Nozzle Loads for Injection Package

It depends somewhat upon the rating of the pressure flange at whatever temperature the process runs at, as piping connections de-rate with temperature; whatever is the lowest pressure rating of this and the other components at this temperature will be the answer.

If in doubt, ask a local Process Engineer to help out.

You need to explain your set-up in more detail. It sounds like a RF blind flange with a 1/2" NPT threaded hole, bolted to a pipe flange. If so, you don't give the main pipe size. Is the pipe horizontal, vertical or at some other angle?

It's not unusual for specifiers (in this case your client) to say their pipe connections (for horizontal pipes) are designed to take vertical loads only, not horizontal loads, or bending or torsional moments. If that's the case, you could ask the client what load he can accept, and by adequately supporting your pipe ensure you comply.

Unless the client's pipe supports limit it to something lower, the vertical force is determined by the allowable shear stress in the pipe wall. If the main pipe is a fair size, it's unlikely loads from your 1/2" pipe will cause a problem.