature, or about 72 degrees Fahrenheit. This process of evaporation continues until all the liquid CO2 is gone." Link Many other sources give similar figures. | |
| Sep 14, 2017 at 22:23 | comment | added | paparazzo | @KevinKrumwiede Not buying | |
| Sep 14, 2017 at 20:55 | comment | added | Kevin Krumwiede | CO2 turning into a liquid at a relatively low pressure gives it a sort of self-regulating effect. The pressure of the gas on top of the liquid remains steady until the liquid is gone. This doesn't directly explain why they're used for tires, but it explains why they're used in airguns, which is what made them cheap and plentiful for other uses. | |
| Sep 14, 2017 at 20:51 | comment | added | Kevin Krumwiede | @Paparazzi The gas pressure in CO2 cartridges is about 60 atmospheres, depending on temperature. | |
| Sep 14, 2017 at 16:06 | comment | added | Mr.Wizard | FWIW this says In almost all cases, carbon dioxide which is captured and purified for commercial applications would be vented to the atmosphere at the production point if it was not recovered for transport and beneficial use at other locations. (Regarding point #3 parenthetical.) | |
| Sep 14, 2017 at 14:58 | comment | added | Chris H | Similar CO2 cartridges have a long history for carbonating drinks as well, for which other gases don't work (soda syphon cartridges) | |
| Sep 14, 2017 at 14:16 | comment | added | paparazzo | @Tooniis The cartridge handles about 5 atmosphere. That is not enough air to inflate a tire. | |
| Sep 14, 2017 at 13:04 | comment | added | mikes | There is also the issue of the water vapor in compressed air freezing when the container is depressurized. | |
| Sep 14, 2017 at 12:46 | comment | added | Argenti Apparatus | But my guesses are that much higher pressures have to be reached to get oxygen or nitrogen to liquify, and water vapor has to be removed | |
| Sep 14, 2017 at 12:42 | comment | added | Argenti Apparatus | Obviously using atmospheric air is unsuitable, as we don't see any 'canned' pressurized air products (think cans of compressed gas for removing dust from keyboards, which are actually filled with refrigerant) perhaps you should ask this question in the Physics Stack Exchange site. | |
| Sep 14, 2017 at 12:28 | comment | added | compton | As the current state of climate engineering indicates, not easy to extract from the atmosphere at scale. (That would make it one of the mythical "negative emission technologies", which don't exist but which still form the basis of many climate modelling scenarios on which the Paris Agreement is based.) | |
| Sep 14, 2017 at 12:13 | comment | added | Tooniis | 1,2 and 4 are good reasons, but is making CO2 cheaper than powering air compressors to compress air into the cartridges? | |
| Sep 14, 2017 at 11:43 | history | edited | Argenti Apparatus | CC BY-SA 3.0 |
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| Sep 14, 2017 at 11:21 | history | answered | Argenti Apparatus | CC BY-SA 3.0 |