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-   SV Talk, Tuning & Tweaking (http://forums.sv650.org/forumdisplay.php?f=111)
-   -   fuel tank crack (http://forums.sv650.org/showthread.php?t=133196)

vardypeeps 05-06-09 11:11 AM
Re: fuel tank crack
 
Quote:
Originally Posted by Dicky Ticker (Post 1931655)
As a side comment--I have a 4" scar on my chin where a tank blew up after welding
The tank had been drained and left overnight full of water,drained before welding but the tank itself held residual vapours which exploded on contact with the torch. It is very difficult to completely purge the vapours.

Leave the tank almost full of water when you weld it as this reduces any petrol vapour to a minimum and flash it before welding

You could try liquid metal as an alternative to the other stuff suggested.
Just on that about vapours.
What if you got a good seal with a vac and sucked the air for 5/10 mins???
Might that work?

Sir Trev 05-06-09 11:23 AM
Re: fuel tank crack
 
Fuel vapours whizzing round a hot vacuum cleaner's motor... No thanks!!!!!

dirtydog 05-06-09 11:37 AM
Re: fuel tank crack
 
Quote:
Originally Posted by Stu (Post 1931789)
Will the real Blue_SV650 please stand up, please stand up

:lol:

:lol::lol::lol:

Stu 05-06-09 01:38 PM
Re: fuel tank crack
 
Quote:
Originally Posted by vardypeeps (Post 1931810)
Just on that about vapours.
What if you got a good seal with a vac and sucked the air for 5/10 mins???
Might that work?
A vacuum cleaner will not be strong enough to create a perfect vacuum in the tank. You would have more luck blowing air into the tank to allow the fuel/air mixture to blow out

Dicky Ticker 05-06-09 02:48 PM
Re: fuel tank crack
 
DD unfortunately time was of the essence and I didn't have the luxury of leaving it standing.

Dicky Ticker 05-06-09 02:54 PM
Re: fuel tank crack
 
The metal itself retains vapours over time i.e becomes porous and absorbs minute amount of fuel,therefore by leaving water in it you eliminate a large percentage of the area likely to get hot and release vapours.

Sosha 05-06-09 03:10 PM
Re: fuel tank crack
 
Someone I knew used to fillem wth fire extiguisher foam on the basis that "If it's full of foam there's not going to be any vapour"

No idea whether this is wise or not - or how he went about cleaning up after.

yorkie_chris 05-06-09 04:34 PM
Re: fuel tank crack
 
Quote:
Originally Posted by Dicky Ticker (Post 1932131)
The metal itself retains vapours over time i.e becomes porous and absorbs minute amount of fuel,therefore by leaving water in it you eliminate a large percentage of the area likely to get hot and release vapours.
Also remember fuel doesn't burn, it needs air. If it's full of water you minimise the air present to fuel an explosion, even if fuel sat on top of the water burns it isn't going to do any harm compared to 17l of fuel air mix going off at once.

Quote:
Originally Posted by Sosha (Post 1932156)
Someone I knew used to fillem wth fire extiguisher foam on the basis that "If it's full of foam there's not going to be any vapour"

No idea whether this is wise or not - or how he went about cleaning up after.
That would work. Again, displace the air.

I've used water and blown them full of CO2 or argon. No air, no bang.


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