Which side is the fuel tank filler on?
in [UK Drivers]
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From: Ian Jackson on 26 May 2010 11:23 In message <htjasi$ab4$2(a)heffalump.dur.ac.uk>, Albert T Cone <a.k.kirby(a)durham.ac.uk> writes >boltar2003(a)boltar.world wrote: >> On Wed, 26 May 2010 14:55:58 +0100 >> Albert T Cone <a.k.kirby(a)durham.ac.uk> wrote: >>> Another way to imagine it is that, given a low-resistance path to >>>earth, the charge on the car will discharge to earth in a very short >>>time, producing a short current pulse (with a high peak value, hence >>>the putative spark risk), in which the bulk of the energy is >>>contained in high frequency (RF) components. The effect of the >>>rings is to increase the reactance of the conductor at high >>>frequencies, thus preventing a short current pulse and reducing the >>>peak current and the concomitant spark risk. >> Ah ok. They're just acting like inductors in other words. > >Indeed. Maybe I'm sticking my neck out a little, but I think that explanation is simply not true. It may be why they put the rings on the hoses (assuming they are ferrite - which I doubt), but the increase of inductance obtained is unlikely to have any appreciable effect on the amplitude of a spark discharge. It all sounds like a mixture of snake oil and 'SWAR' grease! -- Ian
From: Silk on 26 May 2010 13:36 On 25/05/2010 15:58, Albert T Cone wrote: > On 23/05/2010 13:23, Silk wrote: >> On 23/05/2010 09:56, GT wrote: >> >>> The hose length is controlled by law - it cannot touch the ground when >>> the >>> nozzel is 'parked'. >> >> I think you may have made that up. I've seen plenty that drag on the >> ground. That's why they have rubber rings around the hose that settle at >> the point where the hose scrapes on the floor, to stop it chaffing. > > Those aren't rubber rings - they are ferrous rings and are there to > prevent arcing when you touch the filler nozzle to the car body. No they're not, they're rubber, or at least a rubbery substance. I know they're there to stop the hose being worn through when it drags on the ground as they always settle at that point and it's plain obvious that's what they're for.
From: Silk on 26 May 2010 13:42 On 26/05/2010 11:12, GT wrote: > "Silk"<me(a)privacy.net> wrote in message > news:htb6n0$ash$2(a)speranza.aioe.org... >> On 23/05/2010 09:56, GT wrote: >> >>> The hose length is controlled by law - it cannot touch the ground when >>> the >>> nozzel is 'parked'. >> >> I think you may have made that up. I've seen plenty that drag on the >> ground. > > Please feel free to 'think' what you like. As someone who uses garage forecourts more than most, I think I'm in a good position to report the facts. There are plenty of forecourts where the hoses are allowed to drag on the floor, protected by the previously mentioned rings. Parked or otherwise. There are legal requirements and > regulations with which petrol stations and equipment must comply - the hose > not dragging on the floor is one of the regulations. Assuming there is such a regulation, the arrangement described complies as the hose doesn't actually touch the ground - it's those rings again.
From: Silk on 26 May 2010 13:44 On 26/05/2010 14:55, Albert T Cone wrote: > They don't prevent 'static', they simply limit the rate at which the > charge built up on the car body can discharge (i.e. the current). > Actually they limit the rate at which the current flowing along the pipe > can /change/, but for the sake of arm-waving we can regard that as the > same thing. Bloody hell, there's no half measures with you, is there? When you make something up, you really go for it.
From: Silk on 26 May 2010 13:45
On 26/05/2010 16:23, Ian Jackson wrote: > Maybe I'm sticking my neck out a little, but I think that explanation is > simply not true. "Bullshit" is the word you're looking for. |