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Brent, Jim,
Thanks, One time I made a small little wood stove out of a 7 gallon
propane tank, It took a really long time to burn that propane smell out of
there. I think the perfume they add to the propane is the main thing that
tends to stay with the metal, propane by itself doesn't have any smell I don't
believe. Isn't Peter Madsens subs, Kraka and the new one both made using
mild steel? If I went with a small diameter - 4' with reenforcing rings
and stayed above 80 feet it might be do-able, I'll have to do the calculations
on something like that.
The outside
of this diesel storage tank has been protected by paint and the inside has been
basically protected by the diesel. The owner tells me that if they would
have scrapped it out a year ago they would have made some money on it, now the
value has dropped considerably, so I might be able to get the material pretty
cheap.
Brian
My welding
fabricator relative did some welding repairs on a large old diesel tank not
that long ago and had no issues welding thru hulls into
it.
Brian the
tank you mentioned might be able to be used for an ambient sub or a air
holding fairing for a 1 atm sub.
I've been
recently told by a ship builder and firefighter guy I know, that
steel will absorb some propane in propane tanks over time. Of course those
tanks are usually put to a much higher pressure then a diesel tank, so that
aids in the propane's absorption.
I
suggested that after a propane tank or diesel tank hull had all the welding
finished on it, that the whole weldment could be heat treated to remove any
remaining fuel in the steel and stress relieve the weldment, and he thought
that would work just fine. For another option it was suggested to me
that you could just use a rose bud torch to just heat up the tank enough to
remove the small amount of fuel infused into the steel. This is of
course well after the tank has been properly ventilated and opened
up.
I've heard
of a number of ways to safely cut into a used propane tank, like filling
it mostly full with water and then running CO2 or a cars exhaust in thru the
top of it. But I was just told about another option that sounded good to me
and was interested in what you guys thought of it.
First you
open all the existing plugs and valves and ventilate the tank with air blowing
thru it for a week. For doing this you could just use a small squirel cage fan
with a hose attached to it. Then you reinstall all but one of the top plugs
and valves and fill the tank with water. Then you cut your first large hull
opening with a plasma cutter. I was told that with water on the back side
of a cut, that the plasma cutter will not cut all the way thru the steel, but
very close to it. So then all you have to do is hit the cut out plate
with a hammer, and thru it goes. Any thoughts?
Regards,
Szybowski
> From:
emile@airesearch.nl
> To: personal_submersibles@psubs.org
>
Subject: RE: [PSUBS-MAILIST] Diesel storage tank
> Date: Sun, 14 Jun
2009 16:14:02 +0200
>
> Brian,
>
> It seems not but
steel has some porosity.
>
> If you ask an old shipbuilder, he
will say that it is not possible to weld a
> tank that contained Diesel
for years.
>
> Emile
>
> -----Oorspronkelijk
bericht-----
> Van: owner-personal_submersibles@psubs.org
>
[mailto:owner-personal_submersibles@psubs.org] Namens Brian Cox
>
Verzonden: zaterdag 13 juni 2009 15:13
> Aan:
Personal_Submersibles@Psubs. Org
> Onderwerp: [PSUBS-MAILIST] Diesel
storage tank
>
> Hi All,
> Where I'm constructing my sub
they are tearing down a old diesel
> storage tank. Could this material
still be used in the construction of a
> sub? It is only mild steel so
it would be limited to shallow water. Would
> the exposure to diesel on
the metal over many years effect the metal? Could
> it be cleaned up?
This tank is probably 50' high and 100' in diameter.
>
>
Brian
>
>
>
>
>
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