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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#41
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Drilling and brazing a fuel tank
On Tue, 12 Jul 2011 06:05:48 -0500, Karl Townsend
wrote: On Mon, 11 Jul 2011 21:43:27 -0500, Ignoramus24437 wrote: I sense a little bit of B/S and scare talk here. I think that people whose tanks exploded, did nothing to purge them, had liquids in them, and got punished. In my case, the tank is completely free of liquids (which dried out days ago) and the only thing that it has is vapors, if any. If, say, it has an incredible high concentration of fuel vapors, then, purging the tank by something like 10x the volume of air (from a home vacuum cleaner or compressor for a few minutes), would leave, more or less, nothing as far as vapors are concerned. The volume of the tank is less than 4 CF, and running my 15 CFM compressor for just 5 minutes, would provide about 20 times the volume of air in the tank. You're probably right. But, I'd use the suspenders and belt approach. No fuel plus no O2 = double safe. A garden hose from your car exhaust to the tank only take a couple minutes. Karl A garden hose from the exhaust is NOT going to do the job. For cripes sake - BORROW a CO2 extinguisher if you are too cheap to buy one, and get it refilled when you are finished. Your ass is worth more than 10 bucks!!!! i |
#42
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Drilling and brazing a fuel tank
On Tue, 12 Jul 2011 06:46:46 -0500, Ignoramus15459
wrote: On 2011-07-12, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote: Ignoramus24437 fired this volley in : I sense a little bit of B/S and scare talk here. I think that people whose tanks exploded, did nothing to purge them, had liquids in them, and got punished. Maybe more mis-information than BS. Gasoline tanks are repaired or modified commercially every day, with complete safety. Empty, wash, dry, bake out, and purge with an inert substance. If you can't smell the gasoline, there's not enough present to form an explosive mixture. I agree with every sentence that you wrote. i PURGE WITH AN INERT SUBSTANCE - is the secret - and KEEP IT FULL. Water does not count. You want an inert substance that can absorb and dispurse any traces of fuel vapour, and any trace of oxygen in the tank.oducing a mixture that is too weak by an order of magnitude, to burn. Water can't do this. CO2 can. Argon can. Even Nitrogen can. If using auto exhaust, you need a large (roughly 2 inch ) hose, a well warmed up and properly running engine, and several minutes of purge before starting to weld - with the exhaust still flowing. |
#43
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Drilling and brazing a fuel tank
On Tue, 12 Jul 2011 06:25:02 -0500, jim "sjedgingN0Sp"@m@mwt,net
wrote: Ignoramus24437 wrote: I sense a little bit of B/S and scare talk here. I think that people whose tanks exploded, did nothing to purge them, had liquids in them, and got punished. In my case, the tank is completely free of liquids (which dried out days ago) and the only thing that it has is vapors, if any. If, say, it has an incredible high concentration of fuel vapors, then, purging the tank by something like 10x the volume of air (from a home vacuum cleaner or compressor for a few minutes), would leave, more or less, nothing as far as vapors are concerned. The volume of the tank is less than 4 CF, and running my 15 CFM compressor for just 5 minutes, would provide about 20 times the volume of air in the tank. Actualy the common danger of oxyacetylene welding or cutting on a tank is the potential for accumulating explosive mixtures from the torch itself. People have blown them selves up cutting on tanks that never contained any flammable material. -jim BS. If you are CUTTING the mixture is extremely lean - high in Oxygen - and if there is ANY fuel in the container, it is oxidized by the extra OXYGEN. There is NEVER any leftover acetelene during a cutting operation. You don't (can't) cut with a carburizing flame i |
#45
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Drilling and brazing a fuel tank
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#46
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Drilling and brazing a fuel tank
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#47
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Drilling and brazing a fuel tank
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#48
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Drilling and brazing a fuel tank
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#49
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Drilling and brazing a fuel tank
On Sat, 16 Jul 2011 19:29:34 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote: fired this volley in : Water can't do this. CO2 can. Argon can. Even Nitrogen can. If using auto exhaust, you need a large (roughly 2 inch ) hose, a well warmed up and properly running engine, and several minutes of purge before starting to weld - with the exhaust still flowing. You've never actually done this, have you Clare? LLoyd Lost count how many gas tanks I have repaired. Used exhaust for quite a few years - then started using CO2. Using a garden hose from an auto exhaust, most of the exhaust bypasses the hose unless you pack around it with rags etc. I used to just put the shop exhaust hose over the tailpipe, and connect it to the filler neck withthe tank unit out and let it run a few minutes,until the tank was warm - then start brazing (or soldering) I've tried water too - but unless you are going to arc weld, there is way too much thermal mass.. With CO2, it is DEAD SIMPLE. And the repair can even be made on the car if the leak is not on the top of the tank, you can reach it to clean it, and there is nothing flamable too close to the tank. |
#50
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Drilling and brazing a fuel tank
On Jul 15, 11:04*pm, wrote:
Trust me Iggy - it is STILL a potential bomb. What does a CO2 fire extinguisher refil cost????? A lot more than some dry ice that someone mentioned. Dan |
#51
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Drilling and brazing a fuel tank
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#52
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Drilling and brazing a fuel tank
On Sun, 17 Jul 2011 05:04:48 -0700 (PDT), "
wrote: On Jul 15, 11:04Â*pm, wrote: Trust me Iggy - it is STILL a potential bomb. What does a CO2 fire extinguisher refil cost????? A lot more than some dry ice that someone mentioned. Dan Depends where you are. Getting dry ice in some areas is not nearly as SIMPLE... But yes, if available it will definitely work - and well. |
#53
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Drilling and brazing a fuel tank
On Sun, 17 Jul 2011 07:33:21 -0500, Ignoramus26063
wrote: On 2011-07-17, wrote: On Jul 15, 11:04?pm, wrote: Trust me Iggy - it is STILL a potential bomb. What does a CO2 fire extinguisher refil cost????? A lot more than some dry ice that someone mentioned. And a lot more than filing the tank with water from a garden hose. i Whicm may, or may not, be as safe. |
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