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CELL PHONE HOAX
Some time ago I posted a warning about the use of cell phones at gas/petrol stations only to be told this had all been a hoax. At this time I added this page to explain the situation. I have, however, now received the following information which I thought may be of interest.
After reading all the various comments I think the lesson to be learned is that it maybe wise to err on the side of caution - better safe than sorry!
A Junior Research Engineer, Shell Motorsport (18th December, 2007)
"I was just reading your article on the "mobile phone in petrol station hoax". This was because an email had been distributed amongst shell employees about a man killed due to an explosion due to petrol fumes when using the torch to check a product.
Although this is an unusual case, I still believe that there is some myth surrounding the use of mobile phones in petrol stations- your website claims that explosions as a result of mobile phone use are all myths, should be amended.
G. W. Low
"I work with electrical equipment for use in the Hazardous Area Industry. It is a well know fact that using a mobile phone while filling up at a petrol station could cause an explosion. It’s not the phone signal but the possible static charge that could build up on the person and then discharge to the car via the pump filler. I have a photo of a Shell burnt out station after such a situation. The people that are writing in should state their experience in the Petrol Chemical Industry before commenting."
Matt Morman (a cell phone technician)
"I had a few things to comment on about the "fact or fiction cell phone myth". There is a industry standard that our Government regulates the electronics used in gas pumps, and anything dealing with explosive chemicals. The reasoning for this is the ESD (Electrostatic discharge). Gas pumps have specialized equipment in them to dissipate the static. As a matter of fact, any equipment involved in the manufacturing, shipping, or selling of chemicals, or petroleum's has to b equipped with the protective circuits. All electronic devices emit ESD, regardless of the power output, However, cell phones are not equipped with this feature. That is why the owners manual for every cell phone carrier warns you not to use it at a gas pump, so they are not liable when someone blows themselves up.
The problem is that gas cannot be ignited by this low voltage but look at it from this stand point. If you are holding your cell phone while pumping your gas, the gas is not the problem, it is the fumes that the gas omits when it is being pumped, if you have ever pumped gas into your car in temperatures above 85 degrees F you will see the fumes. If your 2 feet from the source of the fumes and your phone rings, assuming the vapors have got into your phone, it is very possible that the vapors could be ignited by the frequency, but more likely the ESD spark that might be sent out thought the phone. Here is why, anything that consist of electrolytes can cause a bridge in power circuits, the electrolyte being the gasoline fumes, would bridge point a to point b, creating a spark from shorting, and or ESD displacement. And I know what most people would say, in theory it sounds good, BUT!! etc....... Am I in no way saying every time you use your phone at a gas station, you will blow yourself up, But what about a phone that is out of calibration, a malfunctioning phone if you will. What if the voltage regulator is out of calibration and is letting your phone charge at 2 times the rate, then the battery in your phone is over charged, and therefore could spark depending on the humidity, or heat, etc.... Even if there is no proven evidence of this now, one day it will happen.
That is why they tell you to put your gas jug on the ground to fill it, if it is in the bed of your truck, and you have a bed liner, guess what, no ground for the jug, the ESD from your body jumps through the nozzle of the pump when it hits the electrically charged up plastic and boom, your in flames before you know what happened. There is proof of this on the web, I saw it with my own eyes on the TV. Keep in mind they said Theory wise it made since 5 years ago, but there was no proof. Just as many people said that was not possible. THAT IS WHY THEY TELL YOU NOT TO, SO YOUR HOSPITAL VISIT DOESN'T HAVE TO SERVE THE PURPOSE OF PROVING SOMEBODY'S POINT. I think I'll take their word for it. And by the way I am a Cell phone technician, so my info is based on facts, not opinions. Thank you for your time."
I received the following warning regarding the use of cell phones in petrol stations but, unfortunately, this appears to have been a hoax. The warning posted on the site was as follows:-
Mr. Andrew Frost MIEE and R. S. Charig LL.B. MCIJ have both been kind enough to put me right with the following explanations -
Just one thing though (on a topic which annoys me a little!!) - your GarageTips include a report about using mobile phones at petrol stations. There are many petrol stations that ban mobile phone handsets, but all of the hype around this can be traced to an urban myth. There has been a lot of recent discussion on this issue by members of the Institution of Electrical Engineers (IEE) (though unfortunately I don't think you'll be able to look at the online forums unless you're a member...)
