(searching through some dust in the brain)
SX piping systems, originating from Edmeston materials engineering, Spec ASTM 312 tolorances ASTM A 530, approval through ASME code case 2029-2. I Believe TUV has had a hand in it somewhere as well.
http://www.edmeston.com/business_areas/sulphuric/index.shtmlI've only seen it once, and that was a demonstration. So I can't claim a whole a lot of knowledge. Initial data looks really good though.
Let me know if this helps.
Regards,
Gerald