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Why dont petrol tanks explode?

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Old 24-03-2010, 09:43 PM
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900ss
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Default Why dont petrol tanks explode?

If you have an internal fuel pump?
Why is it the tank doesn't explode?

I assume the motors still create a spark?
If the tank is low to empty, why don't they explode ?
Old 24-03-2010, 09:45 PM
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Old 24-03-2010, 09:48 PM
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Petrol needs a certain amount of air to be combustable, and that certain amount of air isn't present in a sealed tank full of petrol fumes.
Old 24-03-2010, 09:49 PM
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And the pump motor is sealed.
Old 24-03-2010, 09:55 PM
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Originally Posted by Mal.
Petrol needs a certain amount of air to be combustable, and that certain amount of air isn't present in a sealed tank full of petrol fumes.
Even if the tank is old or empty ?
Guess it must be right, else we'd all be dead lol
Sounds odd still
Old 24-03-2010, 09:57 PM
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Originally Posted by 900ss
Even if the tank is old or empty ?
Guess it must be right, else we'd all be dead lol
Sounds odd still

Try getting a jerry can of petrol and putting a lighter to it. It won't explode, just burn the fuel out the neck of it!
Old 24-03-2010, 09:59 PM
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you can snub a cigarette out in an ashtray of fuel.

useless, but i liked it when it was shown to me.
Old 24-03-2010, 10:00 PM
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Originally Posted by St3V3_C
And the pump motor is sealed.
But runs in fuel ?
I pulled an ol 044 pump apart and atleast it looked like that ?
They are the same type of pump, i.e for external or internal use?
Old 24-03-2010, 10:08 PM
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Originally Posted by Mal.
Try getting a jerry can of petrol and putting a lighter to it. It won't explode, just burn the fuel out the neck of it!
I'll take your word for that one
But can't see me wanting to try it !

Originally Posted by orionmojo
you can snub a cigarette out in an ashtray of fuel.
useless, but i liked it when it was shown to me.
I've seen a cigar dropped (by accident) into a bowl of fuel, but assumed as it wasn't a spark thats why it didn't ignite
Whereas a elecy pump would have a constant spark, like a spark plug
Old 24-03-2010, 10:12 PM
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So when people flick a Ciggy' is films into petrol, and it all goes up, is it bollocks?
Old 24-03-2010, 10:12 PM
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Originally Posted by 900ss
I'll take your word for that one
But can't see me wanting to try it !

You don't know what ya missing!

After you've tried that, try chucking a can of WD-40 into a bonfire.... Stand well back though.
Old 24-03-2010, 10:16 PM
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Originally Posted by Mal.
Try getting a jerry can of petrol and putting a lighter to it. It won't explode, just burn the fuel out the neck of it!
Totally different. A jerry can only has air present at the neck hence why it only burns the fuel there and doesnt all go up!
A petrol tank DOES have air in, as it is not a sealed unit, it has a breather otherwise it would collapse inwards due to vacuum!
Old 24-03-2010, 10:17 PM
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Originally Posted by Benni
So when people flick a Ciggy' is films into petrol, and it all goes up, is it bollocks?
yes mate its complete bollocks its not the fuel that burns its the vapours this is why fuel in an engine is atomised to get combustion

also diesel wagons and buses that explode when crashing on films is bollocks also it just would not happen!
Old 24-03-2010, 10:20 PM
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Originally Posted by Lee Reynolds
Totally different. A jerry can only has air present at the neck hence why it only burns the fuel there and doesnt all go up!
A petrol tank DOES have air in, as it is not a sealed unit, it has a breather otherwise it would collapse inwards due to vacuum!

A petrol tank has a breather but it's not an 'open' valve, otherwise all ya petrol would disappear in vapour!

