Nancy:
We had a similar issue of the pipe systems in the 1929 Ambassador's residence in Prague, Czech Republic which is now undergoing renovation. The architect of record recommended using an epoxy lining system. They may be able to give you specifics on specifications, manufacturer, process, etc.
Architect is EYP, Inc (Einhorn, Yaffee, Prescott)
NanoFab East
257 Fuller Road - 1st Floor
Albany, New York 12203
Tel;518.795.3800
eypae.com
-------------------------------------------
James Vandenberg AIA
US Dept of State
Kabul, Afghanistan
-------------------------------------------