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Leperflesh posted:I'm not saying smoking next to your car while you fill it up is a great idea; only that the hollywood impression of how explosive liquid gasoline is, and how easily cars blow up at the slightest provocation, is ridiculously inaccurate. As a counter example here is an actual Hollywood style car explosion in real life. https://www.youtube.com/watch?v=vgeBeuqnxIU For your own reference don't use alcohol to remove bed bugs from your car. Also don't smoke next to a car filled with alcohol vapor.
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Apr 19, 2015 08:21
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Uh yeah alcohol vaproises very fast, that's why rubbing alcohol feels so cool on the skin, and it ignites very easily, way easier than gas, so yeah. Dont soak your upholstery in alcohol, folks.
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Apr 19, 2015 08:43
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It's all right; it was a rental, anyway.
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Apr 19, 2015 09:13
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Shalebridge Cradle posted:As a counter example here is an actual Hollywood style car explosion in real life. You know what explodes pretty much on par with it's Hollywood depiction? Compressed gas cylinders. No pictures but probably the most OSHA thing I ever saw was during a student riot in 2009ish in Montreal where some geniuses got their hands on an big rear end acetylene tank and intended on using it as a battering ram. I was there with a friend to log some first aid hours and after a few seconds of pure  we went over and explained to the guys in no uncertain terms that we were taking it away.Incidentally riot police will still give you all kinds of gently caress you looks when you approach them slowly and explaining clearly your intention of transferring what is essentially a bomb to them for disposal.
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Apr 19, 2015 10:18
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Klaus Kinski posted:In europe, a gas station is technically a atex/ex area and I can easily see someone new on the job just covering his rear end. There's probably something similar in the US as well. I don't know what this means, but here in the Netherlands, all those 'no cellphone' signs were removed from gas stations after it became common knowledge that a cellphone will never cause gas to ignite. Well, unless you have one of those phones were the battery spontaneously started burning in people's pockets. fatman1683 posted:Fountains of Paradise is another good book about the construction of a Space Elevator. Plus it was written by Arthur C. Clarke, who was an actual factual science person. Speaking of which, there's another space elevator-like construction called a space fountain. It is theoretically possible... but uh there are some problems. A space fountain is basically a 35000 km tall equivalent of this:  Well, except they use magnets to shoot charged particles up. But the idea is the same. The kinetic energy of the rising particles keeps the entire thing upright. The main practical problem is that as soon as someone switches off the power, the 35000 km tall structure immediately falls apart. Yes, some parts at the top would float up into space. The rest would come falling down. Short blackout? Tower sized chunks come falling down in a hundreds of miles wide area around the space fountain. Carbon dioxide fucked around with this message at 10:58 on Apr 19, 2015 |
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Apr 19, 2015 10:50
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surebet posted:You know what explodes pretty much on par with it's Hollywood depiction? Compressed gas cylinders. From the Russia.jpg thread: https://www.youtube.com/watch?v=QMq0M7Xe_Ls Also, lol at the dudes parking on the leftmost-lane to watch.
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Apr 19, 2015 11:06
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Decrepus posted:Goofus and Gallant of GBS.
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Apr 19, 2015 11:47
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Bum the Sad posted:So do people have to rip out their car stereos and then put them and their cell phones in a mailbox at the entrance to every gas station? Or they can just turn their car off like anyone who's not a loving idiot 
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Apr 19, 2015 15:56
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Gorilla Salad posted:Or they can just turn their car off like anyone who's not a loving idiot Most cars can play the radio with the key in the off position. There's no chance of a spark, though; this is a solid-state device powered by the car battery. Then again, there's no chance of an external spark from a goddamn cell phone, either.
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Apr 19, 2015 19:26
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No you're looking too closely you're going to realize we have been the osha.jpg all along. Its hard to argue about solid state electronics failing just right to set off a gas fire when cars are bundles of wires begging to spark. But A. noone wants to pay money to prove the first part so they just go the low liability route and say no phones at the pump and B. the second part comes with the territory with wanting to refuel a car. When you get gas, do you orient yourself to the location of the emergency shutdown or attendant who would be able to affect a shutdown? Have you never dribbled a bit of gas down the side of your car? Remember to discharge your static every time? For being technically flammable, gas' comparative difficulty in actually catching fire is probably a big reason why there aren't gas station catastrophes every other week.