There are three possible causes of ignition of flammable vapours by a mobile phone:
1. The radio signal strength is well known and can be calculated (this is for GSM phones: I don't think that GPRS is much different, though I wouldn't like to say about UMTS - the so-called '3G' phones) - and the strength of the electromagnetic field produced by a GSM phone is not sufficient to cause petrol vapour to ignite. Signals from mobile phone handsets do not approach the strength of the masts to which they communicate, and there are over 200 of these hidden on Shell forecourts (http://news.bbc.co.uk/1/hi/uk/2309645.stm). So the danger from a mobile phone radio signal causing a fire is negligible.
2. This is discussed in a (technical) article at http://www.rvs.uni-bielefeld.de/publications/Papers/phonerisk.pdf - basically, unless you stick a bit of metal directly across the battery contacts, there is not enough energy in a mobile phone to cause a spark of sufficient energy to ignite petrol vapour.
3. A vibratory ringer is just a small off-balanced motor, and motors contain commutators that may cause sparks. I'm not sure if the energy involved in these (given the discussion in '2') will be more than the energy available from the battery (due to the coil of wire in the motor) but would say that, when comparing a tiny motor in a phone to a large starter motor that draws 200 Amps or so, then I know which one I'd say is more likely to cause a spark! In general the risk from the use of mobile phones at petrol stations is negligible; the reports of accidents are either (a) complete fabrication (http://www.snopes.com/autos/hazards/gasvapor.asp) or (b) due to other causes, such as static electricity (see http://www.esdjournal.com/static/cell/cell.htm).
I'm not asking you to take down the warnings on this that are on your site (it's better to be safe than sorry!), but I'd prefer it if they were tempered by some of the facts, or some of the opposing arguments were put forward.
Andrew Frost MEng MIEE
R. S. Charig explains -
I know it's difficult when you're dealing with raw information but I've found several untrue pieces of information. This one worries me the most and is an internet hoax. Verified by www.truthorfiction.com ..........
Cell Phones have Caused Explosions at Gas Stations - Fiction!
Summary of the eRumor
The issue is not a simple one, however, because some oil companies have issued bans on cell phones at their stations and cell phone manufacturers have printed warnings about using their equipment around fuel vapors.
Some observers say that the warnings are reactions to the false rumors of explosions and deaths caused by cell phones.
One of the eRumors describes three occasions of fires from cell phones: A man who was burned when a cell phone sitting on a bumper rang and caused and explosion; a man who was burned in the face while talking on his phone as he was pumping gas; a man whose phone caused a fire in the pocket of his pants while pumping gas. There's no proof that any of the stories is true.
Another oft-repeated story comes from Adelaide, Australia where, it is said, an explosion at a gas station in 1999 was caused by a man using a cell phone. A spokesperson for the the South Australian Metropolitan Fire Service says, however, there was no cell phone involved in the fire and he doesn't know how the rumor about the cell phone got started. The incident was mentioned in a 1999 article in The Bankok Post, which also said that a man from Indonesia was burned when his cell phone caused an explosion at a gas station. No substantiation has ever been found.
A wire service story circulated in 1999 out of Trail, British Columbia that said a man caught fire when the cell phone he was using caused an explosion while he filled his gas tank at a gas station. It caused quite a stir in Canada, but was later declared an urban legend.
Cell phone makers including Motorola and Nokia have included warnings about not using cell phones around gas vapors. In August of 1999, David Rudd, a spokesman for Motorola, told the San Francisco Chronicle that his company's warning was because of the remote possibility that a dislodged battery cause cause a spark, not because of the transmission of radio signals.
After stories started circulating in 1999 about explosions caused by cell phones, many companies began issuing bans on cell phone use at their gas stations including Chevron, Union 76, Circle K, Shell, Petro-Canada, Esso, and Exxon. Portable phones have been banned at gas stations in parts of Europe for many years, but Nokia spokesperson Megan Matthews told the Associated press on Jan 14, 1999 that those rules were from a bygone era when portable phones were more powerful than modern phones and that the bans were rarely enforced.
The whole article can be seen on www.truthorfiction.com
I can only apologise, as with all other content on Hints and Things, information is posted in good faith.
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