I need to do some math on some pipe sizes. I may need as many as two pipes
within one, perhaps 3. The center one could be SS, or copper, as it would
have no abrasion on it.

Is there a chart where I would compare a bunch of pipe sizes to pick out the
ones I think may work together? I know there are slight variations in sizes
for all reasons, and will probably have to go to several sources. It needs
to be good steel pipe, corrosion and wear resistant grades.

Steve