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Apr 19, 2015 19:50
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Apr 20, 2015 01:26
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Carbon dioxide posted:A space fountain is basically a 35000 km tall equivalent of this: A 35000km tall wacky waving arm flailing tube man sounds pretty awesome
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Apr 20, 2015 06:09
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Gorilla Salad posted:You say that as if a space elevator doesn't have to be 70,000 kilometres long. It wouldn't actually be that huge of a disaster, since most of the cord would just burn up in the atmosphere. "Strong" in this instance just means "high tensile strength," it's not going to be super-heat resistant or anything. quote:We can't even build a bridge more than a few kilometres long and not even across open ocean, but I'm supposed to believe we will one day build a bridge 70,000km straight up? This on the other hand is a pretty solid objection.
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Apr 20, 2015 13:25
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Yet another crazy space launch idea.
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Apr 20, 2015 13:57
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Crazy space launch idea (that has probably shown up in this thread before). https://en.wikipedia.org/wiki/Project_Orion_%28nuclear_propulsion%29
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Apr 20, 2015 14:12
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Serrath posted:I'm upset that mythbusters didn't test this theory when they tested the cigarette myth because now I have no way of knowing whether using my phone while filling up could kill me As someone already said, they did test this. Even when they purposely damaged the phone, they could not get a cell phone to cause an explosion. Several years ago I read something on another forum that might be total B.S,. but it makes sense. When cell phones started getting popular, BP changed their training for gas delivery drivers, forbidding the use of cell phones while pumping from the truck into the underground tank. This was to make sure the driver was paying attention when transferring the gas, not because the cell phone would cause an explosion. Word got out about the cell phone ban, but not the reason behind it, and people just assumed it was because of an explosion hazard.
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Apr 20, 2015 14:33
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CollegeCop posted:As someone already said, they did test this. Even when they purposely damaged the phone, they could not get a cell phone to cause an explosion.
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Apr 20, 2015 14:39
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zedprime posted:Why doesn't that reason apply to people pumping gas into their car? Or driving. Or walking in a straight line.
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Apr 20, 2015 14:49
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Good example of why you shouldn't use your cellphone while dealing with combustible gases!
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Apr 20, 2015 15:30
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That doesn't even look real. How does the manhole rise on a literal pillar of fire for a good long fraction of a second before the shockwave emerges?
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Apr 20, 2015 15:45
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haveblue posted:That doesn't even look real. How does the manhole rise on a literal pillar of fire for a good long fraction of a second before the shockwave emerges? Gotta have the right fuel / air mixture to explode, I guess.
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Apr 20, 2015 15:48
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haveblue posted:That doesn't even look real. How does the manhole rise on a literal pillar of fire for a good long fraction of a second before the shockwave emerges? Thermodynamics
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Apr 20, 2015 15:49
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Thump! posted:Good example of why you shouldn't use your cellphone while dealing with combustible gases! Looks more like static discharge when he touched the manhole.
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Apr 20, 2015 16:09
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I think it's actually something dumber and he drops a match in there, like usually there would just be a little "pop" as the gas comes out of the holes in the grate but this time there was a little bit more gas than the guy was expecting. I like to imagine him saying "Hey, kids! Look a this"
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Apr 20, 2015 16:22
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Olewithmilk posted:I think it's actually something dumber and he drops a match in there, like usually there would just be a little "pop" as the gas comes out of the holes in the grate but this time there was a little bit more gas than the guy was expecting. I like to imagine him saying "Hey, kids! Look a this" Yes, you can see him striking the match just before he drops it. You know that party trick with igniting the fumes in a empty liquor bottle? That's the big version.
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Apr 20, 2015 16:28
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haveblue posted:That doesn't even look real. How does the manhole rise on a literal pillar of fire for a good long fraction of a second before the shockwave emerges? Deflagration to detonation transition, maybe? Initially it just burned, but once the right conditions are met it became a supersonic detonation. Apparently this is a thing that can happen with natural gas in the right environmental conditions, and in areas with favorable geometry. Slanderer fucked around with this message at 16:37 on Apr 20, 2015 |
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Apr 20, 2015 16:34
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Slanderer posted:Deflagration to detonation transition, maybe? Initially it just burned, but once the right conditions are met it became a supersonic detonation. Apparently this is a thing that can happen with natural gas in the right environmental conditions, and in areas with favorable geometry. Probably. Deflagration creates a pressure wave in a confined space, pressure wave reflects off the walls of the space and reconverges, causing a massive pressure surge close to the location of the flame front. If there's still enough fuel and oxygen left, you get a detonation.
