Depends on the nature of the rust. Has it been on the surface only, or
bitten deeply into the structure ?
The nature of corrosion depends a bit on the steel alloy and process of
manufacturing.

A clean surface after the acid cleaning should not have weakened
crossections.
This can be inspected optically, in doubt by ultrasonic. May be more
costly than a new bottle.
Matthias

Jim Cobb schrieb:
> 
> 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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