Long Wheel Base Posted January 7, 2020 Share If it went off under my saddle I will have something in my pants, but it won't be KOMI wonder how loud the bang would be?Many years ago before the days of tubeless I was out riding my MTB. Got a puncture near a garage so changed my tube there. I didn't notice that I actually had a slice in the sidewall. I was busy pumping my tyre with the garage air and hadn't noticed the tube bulging out. Next second there was a massive bang. The poor petrol attendants all dropped and lay on the ground. My toppie and I got such a fright, I honestly thought a bomb had gone off. BigDL, PhilipV, Mamil and 1 other 4 Link to comment Share on other sites More sharing options...
The Ouzo Posted January 7, 2020 Share I wonder how loud the bang would be?Many years ago before the days of tubeless I was out riding my MTB. Got a puncture near a garage so changed my tube there. I didn't notice that I actually had a slice in the sidewall. I was busy pumping my tyre with the garage air and hadn't noticed the tube bulging out. Next second there was a massive bang. The poor petrol attendants all dropped and lay on the ground. My toppie and I got such a fright, I honestly thought a bomb had gone off.had a similar thing happen with my wifes mtb. We were still dating at the time and I was changing her mtb tyres to slicks in their lounge.Busy inflating the tyre with a track pump and didnt notice i had pinched the tube, huge bang and every lose ornament shook. Mamil 1 Link to comment Share on other sites More sharing options...
Bateleur1 Posted January 7, 2020 Share If that went off under my saddle maybe I'd get the KOM .... ... after your balls of course. Wannabe and Mamil 2 Link to comment Share on other sites More sharing options...
Straight Line Posted January 7, 2020 Share Seeing that this is the first (so far) incident like this in what must be huge numbers of CO2 bombs incorrectly stored over many years, it's probably a chance in a million. But it's a warning. Check this link for the warning in writing:  https://storage.googleapis.com/slime-com/uploads/20277_CO2_Inflator_Instructions.pdf   Link to comment Share on other sites More sharing options...
Shebeen Posted January 7, 2020 Share Liquid CO2 doesn't exist at normal atmospheric pressure. There is no temperature where it remains liquid - it will always turn into either a solid or a gas.As you might also remember from chem, the freezing and boiling points of substances changes with pressure. http://upload.wikimedia.org/wikipedia/commons/thumb/1/13/Carbon_dioxide_pressure-temperature_phase_diagram.svg/636px-Carbon_dioxide_pressure-temperature_phase_diagram.svg.png As you increase the pressure on CO2, the boiling point moves away from the freezing point creating a gap for liquid to exist.Another interesting fact about CO2 (and similar volatile non-polar liquids) is that the pressure in a container, so long as it is not depleted (with no liquid left) or overloaded, is determined entirely by temperature, and not how much CO2 is in it. A CO2 tank at room temperature is at about 850 PSI, no matter if it is full of half empty.Now, for the scary part, pressure increase is logarithmic with temperature. A 2x increase in the temperature of a CO2 tank results in a 10x increase in pressure, and above about 91F CO2 really doesn't want to be a liquid anymore no matter the pressure (The critical point). It's about this time when a release valve would go off if your tank was big enough to need one. Luckily small CO2 cylinders are incredibly over engineered for what they do, so you're still pretty safe.  (as you can see from the farhenheit, i swiped this from here - https://www.bikeforums.net/bicycle-mechanics/743958-can-co2-cartridges-explode-3.html) where I also found this i'm guessing there was some fault with the cartridge, a car cubbyhole should never get that hot BigDL 1 Link to comment Share on other sites More sharing options...
MrJacques Posted January 7, 2020 Share had a similar thing happen with my wifes mtb. We were still dating at the time and I was changing her mtb tyres to slicks in their lounge.Busy inflating the tyre with a track pump and didnt notice i had pinched the tube, huge bang and every lose ornament shook. Sorta related, what happens when a tubeless setup goes wrong: https://www.pinkbike.com/video/509984/ Edited January 7, 2020 by Jacquers BigDL and Mamil 2 Link to comment Share on other sites More sharing options...