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Apr 20, 2015 17:06
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Lurking Haro posted:Yes, you can see him striking the match just before he drops it. Never heard of that party trick.
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Apr 20, 2015 17:25
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What a strange trick.
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Apr 20, 2015 17:38
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haveblue posted:That doesn't even look real. How does the manhole rise on a literal pillar of fire for a good long fraction of a second before the shockwave emerges? Actual explosions and movie explosions don't act the same way. It was some idiot Chinese guy showing his son and nephew a neat-o parlor trick. But man, that manhole cover goes FLYING  http://www.liveleak.com/view?i=15a_1332509164&comments=1
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Apr 20, 2015 19:04
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Tony Homo posted:Never heard of that party trick. Works with a freshly emptied bottle of hard liquor. They use isopropyl alcohol in this video, but the effect is similar. https://www.youtube.com/watch?v=a5RvwNBFMOY
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Apr 20, 2015 19:27
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Lurking Haro posted:Works with a freshly emptied bottle of hard liquor. Works with bigger bottles too.  (Didn't I see this video the first time in a Osha thread here?)https://www.youtube.com/watch?v=Y0Y6dgwiVFM
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Apr 20, 2015 22:50
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haveblue posted:That doesn't even look real. How does the manhole rise on a literal pillar of fire for a good long fraction of a second before the shockwave emerges? look at how a pulsejet works, maybe that's what's happening.
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Apr 20, 2015 23:56
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Carbon dioxide posted:Yet another crazy space launch idea. Anything that gets you that horizontal speed. Getting to space is easy. Getting into an orbit is hard.
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Apr 21, 2015 00:01
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70,000km seems kind of a long way ... how far up does something actually need to go to be for a space elevator to be useful? How far up do most satellites orbit? 70k km is like 30% of the way to the moon.
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Apr 21, 2015 00:18
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Tambaloneus posted:70,000km seems kind of a long way ... how far up does something actually need to go to be for a space elevator to be useful? How far up do most satellites orbit? 70k km is like 30% of the way to the moon. Geosynchronous orbit is a very high orbit. You can orbit the Earth at any point high enough that you can counter whatever atmospheric drag you are subjected to, but your orbital position will be different relative to a spot on the ground, from moment to moment. Most stuff we launch into space is into a Low Earth Orbit (LEO). Examples include the ISS, most satellites, everything the space shuttle ever did, etc. Communications satellites, GPS, weather satellites, and others are often placed into GEO in order to be located in a stable direction from any given point in the hemisphere that can see them, or to have a constant view of an area of the surface. A space elevator is presumed to need to be anchored to the ground at a specific spot, so its center of mass has to be at a stable position relative to the ground: a geosynchronous orbit is probably the only option.
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Apr 21, 2015 00:28
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Zopotantor posted:Gasoline vapors are heavier than air, which is why you wouldn't want to do this with gasoline: My first-year chemistry prof was awesome. One lesson ended with the detonation, in order, of four balloons. He had a big electric cattle-prod thing with a glowing tip, and he crouched down behind the front dias (a big desk-thing bolted to the floor) and waved the thing around until it contacted each balloon. 1. Hydrogen POP 2. Methane POP!! 3. Ethane POP!!!!!! 4. Acetylene KA-BOOOOOOM!!!! We filed out of the lecture hall with bits of charred balloon rubber raining all over us. In a later lecture he dropped a lump of sodium metal into a heavy glass bottle full of chlorine gas; after the fireworks he kicked it outside through a side-door.
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Apr 21, 2015 02:27
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Met posted:Anything that gets you that horizontal speed. Getting to space is easy. Getting into an orbit is hard. As seen here: http://corpsmoderne.itch.io/flappy-space-program
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Apr 21, 2015 03:02
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Apr 21, 2015 03:42
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Airframe parachutes!  http://www.dailylocal.com/general-news/20150420/new-garden-public-works-employee-injured-in-explosion quote:LANDENBERG >> What started out as someone dumping an item from a weekend spring clean-up nearly turned into a disaster as a 25-year-old public works employee was injured Monday when a self-deploying parachute for an ultralight aircraft exploded.
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Apr 21, 2015 07:30
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