The March 2006 issue of Pumps & Systems magazine has an article on using Belleville springs - but for live loading of valve packing. Still interesting. It's written by Fran Pugliese of Solon Manufacturing. The article and others are posted on their web site - wwwsolonmfg.com.

The article states how they can be stacked with different orientations (concave up or concave down) to adjust stiffness. There's a good list of references too.

I learned of these a few years ago. A CAESAR II user mentioned using these disk springs under pumps to "soften" the vertical thermal loads on their nozzles. I don't see how these could be used as pipe supports.