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Same here, done on demand of the hydro officials. 
They do high quality work, blasting is done with adequate fine grain, no
damage done. This method was developped to get rid of an inner coating
some of the east german tanks had. Rust could hide underneath
undetected. Don't know whether they use "sand" or glas beads. may ask
next time.
Some feel, once sandblasted, the tanks might be more prone to further
rusting. Not sure 'bout this.
Matthias

sumpcaver@at*.ne* schrieb:
> 
> Hello all,
> 
> It seems that there is a shop in my area that likes to
> sand blast the interior of steel SCUBA cylinders, even
> if there is slight surface rust.  Any idea how the tank
> manufacturers feel on this?  What about the issues of
> work hardening??
> 
> I have sandblasted many different objects with diffent
> media in the past, although one thing I have noticed is
> that blasted objects seemingly look clean and new while
> hiding more oxidation under the surface.
> 
> I will not even get into their policy regarding O2
> cleaning.
> 
> Erik
> sumpcaver@at*.ne*
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