European Tanks

On Fri, 31 Dec 2004 13:16:52 -0600, "Grumman-581"
<grumman581-YYYY-MM@charter.net> wrote:

>"LaBomba182" wrote ...
>> Underwater Kinetics used to make boots like that as I recall.
>
>Interesting... These have "SPIRO" molded into them... They're an interesting
>concept, I guess... The axle probably needs to be lubed a bit since it
>doesn't roll that readily... Perhaps with the extra weight of the air fill,
>it might... On the other hand, it might make a good flower pot... <grin>
>
Bit like fishy then

--
Steve Barlow
Happy New Year to you lot over there..early I know

Grumman-581 wrote:

> "Matthias Voss" wrote ...
>
>>I don't expect them to be galvanized.
>>The better ones of europeen tanks tend to be sandblasted, then hot zinc
>>sprayed, then laquered. If in doubt, I would check the paint thickness
>>using an ultrasonic gauge.
>
>
> Definitely looks like galvanizing... They look just like my steel-72s after
> having been gone over with the wire brush attachment to the angle grinder...


Can you put a pic somewhere?
I once tried but failed to have steels galvanized, the compony would not
do it.
They said the bottle was to be dipped into a hot zinc bath of 450+
Centigrades.
Now this would remove most of the strength given by the heat treatment
of the steel.



>
>>Obviously french design.
>
>
> Why, because the French are too lazy to carry their tanks nomally?

It's prolly a relic from the horseshoe collar BC days, where you had the
harness attached to the bottle.

Matthias

On Mon, 03 Jan 2005 15:40:42 +0100, Matthias Voss <spammat.voss@gmx.de> wrote:
<snip>
>I once tried but failed to have steels galvanized, the compony would not
>do it.
>They said the bottle was to be dipped into a hot zinc bath of 450+
>Centigrades.
>Now this would remove most of the strength given by the heat treatment
>of the steel.

I got my Cold Galvanized with a product called Zinga.
http://www.zinga-uk.com/
The tanks were shotblasted then sprayed. The reaction was only completed when
exposed to high humidity.

They have lasted well so far.

--
Steve Barlow

"Grumman-581" wrote ...
> Hmmm... That URL got wrapped... Let me try again...
<snip>

Nope... Still didn't work... Oh well, cut and paste it into your browser...

Grumman-581 wrote:
> "Matthias Voss" wrote ...
>
>>Can you put a pic somewhere?
>
>
> Of the steel-72s? Oh, ok... I just so happen to have some of them on my web
> server... Here one, try this URL:
>
> http://www.narcosis-republic.us/Show...004-12/steel-s
> cuba-tanks/DCP_1368.jpg

What believe to I see here, is a relatively fine and even layer of zinc.
Whith the hot dipped type, you should be able to see a "crystallic
structure, a bit like frozen ice on a windowpane, where you can see big
flat crystals.

This looks more like hot sprayed zinc, where zinc powder is melted down
by a flame, and blasted onto the freshly sandblasted ( SA3) steel
surface; or like galvanized ( huh, you were writing that already) steel,
where to my knowldege temperatures are much more milder.

Do you know how thick the coating is?

>
>
>>I once tried but failed to have steels galvanized,
>>the compony would not do it.
>>They said the bottle was to be dipped into a hot
>>zinc bath of 450+ Centigrades.
>>Now this would remove most of the strength
>>given by the heat treatment of the steel.

This is hot dipped, not the "galvanized" stuff you probably use.
We do mostly hot dipping, may be becuase it gives a thicker coat, and is
less succeptible to environmental problems.

Matthias

Matthias Voss wrote:



> We do mostly hot dipping, may be becuase it gives a thicker coat, and is
> less succeptible to environmental problems.


I feel obliged to add, in construction works, not in scuba tanks.

Matthias

"Matthias Voss" wote ...
> Do you know how thick the coating is?

Nope, but a angle grinder with a steel brush attachment does not take it
off, it just polishes it up a bit... The tanks were originally manufactured
/ first hydro anywhere from 1970-1972... I had previously thought that I had
one as early as 1969, but no such luck...Some of them had a bit of oxidation
underneath the boot, but the angle grinder wire brush removed it... One of
them had been coated in some sort of rubber / epoxy coating... It was quite
messy to remove it with the angle grinder wire brush...

Matthias Voss wrote ...
>This looks more like hot sprayed zinc, where zinc
> powder is melted down by a flame, and blasted
> onto the freshly sandblasted ( SA3) steel surface;
> or like galvanized ( huh, you were writing that
> already) steel, where to my knowldege temperatures
> are much more milder.

I spent today cleaning up the two new tanks... Instead of using an
angle grinder with a wire brush on them (which would have definitely
been quicker), I used my power washer (somewhere around 2400-2700 psi,
IIRC)... It would flake the paint off the tank and leave a nice brand
new galvanized looking surface underneath it... I knew that I was going
to be getting wet in the process, so I was wearing flops and shorts...
Found out that those chips of paint kind of sting on bare skin...
Finished up most of it except for a small area underneath each boot
that I could get down to the primer, but not all the way to the metal
before it got too dark outside to see anymore... I'll work on it some
more tomorrow, perhaps using the wire brush on the angle grinder for
any stubborn areas... Looks like I'm going to be needing a new valve on
one of the tanks... It appears that it was dropped on the valve enough
to dent it enough that the DIN to yoke converter cannot be removed... A
yoke might even not seat correctly on it either even if I left the
converter in there... Not sure if this was the condition of the tank
initially or it got damaged in the FedEx shipping... It wasn't boxed
up, it was just shipped with a label on the tank... Well, I had been
considering getting a manifold for it anyway... Just got to find one
with M25 threads...

Yes it could if you had a booster and a good filtering system

"CrazyFrenchMan" wrote ...
> Yes it could if you had a booster and a good filtering system

But they're probably as expensive as just a HP air pump, aren't they?