Stretched@Birth Posted January 7, 2020 Share I wonder how loud the bang would be?Many years ago before the days of tubeless I was out riding my MTB. Got a puncture near a garage so changed my tube there. I didn't notice that I actually had a slice in the sidewall. I was busy pumping my tyre with the garage air and hadn't noticed the tube bulging out. Next second there was a massive bang. The poor petrol attendants all dropped and lay on the ground. My toppie and I got such a fright, I honestly thought a bomb had gone off.We were racing the criterium in Boksburg many years ago. One of my friends had finished racing, so my old man packed her bike into the kombi. It was raining, so my mom was sitting in the kombi, when the tyre exploded (hp clinchers pumped to 100 PSI) the ringing in her ears lasted for a week or 2! Long Wheel Base and BigDL 2 Link to comment Share on other sites More sharing options...
nathrix Posted January 7, 2020 Share From now on I'm riding with a pompie in my pocket after seeing this Link to comment Share on other sites More sharing options...
Vetseun Posted January 7, 2020 Share I wonder is the industry is regulated in any way. These things could be very dangerous.I had two bombs last year that were empty. Like nothing it. BigDL 1 Link to comment Share on other sites More sharing options...
Fat Boab Posted January 7, 2020 Share What makes you think the gas is liquified? Liquid CO2 doesn't exist at normal atmospheric pressure. There is no temperature where it remains liquid - it will always turn into either a solid or a gas. As you might also remember from chem, the freezing and boiling points of substances changes with pressure. http://upload.wikimedia.org/wikipedia/commons/thumb/1/13/Carbon_dioxide_pressure-temperature_phase_diagram.svg/636px-Carbon_dioxide_pressure-temperature_phase_diagram.svg.png As you increase the pressure on CO2, the boiling point moves away from the freezing point creating a gap for liquid to exist. Another interesting fact about CO2 (and similar volatile non-polar liquids) is that the pressure in a container, so long as it is not depleted (with no liquid left) or overloaded, is determined entirely by temperature, and not how much CO2 is in it. A CO2 tank at room temperature is at about 850 PSI, no matter if it is full of half empty. Now, for the scary part, pressure increase is logarithmic with temperature. A 2x increase in the temperature of a CO2 tank results in a 10x increase in pressure, and above about 91F CO2 really doesn't want to be a liquid anymore no matter the pressure (The critical point). It's about this time when a release valve would go off if your tank was big enough to need one. Luckily small CO2 cylinders are incredibly over engineered for what they do, so you're still pretty safe.  (as you can see from the farhenheit, i swiped this from here - https://www.bikeforums.net/bicycle-mechanics/743958-can-co2-cartridges-explode-3.html) where I also found thishttps://youtu.be/pL0n3DbInKYi'm guessing there was some fault with the cartridge, a car cubbyhole should never get that hot Link to comment Share on other sites More sharing options...
BaGearA Posted January 7, 2020 Share What makes you think the gas is liquified?  At 32c and below at higher than 76psi co2 is usually A liquid Link to comment Share on other sites More sharing options...
PhilipV Posted January 7, 2020 Share I've heard a sodastream bottle popping off in the back of a bakkie's canopy in summer. I can't remember if there was scrapnel damage, but I do remember the huge bang. BigDL 1 Link to comment Share on other sites More sharing options...
Fat Boab Posted January 7, 2020 Share Plot that T and P on the phase chart. Well in the gas zone. Your suggestion would mean your bombed tyres are full of liquid on a summers day... At 32c and below at higher than 76psi co2 is usually A liquid Edited January 7, 2020 by Fat Boab Link to comment Share on other sites More sharing options...
BaGearA Posted January 7, 2020 Share Plot that T and P on the phase chart. Well in the gas zone. Your suggestion would mean your bombed tyres are full of liquid on a summers day... that assuming ideal conditions , the space in your tyre obviously has a big influence Link to comment Share on other sites More sharing options...
BaGearA Posted January 7, 2020 Share I think main thing here is as mentioned before , there's probably no standard on how these things get made and to what tolerance/resolution ect ect. and that's where i might get hard to distinguish between if heat/poor manufacturing is to blame for these explosions  but id bet it's probably around 1 out of every 100 000 bombs that go boom if that much even BigDL 1 Link to comment Share on other sites More sharing options...
DieselnDust Posted January 7, 2020 Share I think main thing here is as mentioned before , there's probably no standard on how these things get made and to what tolerance/resolution ect ect. and that's where i might get hard to distinguish between if heat/poor manufacturing is to blame for these explosions  but id bet it's probably around 1 out of every 100 000 bombs that go boom if that much even   I think these canisters are used in other domestic and industrial applications so they should be made to an international standard. Ill sift through the IHS library and find it. Link to comment Share on other sites More sharing options...
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