> There certainly should be a lot of rules in place not to have the public sharing the elevator with large shipments of liquid chemicals such as those planned for transport within a particular public building I'm thinking of. 

According to the DCHAS-L archives at
http://www.ilpi.com/dchas/
there are two major threads related to transportation of chemicals on elevators, one related to liquid nitrogen the other to hazardous chemicals in general. The topic also came up in a discussion of laboratory design issues. The discussion revolved around best practices and practical considerations, rather than regulatory requirements.

I suspect that the fire code is the most likely place to find authoritative guidance on this topic and I don't remember seeing a discussion of this specific issue in any of the fire codes that I have looked at. Perhaps the Authority Having Jurisdiction for a specific building would be worth consulting?

- Ralph

Ralph Stuart, CIH, CCHO
membership**At_Symbol_Here**dchas.org

Membership chair
American Chemical Society