The oxygen content is too low to allow the petrol to ignite.
Old 24-03-2010, 10:21 PM
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Originally Posted by botters
yes mate its complete bollocks its not the fuel that burns its the vapours this is why fuel in an engine is atomised to get combustion

also diesel wagons and buses that explode when crashing on films is bollocks also it just would not happen!
a guy on 1 of those shit hospital programmes had that happen, fag flicked and he's filling his bike up with petrol

burn his legs bad but his cock wasnt singed
Old 24-03-2010, 10:23 PM
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was a good mythbusters where they kept shooting a petrol tank to try get it to blow up like they do in the movies, took them ages and they had to use tracer bullets in the end to eventually get it to go. Seems to be a lot harded than youd imagine getting petrol to go up!!!
Old 24-03-2010, 10:27 PM
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ill never forget my mate dropping his fag in jerry can and me running for my life...

Ill also never forget me pumping fuel out of an old escort with a fuel pump and the whole side of the car going up, my pants too, Running to the garage in my boxers looking for the fire extinguisher whilst my pants are on fire, the car and the pump STILL pumping fuel onto the jerry can, lesson learnt!!
Old 24-03-2010, 10:28 PM
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Originally Posted by StephenC
was a good mythbusters where they kept shooting a petrol tank to try get it to blow up like they do in the movies, took them ages and they had to use tracer bullets in the end to eventually get it to go. Seems to be a lot harded than youd imagine getting petrol to go up!!!
Obviously bullets don't, they're just a piece of lead
Old 24-03-2010, 10:30 PM
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Originally Posted by botters
yes mate its complete bollocks its not the fuel that burns its the vapours this is why fuel in an engine is atomised to get combustion

also diesel wagons and buses that explode when crashing on films is bollocks also it just would not happen!
So an empty Jerry can is more dangerous than a full one? Have I got this right? And why won't Diesels blow up?

Benni.
Old 24-03-2010, 10:31 PM
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Originally Posted by Benni
And why won't Diesels blow up?
Diesel has to be compressed to explode
Old 24-03-2010, 10:32 PM
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It is a bit boring when something doesn't blow up like in a John Woo film
Old 24-03-2010, 10:34 PM
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Originally Posted by zetec-Sam
Diesel has to be compressed to explode
+1
Old 24-03-2010, 10:34 PM
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Originally Posted by Mal.
A petrol tank has a breather but it's not an 'open' valve, otherwise all ya petrol would disappear in vapour!

The oxygen content is too low to allow the petrol to ignite.
Your right, but the valve opens as the fuel is being drawn from the tank - hence air entering the tank - when the pump is running!
Old 24-03-2010, 10:36 PM
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Originally Posted by 1.9 xr2 on 40's
a guy on 1 of those shit hospital programmes had that happen, fag flicked and he's filling his bike up with petrol

burn his legs bad but his cock wasnt singed
well ive tried flicking fags at petrol and it dont work probably more likely it lit on the exhaust or he spilt some and kickstarted it then it lit like my mate did with his jetski lol but thats another story!
Old 24-03-2010, 10:37 PM
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Originally Posted by Benni
So an empty Jerry can is more dangerous than a full one? Have I got this right? And why won't Diesels blow up?

Benni.
I guess so Benni as its full of vapours! Thats why it costs a fortune when old petrol stations are sold for building on as the tanks have to be decommisioned - imagine the vapours in those!
Old 24-03-2010, 10:38 PM
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Originally Posted by Lee Reynolds
Your right, but the valve opens as the fuel is being drawn from the tank - hence air entering the tank - when the pump is running!

air is in the tank yes but the amount that gets into the fuel while being pumped is insufficient to cause ignition
Old 24-03-2010, 10:41 PM
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Originally Posted by Benni
So an empty Jerry can is more dangerous than a full one? Have I got this right? And why won't Diesels blow up?

Benni.
Try having a jar full of petrol and drop a lit match in it. The petrol will extinguish the match.

