I don't know anyone who uses it for piping analysis. It seems to cover a few codes ASME B31, PD 8010, DNV F101 and it certainly model the pipe, plus coatings, linings and contents. I expect the waveloader also works with the piping analysis.
I just think it is an extra and would do if you have nothing else but as this is what caesar was designed to do thats what gets used.
Maybe some local, one man type consultants, would use it as it saves buying two quite expensive licenses and you can use it for both structural and piping. But that would be a guess.