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Cardiovorax posted:Funny, I'd have expected it to feel differently. Know how when you hold your breath you get that burning feeling after a while? That's because your lungs measure the CO2 content of the air they contain to know when you need to breathe, they can't actually tell how much oxygen is left in it. It's why you can breathe out and then hold your breath a little bit longer than before and why breathing something else, like nitrogen, doesn't make you feel like you're asphyxiating. I would've thought it'd be more like that. Yeah, it is my understanding that being overcome by CO2 is excruciating because it triggers a powerful primitive panic response in the core of the brain, whereas pretty much any other kind of inert gas asphyxiation makes you fade out. The CO2 panic response is one of the reasons why inhaling carbogen gas is supposed to be a profoundly powerful experience. Carbogen has easily more than enough oxygen than you need, but it has so much CO2 in it that your brain and body completely flip out.
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Aug 13, 2014 15:28
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Cardiovorax posted:Funny, I'd have expected it to feel differently. Know how when you hold your breath you get that burning feeling after a while? That's because your lungs measure the CO2 content of the air they contain to know when you need to breathe, they can't actually tell how much oxygen is left in it. It's why you can breathe out and then hold your breath a little bit longer than before and why breathing something else, like nitrogen, doesn't make you feel like you're asphyxiating. I would've thought it'd be more like that. Your lungs don't actually do that, your chemoreceptors for CO2 are in the brainstem. The lungs themselves are just an interface for external respiration (gas exchange with the outside world). Some people with some types of bad lung disease which results in their being unable to maintain normal CO2 via increased ventilatory drive just because mechanically their lungs are made of poo poo and garbage are thought to regulate their breathing via 'hypoxic drive' instead, using peripheral oxygen chemoreceptors found in the aortic and carotid body. They'd essentially learn to ignore CO2 and instead of getting that crazy panic feeling just get something called CO2 narcosis where they basically pass out and die unless we increase their ventilation via horrible machines. e: sorry for the 
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Aug 13, 2014 15:44
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FrozenVent posted:People still use HALON? I thought everyone had moved on to CO2 or that fancy poo poo by now. You do not want to be in the room when the CO2 system goes off. You will die. Reading page 5, go to the end, saw this: quote:Lessons Learned WELL GEE THANKS! and then scrolled to the next page
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Aug 13, 2014 15:50
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VelociBacon posted:Your lungs don't actually do that, your chemoreceptors for CO2 are in the brainstem. The lungs themselves are just an interface for external respiration (gas exchange with the outside world). is cool, no need to apologize. I really should have remembered that, I know it was part of one of my biochem classes.
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Aug 13, 2014 15:53
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spog posted:I couldn't do it. gently caress, I closed the tab after two seconds. Nope.
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Aug 13, 2014 16:00
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Mr. Despair posted:Not at all. Average O2 in the air is ~21%, 17% is where you start to notice effects, 16% your reaction time is doubled, 15% and you start to lose muscle control, 10-12% you can lose consciousness. These aren't the same values everywhere (if you're at sea level you can tend to get away with lower O2 levels because your lungs are more efficient in higher pressures, but it's not something you gently caress around with and assume it's ok. Depending on what's burning you might need to get 02 levels down to 16% at a minimum, some things will need 12% to stop burning. That's not how halon systems work. They don't put out fires by reducing the concentration of oxygen, they actually participate in and poison the chemical reaction, by scavenging the free radicals that propagate it. Even at just a few % by volume concentrations, they can knock down fires, and typical concentrations in flooding systems are only 7%. The do-not-enter isn't because of asphyxiation, it's because at those concentrations the gas can get you high, which isn't what you want in a fire, and because the decomposition byproducts can include hydrobromic acid.
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Aug 13, 2014 16:46
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Fajita Fiesta posted:https://www.youtube.com/watch?v=Lft51kJdDxc This man is a glorious idiot and shold be encouraged in everything. Like making a jet bike https://www.youtube.com/watch?v=D1EHZPjLNHk
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Aug 13, 2014 17:04
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We had a halon dump at my work once when someone in the Medical Records department hit the wrong switch during a fire drill. It turned out to be a paperwork nightmare for everyone involved and we almost got fined by Environment Canada for not having replaced the halon system with something else (Sapphire?) years ago. Staff in that area were complaining of dizziness, nausea, coughing, etc., for weeks after that. Apparently none of those are symptoms of halon exposure. They also claimed that the halon had left a residue on everything and they didn't feel safe working. It was dust.
