You need to find out from a tank manufacturer.  Acid will remove rust and
minute amounts of metal, but so does tumbling.  As far an the acid itself,
it is used (very dilute) in some regulator baths.  What I don't get is why
anyone wants to use these dinosaurs in the first place.

jc

----- Original Message -----
From: Jim Cobb <cobber@ci*.co*>
To: Mantis Diving <dive@ma*.co*.au*>; Techdiver@Aquanaut.Com
<techdiver@aquanaut.com>
Sent: Saturday, June 02, 2001 9:30 AM
Subject: Re: Steel cylinder internal rust


> You need to throw these cylinders out, using the acid ruined them.
>
>    Jim
>  -------------------------------------------------------------------
>  Learn About Trimix at http://www.cisatlantic.com/trimix/
>
> > From: Mantis Diving <dive@ma*.co*.au*>
> > Date: Sat, 02 Jun 2001 10:49:38 +1000
> > To: "Techdiver@Aquanaut.Com" <techdiver@aquanaut.com>
> > Subject: Steel cylinder internal rust
> >
> > Hi,
> >
> > I had a diver turn up with some 72's. They were to be hydro'd but there
was
> > internal rust. The diver took them away to clean them and brought them
back
> > a couple of days later rust free.
> >
> > The cylinders were sent for hydro and passed. When the diver picked them
he
> > told me that he had not rumbled them instead he had used Hydrocloric
acid
> > to remove the rust from inside the cylinder. From what I understand the
> > acid breaks the bond between the rust and the steel.
> >
> > My question is apart from the obvious (ensuring that all traces of the
acid
> > are removed from inside the cylinder) is there anything else I need to
be
> > aware of as a gas fill provider. The diver wants to twin them up for 60m
> > dives, as he is a mix diver I am assuming he may request a mix fill at
some
> > point.
> >
> > I would rather not fill them if there are any safety issues.
> >
> > To restate, they were Hydro'd and passed 'after' the acid clean.
> >
> > Paul O'Malley
> > --
> > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
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> >
>
>
> --
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