fly_tornado Posted December 12, 2012 Share Posted December 12, 2012 The plastic bicycle pump is where the problem comes from. The action of rubbing two non-conductive surfaces together in the right conditions (ie little humidity) can generate enormous amounts of static. ahh yes but how does the vapours of the fuel get up that tiny pipe when you are pumping in fresh air? Link to comment Share on other sites More sharing options...
Riley Posted December 12, 2012 Author Share Posted December 12, 2012 Thanks to all for the refuelling hints and pointers (I particularily like Greg's pressure plan) but I'm curious re the basis of concerns for static-generated fire risks if said risks are catered for. Most certainly the possibilty of static discharge is ever present however, my operational procedure when refuelling from a jerry can (metal or plastic) by using lengths of ss bath plug chains and alligator clips for inter-connnection is: (a) aircraft fuselage earthed to proper grounding point; (b) funnel earthed to fuselage; © jerry can earthed to funnel prior to any fuel being poured/siphoned. Ergo - any static electricity is expected to discharge straight to ground if and when generated. So.. somebody please advise if I've been luckily living in a fool's paradise, (otherwise I'm gonna plagiarize and play with Greg's hook-up). Standing by. cheers Link to comment Share on other sites More sharing options...
boingk Posted December 12, 2012 Share Posted December 12, 2012 Top marks, Maj hahahaha! I just like those squat cans as they are easier to hold/shoulder and pour from a raised position. Cheers - boingk Link to comment Share on other sites More sharing options...
skeptic36 Posted December 12, 2012 Share Posted December 12, 2012 When working on any vessel used to store gasoline, try to remove ALL traces of vapor before working. I'm highly of the opinion that you should flush with water and then give an air flush for at least 5 minutes prior to working. All that entails is letting a blower-vac or compressed air hose blast into the thing for 5 minutes, pushing air into and then out of the vessel and hopefully taking any explosive vapors with it If need be I would also recommend the use of a small stepladder to raise yourself. - boingk Better to use argon from the mig welder gas bottle, it's an inert gas. No wait ..... Better still don't work on them at all. Link to comment Share on other sites More sharing options...
boingk Posted December 12, 2012 Share Posted December 12, 2012 Better to use argon from the mig welder gas bottle, it's an inert gas. No wait ..... Better still don't work on them at all. Better still, lock yourself in a padded room and you'll be completely safe from those loud, noisy, fast things we love. Personally I'm amazed at the amount of complexity people seem to want to incorporate into things... simple things like refuelling. Stepladder plus jerrycan, simple! Multi-switched electrical hydrotransferring duvalacky? Waaay overthinking it I reckon. - boingk 1 Link to comment Share on other sites More sharing options...
skeptic36 Posted December 12, 2012 Share Posted December 12, 2012 Better still, lock yourself in a padded room and you'll be completely safe from those loud, noisy, fast things we love.Personally I'm amazed at the amount of complexity people seem to want to incorporate into things... simple things like refuelling. Stepladder plus jerrycan, simple! Multi-switched electrical hydrotransferring duvalacky? Waaay overthinking it I reckon. - boingk Sorry mate, I didn't' mean to suggest you to try to maximise your safety, disregard what I said and keep doin what your doin, you'll be fine.... 1 Link to comment Share on other sites More sharing options...
gregrobertson Posted December 12, 2012 Share Posted December 12, 2012 Another view of my fuel rig for thoes interested. The alumimium tube is 12mm. A later addition is a cable attached to the aluminium tube at the top which is earthed to the aircraft. This ensures that there is no difference in electrical potential between the fuel in the tank and the fuel in the jerry can. (hopefully no sparks). I cannot claim the idea is original just an adaptation of what others have done before, however it works well and certainly saves my back. Greg. 2 Link to comment Share on other sites More sharing options...
68volksy Posted December 13, 2012 Share Posted December 13, 2012 Definitely great idea to go with a pump if available. We actually use Avgas in the Gazelle's 912 as it removes a lot of the risk of spillage (once you've had a little practice), is a hell of a lot easier than filling and transporting 6 x 20 litre jerry cans every weekend and most importantly in my view removes the risk of damage to the aircraft by a student slipping with a jerry can and writing off a wing! The less time the wings and our hands/clothing spend soaked in petrol the better also. robinsm on here has actually rigged up a little pump on a jerry can which he can plumb into his fuel system when doing long cross-country's. Gives him an emergency reserve if it's needed and makes refuelling off-campus a lot easier. Link to comment Share on other sites More sharing options...
boingk Posted December 13, 2012 Share Posted December 13, 2012 Sorry mate, I didn't' mean to suggest you to try to maximise your safety, disregard what I said and keep doin what your doin, you'll be fine.... Righteo, cheers ma... Sorry, couldn't resist. Agree with your point though, I'd rather not work on a fuel vessel where possible. Still, if you're going to, may as well make sure you do it properly. - boingk Link to comment Share on other sites More sharing options...
eightyknots Posted December 17, 2012 Share Posted December 17, 2012 Thanks to all for the refuelling hints and pointers (I particularily like Greg's pressure plan) but I'm curious re the basis of concerns for static-generated fire risks if said risks are catered for. Most certainly the possibilty of static discharge is ever present however, my operational procedure when refuelling from a jerry can (metal or plastic) by using lengths of ss bath plug chains and alligator clips for inter-connnection is: (a) aircraft fuselage earthed to proper grounding point; (b) funnel earthed to fuselage; © jerry can earthed to funnel prior to any fuel being poured/siphoned. Ergo - any static electricity is expected to discharge straight to ground if and when generated. So.. somebody please advise if I've been luckily living in a fool's paradise, (otherwise I'm gonna plagiarize and play with Greg's hook-up). Standing by. cheers How come I have been able to re-fuel my ride-on lawnmower for a decade from the same kind of plastic jerry can that people have been discussing? In a number of ways the lawnmower is similar to an aircraft: it's mainly metal on rubber tyres. Link to comment Share on other sites More sharing options...
cscotthendry Posted December 17, 2012 Share Posted December 17, 2012 ahh yes but how does the vapours of the fuel get up that tiny pipe when you are pumping in fresh air? It's not the vapours travelling up the pipe that's the problem, it's the static electricity travelling down the pipe into the jerry can that causes all the trouble Link to comment Share on other sites More sharing options...
fly_tornado Posted December 18, 2012 Share Posted December 18, 2012 that's true, you also need to take into account the very real possibility of being struck by lightning whilst you hold a large steel can over your shoulder. 1 Link to comment Share on other sites More sharing options...
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