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Jim, I'm not sure where you are coming from here. If the cylinder has passed a hydraulic test, then the pressure vessel is proved sound. Hydrochloric acid is soluable in water, and so easy to remove from the cylinder wall. I can't see what the problem is. Cheers, Gareth ----- 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 1:30 PM Subject: Re: Steel cylinder internal rust > You need to throw these cylinders out, using the acid ruined them. > > Jim > > 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'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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