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I am also a PSI inspector and I don't recall epoxy linings being illegal. 
If they are in good shape then there is nothing wrong with leaving them
although I recommend removing them. If they appear at all damaged the
lining should be removed using a shot blaster and then the cylinder can be
VIP'ed.
	  As far as steel vs. Al for O2 the increased O2 content can cause
rusting and the rusting uses up the O2 resulting in decreased pO2.  Al
will stop rusting once a surface layer of oxidation has formed but this is
not true for steel it will continue to rust until all the metal present is
oxidized. 

  ooooO         Bob        
 (    )   Ooooo    Favorite              
  \  (   (    )            RVT        
   \  )   )  /                
         (  /

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