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Tool Talk Discussion Forum

testing welded fuel tanks

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Bruce

04-01-2004 20:13:28




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Does anyone have a way of testing a welded fuel tank for leaks? The fill well on the top is to small to transfer the water from tank to tank and air test distorts the tanks. The outlet fitting is 3/8 of in inch.




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Jimmy King

04-02-2004 06:34:28




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 Re: testing welded fuel tanks in reply to Bruce, 04-01-2004 20:13:28  
If you can fill the tank with water and ck. it with air would be the best way with the tank full of water it will not blow up.



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JM

04-01-2004 20:42:33




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 Re: testing welded fuel tanks in reply to Bruce, 04-01-2004 20:13:28  
I would NOT recommend using air to pressure test anything, very dangerous. Only way is to do a hydro. There has to be a way to fill the tank with non combustible, non-flammable liquid and then drain it to clear the tank. If you are only testing too a few psi, air could be applied to the top of the tank as long as its' full of liquid. Best way is to have a small positive displacement pump and pressurize with all liquid and see if it holds. all this sounds very obvious, i know...

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MPK

04-01-2004 20:40:31




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 Re: testing welded fuel tanks in reply to Bruce, 04-01-2004 20:13:28  
In the past I have built and air tested them before I put gas in them. I would put a piece of innertube over the filler hole and put a hose clamp on it and put a screw in type tire valve stem in the outlet hole and put no more than 2 lbs air in for testing. Check it with a tire gauge. With the air in put some soappy water on the seams and they will bubble if they leak. Even a very slow leak will show up.

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Ol Chief

04-02-2004 14:10:42




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 Re: Re: testing welded fuel tanks in reply to MPK, 04-01-2004 20:40:31  
Mpk is correct.If your tanks have flat sides you will be in jeopardy with more than a couple of pounts of pressure because of the following. Example;Assuming your tank is one foot square on any side and you put one psi of air , water or anything else,you wind up with one pound of pressure on each of the 144 sq.inches of flat surface in one sq. foot Now you have a 144 pound load added for each additional pound of pressure introduced.If your tank has more square inches of surface then use that size as the multiple Therefore the surface will bulge outward in all directions on flat surfaces.With more than a couple of pounds pressure you may crack your welds. You do not state what shape tanks are involved.If the tanks are cylindrical with dished heads then that is a horse of a different color.Low air pressure with soap bubbles would be my choice.

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