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Aug 13, 2014 18:34
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VelociBacon posted:Your lungs don't actually do that, your chemoreceptors for CO2 are in the brainstem. The lungs themselves are just an interface for external respiration (gas exchange with the outside world). In my younger days, some friends mistakenly bought CO2 cartridges rather than NO2 cartridges to do whip-its with. We all realized the error before anyone tried to do one, but I, being the reckless but curious nihilist that I was in those days, decided to try one out. I remember the experience as being surprisingly mild. I recall taking a big lungful of CO2, and just feeling like my lungs were full and no longer interested in doing much of anything. I held it for a brief time, then forced my lungs to clear, and started breathing normally again.
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Aug 13, 2014 21:38
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CaptainSarcastic posted:In my younger days, some friends mistakenly bought CO2 cartridges rather than NO2 cartridges to do whip-its with. We all realized the error before anyone tried to do one, but I, being the reckless but curious nihilist that I was in those days, decided to try one out. I remember the experience as being surprisingly mild. I recall taking a big lungful of CO2, and just feeling like my lungs were full and no longer interested in doing much of anything. I held it for a brief time, then forced my lungs to clear, and started breathing normally again. Yeah one breath of CO2 wouldn't be much worse than just holding your breath I guess.
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Aug 13, 2014 21:42
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KernelSlanders posted:Whatever this is? Thanks to this I now know there is a 10 hour long "air raid siren" clip on youtube. Gonna turn this up all the way, leave for for work, and show the cat who's loving boss. https://www.youtube.com/watch?v=rIos0ya-yss
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Aug 13, 2014 22:11
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Poldarn posted:Staff in that area were complaining of dizziness, nausea, coughing, etc., for weeks after that. Apparently none of those are symptoms of halon exposure. They also claimed that the halon had left a residue on everything and they didn't feel safe working. It was dust. Yeah if I recall correctly from the shipboard firefighting stuff I did years ago, accidental discharges of halon (i.e. there's no fire) are totally harmless. All the bad stuff happens as a result of the high temperature.
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Aug 13, 2014 22:49
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FrozenVent posted:CO2 release =/= fire. In theory it has to be manually activated, but there's a reason the alarm switches are in the pipes, not linked to the triggers. Ohhhh I get it now. An oh poo poo button of sorts. Related: fire suppression is an interesting field.
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Aug 13, 2014 23:03
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CharlieWhiskey posted:A hundred Sunyears after the Old Ones scorched the skies, the young shaman stumbles again into the cave with the warm metal. With his father's war wedge, he breaks off shards of the warm metal and plans to turn it into magic belt buckles for the whole tribe, as instructed by the Old Ones' pictograms, showing how you should place the magic material on your abdomen for best effect. By Obamma's tears, this might be the trick to get the chieftan's daughter pregnant. If that works, it might even bring the water and crops back.
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Aug 13, 2014 23:10
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Phanatic posted:That's not how halon systems work. They don't put out fires by reducing the concentration of oxygen, they actually participate in and poison the chemical reaction, by scavenging the free radicals that propagate it. Even at just a few % by volume concentrations, they can knock down fires, and typical concentrations in flooding systems are only 7%. Hydrobromic acid and carbonyl fluoride, the latter of which is something that manages to combine the worst aspects of hydrofluoric acid and phosgene.
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Aug 14, 2014 00:22
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Aug 14, 2014 02:05
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How the gently caress else did they think that would end?
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Aug 14, 2014 02:37
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I don't get it. That is quite clearly a vehicle that has been cut in half. Isn't what's going on there basically intentional? oh yeah also Fajita Fiesta posted:https://www.youtube.com/watch?v=Lft51kJdDxc Yeah I've had Colinfurze' channel bookmarked for years. Just go ahead and watch every one of his videos. Leperflesh fucked around with this message at 03:10 on Aug 14, 2014 |
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Aug 14, 2014 03:08
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Leperflesh posted:I don't get it. That is quite clearly a vehicle that has been cut in half. Isn't what's going on there basically intentional? It looks like it just snapped. I think the cab's typically wholly separate from the bed even for regular little pick-ups.
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Aug 14, 2014 03:20
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SirDan3k posted:How the gently caress else did they think that would end? What is leverage and fulcrums? 
