Re: [PSUBS-MAILIST] welding used steel

["Emile" <2stroke@hetnet.nl>]

Tanks for your Awnsers
My conclusion is that Propane/ butane will outgas more easyly than diesel
and wil not fustrate welding.
Learned some more; I never taught of wat unburnd acytylene can do in a
closed vessel.

Dan,

Purging a tank with car exhaust gasses dont seem me a good idea. There can
be still oxygen present; sure on idle running diesels.
I totally agree with you that a used tank hull is a tip of the iceberg. For
my 2 ton sub plan I sure use new steel but for a large one (the tant I sew
was 30 M^3) it may save time an costs.

Grs, Emile

----- Original Message ----- 
From: "Dan H." <jmachine@adelphia.net>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, April 13, 2004 2:00 PM
Subject: Re: [PSUBS-MAILIST] welding used steel


> I remember being told that running the exhaust from a car or truck into a
> tank to purge out the available oxygen was a way to weld a tank that once
> held flammables.  I never tried it myself but I don't see why it wouldn't
be
> as good as purging with CO2.  That was before cars came with the pollution
> devices though, if that makes a matter or not.
>
> To tell the truth, CO2 or exhaust gases, I just avoid welding or cutting
any
> tanks when flammables were ever involved.  I once saw a five gallon can
blow
> up while a guy tried to grind off the top.  It wasn't pretty!
>
> A propane tank hull isn't as much of a sub as one might think.  It looks
> like a good start but it's only the tip of the iceberg.  After building my
> sub, I see where the cylindrical tube and the two endcaps was about the 5%
> mark of the completed sub.
>
> Don't over estimate starting with a tank.
> Dan H.
>
> ----- Original Message -----
> From: "Warren Greenway" <opensourcesub@yahoo.com>
> To: <personal_submersibles@psubs.org>
> Sent: Saturday, April 10, 2004 9:12 PM
> Subject: Re: [PSUBS-MAILIST] welding used steel
>
>
> > Yes, the tank was filled with CO2 when welding. The
> > tank was flushed out very well before anything was
> > done, then cleaned with degreaser. There were no
> > problems with cutting and welding the tank...Other
> > then
> > the smell, which passed after some time.
> >
> > Warren.
> >
> > --- Fly Deep <flydeep4u@yahoo.com> wrote:
> > >
> > >
> > >
> > >
> > >
> > >
> > > Warren,,,did you use a explosion meter first,,a
> > > sniffer,,or did you just do it and weld on the
> > > pressure vessel...There is a guy down here that
> > > wants to o some welding on two big propane tanks and
> > > I'm a bit nervous,,,I had figured on flooding them
> > > with Co2 first...
> > >
> > > The steel must be cleaned with a de-greasing type
> > > cleaner, but it welds perfectly once surface
> > > cleaned.
> > > I can attest to this from personal experience. The
> > > other thing I can attest to is the smell of an old
> > > and heavily used propane tank once you cut into it!
> > > Wow! There is nothing as potent!
> > >
> > > Warren
> > >
> > > Do you Yahoo!?
> > > Yahoo! Mail - More reliable, more storage, less spam
> >
> >
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