Try having a jar that has just been emptied of petrol and drop a match in it. More than likely you will get a flash or a little fire.
Old 24-03-2010, 10:42 PM
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you are all lier's!!!!

the movies are real!!!!!!!!!!!

fuel explodes, just look at all them films where they blow up the fuel depots and stuff so that the baddies can't escape, with explosions and exploding shit, and bulliets and stuff

stop filling benni's head with usefull facts
Old 24-03-2010, 10:47 PM
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Originally Posted by dojj
you are all lier's!!!!

the movies are real!!!!!!!!!!!

fuel explodes, just look at all them films where they blow up the fuel depots and stuff so that the baddies can't escape, with explosions and exploding shit, and bulliets and stuff

stop filling benni's head with usefull facts
Yep, just like wrestling is real too...
Old 24-03-2010, 10:48 PM
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I'm with you Dojj, and you can add Nitrous Oxide to the list, just like in the F&F film where the cigar lighter ignites the nitrous vapour!

Pure artistic license, or to put it plainly, bullshit
Old 24-03-2010, 10:49 PM
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Originally Posted by botters
air is in the tank yes but the amount that gets into the fuel while being pumped is insufficient to cause ignition
Lol i know mate i was just saying there is air in there its not totally air free
Old 24-03-2010, 10:51 PM
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Originally Posted by Icurus
I'm with you Dojj, and you can add Nitrous Oxide to the list, just like in the F&F film where the cigar lighter ignites the nitrous vapour!
Naahhh Bruv i see dat done, iniit, dis boy down maccy d's yea, iz saxo went up cos of the nos, yeah.
Old 24-03-2010, 10:57 PM
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Originally Posted by 900ss
Even if the tank is old or empty ?
Guess it must be right, else we'd all be dead lol
Sounds odd still
Still be combustant fumes in the tank .. When ever they get welded (Pro) You have to fill the tank with C02 ..

Diesel tanks needs to Be flooded with C02 as well .. Same with Hydraulic and other Oil tanks ..

I've see a Diesel tank being welded still on the truck full of fuel .. You just gotta weld below the fuel level line ..
Old 24-03-2010, 11:50 PM
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Fire erupting in a minor collision?

http://www.youtube.com/watch?v=8eYON...layer_embedded

Charlie
Old 24-03-2010, 11:59 PM
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Originally Posted by Lee Reynolds
I guess so Benni as its full of vapours! Thats why it costs a fortune when old petrol stations are sold for building on as the tanks have to be decommisioned - imagine the vapours in those!
Yeah... Must be crazy. So can I go and throw a lit ciggy' on the floor at my local garage while shouting 'I'll do it, I'm gonna' end it!' And everyone will panick for nothing? Could be a good April fools this... My local might start turning the pump on at request now.

Benni.
Old 25-03-2010, 12:00 AM
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Originally Posted by Char1ie
Fire erupting in a minor collision?

http://www.youtube.com/watch?v=8eYON...layer_embedded

Charlie
that would be a combo of fuel hot exhaust arcing wires and sparks from impact
Old 25-03-2010, 12:01 AM
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Originally Posted by botters
that would be a combo of fuel hot exhaust arcing wires and sparks from impact
Indeed.
Old 25-03-2010, 12:09 AM
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this is a fuel tank imploding
http://www.liveleak.com/view?i=8b8_1208931048
Old 25-03-2010, 12:36 AM
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Originally Posted by botters
this is a fuel tank imploding
http://www.liveleak.com/view?i=8b8_1208931048
Take more than a DYSON to do that (Yes even the Fooking new one )

Wonder why they did the test? MM maybe a pressure test incase it goes underwater?
Old 25-03-2010, 01:01 AM
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Originally Posted by Benni
Yeah... Must be crazy. So can I go and throw a lit ciggy' on the floor at my local garage while shouting 'I'll do it, I'm gonna' end it!' And everyone will panick for nothing? Could be a good April fools this... My local might start turning the pump on at request now.

Benni.
No because your local petrol station isn't an open swimming pool of petrol. Theres a lot of petrol vapour's around the pump naturally.


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