The previous owner left me several metal pipes that were taken off some old oilfield equipment. Some of this piping is quite long. Is it worth my time/effort to cut these pipes down and take them to a metal shop for the money? I could probably get soemone to just come and haul them away and let them get the money. What kind of saw would be best for cutting these pipes? Some of them are pretty thick.

I also have some cement pipes that run under roads. The previous owner installed these for a living. I have a few smaller ones and some of the really big ones. Any idea what I can do with these? Would anyone want to buy these, or should I just get rid of them?