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Aug 14, 2014 03:23
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"Dur it's a truck and trucks are sturdy work vehicles see if we slam the back of it into ice and yank up on the front of it it's fine because physics is a lie"
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Aug 14, 2014 04:21
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https://www.youtube.com/watch?v=XKjN0Bw61e8 So a buddy of mine builds jet engines for a hobby, built a pretty big one that produces a giant fuckoff amount of fire, then starts it with a leafblower. Where couple of weeks back he made a remotecontrol leafblower just so this wouldn't happen. He ended up with a couple of second and first degree burns.
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Aug 14, 2014 04:36
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and that's where cooper minis come from
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Aug 14, 2014 04:43
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Cardiovorax posted:Funny, I'd have expected it to feel differently. Know how when you hold your breath you get that burning feeling after a while? That's because your lungs measure the CO2 content of the air they contain to know when you need to breathe, they can't actually tell how much oxygen is left in it. It's why you can breathe out and then hold your breath a little bit longer than before and why breathing something else, like nitrogen, doesn't make you feel like you're asphyxiating. I would've thought it'd be more like that.
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Aug 14, 2014 05:01
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Guys, stop trying to huff noxious gasses.
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Aug 14, 2014 05:10
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Stop narcing, narc.
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Aug 14, 2014 05:15
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Hypha posted:Guys, stop trying to huff noxious gasses.
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Aug 14, 2014 05:24
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Yeah at least go huff some paint or something geez you guys.
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Aug 14, 2014 05:36
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Sniff coke for a strange effect.
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Aug 14, 2014 05:37
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SirDan3k posted:Sniff coke for a strange effect. *SirDan3k takes 12 DMG and loses turn!*
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Aug 14, 2014 05:44
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Meant to post post this a few weeks ago when I saw it:
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Aug 14, 2014 12:25
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Manky posted:Meant to post post this a few weeks ago when I saw it: I mean, yeah, OSHA.jpg, but it appears that the horizontal ladder is being supported by a device on the vertical ladder(s) that looks to be made just for the purpose of holding a ladder in that position. I could be totally wrong of course, and this could be OSHA of the year. Edit: I've seen painters in my area with this same setup. Let me see if I can figure out what that piece is called.
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Aug 14, 2014 14:27
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Manky posted:Meant to post post this a few weeks ago when I saw it: Eh, that doesn't look too bad. Doesn't look like you could build a scaffold there without loving up those bushes.
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Aug 14, 2014 14:34
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EZipperelli posted:I mean, yeah, OSHA.jpg, but it appears that the horizontal ladder is being supported by a device on the vertical ladder(s) that looks to be made just for the purpose of holding a ladder in that position. I could be totally wrong of course, and this could be OSHA of the year. Look at the ladder on the right.
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Aug 14, 2014 14:59
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FrozenVent posted:Look at the ladder on the right. It looks like it has a similar thing on the side that's facing the wall? 
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Aug 14, 2014 15:08
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It looks like it's resting on some decorative molding and not the actual roof. Or maybe the door is blocked, I don't know.
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Aug 14, 2014 15:58
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thylacine posted:It looks like it's resting on some decorative molding and not the actual roof. I can't tell if it's an I-beam or a gutter.
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Aug 14, 2014 16:07
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The original YouTube video is worth watching to hear the NSFW audio: https://www.youtube.com/watch?v=JJt7uKX5qEk Funny, there's even a second angle of this: http://www.maniacworld.com/how-not-to-pull-a-truck-out-of-ice.html smackfu fucked around with this message at 16:22 on Aug 14, 2014 |
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Aug 14, 2014 16:19
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EZipperelli posted:I mean, yeah, OSHA.jpg, but it appears that the horizontal ladder is being supported by a device on the vertical ladder(s) that looks to be made just for the purpose of holding a ladder in that position. I could be totally wrong of course, and this could be OSHA of the year. They are called 'ladder jacks' I have a set of them from my grandfather who was a painter in upstate Pennsylvania in the 30's on up. The ones I have are steel, and are hinged in the center with adjustable hooks, so you can get a level platform whether you mount them on the outside or inside of a ladder setup.
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Aug 14, 2014 17:39
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I'm pretty sure in order for that to be remotely safe, both supporting ladders need to be parallel and leaning at the same angle, with the feet very firmly planted.
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Aug 14, 2014 18:50
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