"Peter Hill" <peter.usenet1@[EMAIL PROTECTED]
> wrote in message
news:vdnn7411jpamkp3sk6ao4p62fdehtonepq@[EMAIL PROTECTED]
> On Mon, 14 Jul 2008 16:45:24 +0100, "Badger"
> <brianhatton@[EMAIL PROTECTED]
> wrote:
>
> >
> >"macman" <phootos@[EMAIL PROTECTED]
> wrote in message
>
>news:6e3eb0ce-a789-4f30-b9b9-64b024d1cdf2@[EMAIL PROTECTED]
> >>>
> >>> > Get with some soapy water (or, better, proper gas-leak tester
stuff)
> >>> > and
> >>> > look for bubbles...
> >>>
> >>> I replaced a twin (2 tanks welded together with balance pipes)
system
> >>> recently for a customer, exact same issue, a weld on the balance
pipes
> >>> had
> >>> failed and gone ****ous! When I looked into it, I discovered that
this
> >>> particular tank setup (2 welded together) is no longer made for this
very
> >>> reason - apparently a lot failed.
> >>> If it's a welded set-up, you'll probably have to get a cradle, 2 new
> >>> tanks,
> >>> 2 multivalves, 1 contents sender, 8mm t-piece to split the filler
feed,
> >>> 6mm
> >>> non-return t-piece for the feed out and some 6mm and 8mm gas pipe,
and
> >>> possibly a 8mm to JIC adaptor for the filler.
> >>> Badger.
> >>
> >> Great information thanks very much to all ...
> >>
> >> Badger, was it not possible to re-weld the joint that had failed on
> >> the twin tank set-up?
> >
> >Do you really want me to answer why you shouldn't even be considering
> >welding a rusty pressure vessel full of explosive vapours, whether
under
> >pressure or not????????
> >KA-BOOOOOOOOOOOOOOOOOOOOOOMMM!
> >
> >> Also would it be easier to replace the twin tanks with a single
> >> toroidal tank bolted to the underside of the floor of the truck,
> >> assuming they have died?
> >
> >Depends on vehicle. Customer wanted the same range at minimal cost - 2
40ltr
> >tanks are considerably cheaper than a fancy filled-torroidal even after
> >adding the multivalves into the equation.
> >Badger.
> >
>
> Vac purge and then fill with CO2? Far less risky than welding petrol
> tanks. Petrol tanks the stuff hides in the seams and keeps on
> vapourising.
>
No problems welding petrol tanks, as you say but leave the pipe in the
tank
and continue purging slowly with the inert gas while repairing with
oxy-acetylene. Even if you wasted a full bottle of gas (which you won't),
it's still cheaper than a new tank. Done lots, mostly motorcycle tanks.
Martin
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