You need to throw these cylinders out, using the acid ruined them.

   Jim
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> 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 
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