You should be presenting this picture with your earlier question. Therefore we understood something that is not in your mind. The plate that you highlighted is called stiffener plate not a wear plate.

There are applications that the trunnion is welded on to the pipe/pipe elbows on one side with reinforcing plate and supported by structure on the other side. If you use additional reinforcement pad attachment on the pipe in contact with structural member to reduce the contact stress on the pipe, this pad may be called a wear plate since it may be moving under the thermal loads. Or sometimes the contact stresses are high on the bare pipe, and you can introduce a wear plate to reduce the contact stresses similar to the structural side application on the pipe above.

So in your case the pipe stress/pipe support engineer needs to prove that the secondary stresses on the pipe with reinforcement plate are also adequate with the selected reinforcing pad wall thickness in addition to the adequacy of the trunnion itself to comply with structural code that you are using. So the second paragraph in my previous post is still valid.