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Static Question #214
12/27/00 08:19 PM
12/27/00 08:19 PM
Bill Addiss  Offline OP
Member
Joined: Oct 2000
Posts: 3,890
NY, USA
Can Anyone easily explain how and why static builds up on someone in a car or truck?

I have wondered why I get a shock sometimes getting out of the vehicle. I never really thought much about it. Today after getting gas (self serve) I got back into the van and started to drive away, looked in the mirror and saw that I had left cap off and door open (mind was elsewhere I guess). I stopped and got out to put the cap on and got a nice shock when putting the cap on (touched metal somewhere). Having a spark in front of the entrance to my gastank really caught my attention.

Anyone know of a way to keep this from happening?

Work Gear for Electricians and the Trades
Re: Static Question #215
12/28/00 12:48 AM
12/28/00 12:48 AM
E
Eclavea  Offline
Junior Member
Joined: Dec 2000
Posts: 5
OKC
I've always wondered how to prevent it to. What keeps the static down on me is those fabric softener/ static stopping sheets for the dryer.


Eclavea
Re: Static Question #216
12/28/00 07:59 AM
12/28/00 07:59 AM
G
gto6t7  Offline
Member
Joined: Dec 2000
Posts: 27
Machias, ME
Had an electrician working for me years ago that screwed some jack chain to the rear bumper so it draged on the ground and it stoped him from getting a shock everytime he got out of the van. After time the part of the chain that touched the ground would wear down and he would start getting shocked again so he just added a few fresh links to the end.

Dave T.

Re: Static Question #217
12/28/00 08:09 AM
12/28/00 08:09 AM
G
gto6t7  Offline
Member
Joined: Dec 2000
Posts: 27
Machias, ME
Had an electrician working for me years ago that screwed some jack chain to the rear bumper so it draged on the ground and it stoped him from getting a shock everytime he got out of the van. After time the part of the chain that touched the ground would wear down and he would start getting shocked again so he just added a few fresh links to the end.

Dave T.

Re: Static Question #218
12/28/00 08:14 AM
12/28/00 08:14 AM
Bill Addiss  Offline OP
Member
Joined: Oct 2000
Posts: 3,890
NY, USA
I guess that the thing that surprises me the most is that I only drove 5 feet. The charge built up in a matter of seconds. I will surely be more careful next time I get gas!

I'm wondering, is this part of the reason that some states do not allow self serve pumps at Gas stations?

Re: Static Question #219
12/28/00 08:30 AM
12/28/00 08:30 AM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
In my opinion most of the static charge builds up between your outer clothing and the seat covers as you slide in or out. If you hold on some bare metal(painted metal is an insulator) on the vehicle as you are getting in or out the charge will be dicharged and no spark will be produced.
In my opinion most of the static charge builds up between your outer clothing and the seat covers as you slide in or out. If you hold on some bare metal(painted metal is an insulator) on the vehicle as you are getting in or out the charge will be discharged and no spark will be produced.
The heat energy is not normally high enough to ignite gasoline vapors, but it is possible. If it did all you would get is a small flash as the vapors around the fill tube burned off. The flame will NOT travel into the tank(the mixture is well above UEL(upper explosive or flammable limit) and it will NOT explode.
Don(resqcapt19)


Don(resqcapt19)
Re: Static Question #220
12/28/00 08:48 AM
12/28/00 08:48 AM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Here are a couple of sites to look at:

This one is a statement from the American Petroleum Institute about static and filling gas tanks. http://www.api.org/apireports/static.htm

This one is some general static electricity information with a section on cars. http://www.eskimo.com/~billb/emotor/zapped.html
Don(resqcapt19)


Don(resqcapt19)
Re: Static Question #221
12/28/00 08:51 AM
12/28/00 08:51 AM
Bill Addiss  Offline OP
Member
Joined: Oct 2000
Posts: 3,890
NY, USA
Don,

Thanks for the comments. It makes me feel better!! [Linked Image] I do usually touch metal when getting out, though not purposely. I will try to do it all the time now though just to be on the safe side.

Re: Static Question #222
12/28/00 04:13 PM
12/28/00 04:13 PM
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,708
Anaheim, CA. USA
Don hit the nail on the head!
When you slide across the car seat, you scrape up free electrons from the seat. If you do not ground your self while sliding, the charges build up in your body rapidly, which accumulate to create a large potential [voltage]. The car body is considered ground in this instance, however an actual ground connection is rarely required to discharge static charges [just scrape your feet on a carpet when the weather is prone to static, then touch another person. This should demonstrate this point!!].


Scott.


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: Static Question #223
12/28/00 11:11 PM
12/28/00 11:11 PM
Bill Addiss  Offline OP
Member
Joined: Oct 2000
Posts: 3,890
NY, USA
Don,

Those were good Links! Upon reading some of the information it seems that static electricity can also be built up from simply sitting on a plastic seat (mine are fabric though) and it might have been lucky that the spark happened after some of the fumes had cleared. I will add some of this info to one of the safety areas soon.

Bill

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