What are the design conditions? Which piping code? What else is part of the assembly? Control valves? Filter housings? Heat exchangers? If this is hydraulics, then the TSSA doesn't look at it. If it's pneumatic, then any components over 3/4" will fall under the pressure piping codes.
If this piping assembly needs to meet the pressure piping code requirements in Ontario, and is being assembled here then it'll need to have its' design & spec registered with the TSSA, be assembled by an authorized shop, and they'll have to witness the pressure test. If it's coming in from outside of the province (assembled in another jurisdiction), I'm not sure what needs to done, but I'd check into it before I ordered anything.