Hanging sprinkler pipe to sprinkler pipe - Code infringement, or not?

[mannyman]

I have seen this in a high-rise building...35 floors typical. Pipe hanging to pipe, with bent rods. I know bending rods is forbidden. But pipe to pipe? We know pipe is not structural. Is there any specific code other than 9.2.1.3.1 (NFPA 13-2013) that refers to this type of practice?
I think this is not proper practice, but before taking this further and possibly defaming another sprinkler company, I need some backup resources. BTW. This floor has less than 175psi system pressure...other floors have 230 psi inlet pressure leading to PRVs...just saying.

 

[cdafd]

2013

A.9.1.1.8.1

The rules covering the hanging of sprinkler piping take into consideration the weight of water-filled pipe plus a safety factor. No allowance has been made for the hanging of non-system components from sprinkler piping. NFPA 13 provides the option to support sprinkler piping from other sprinkler piping where the requirements of 9.1.1.2 are met.