SamAbdul,

Your type 1 is just a doubler or wear pad, normally used beneath a resting line to better distribute concentrated loads.

Trunnion type 2 ... If the load is mostly axial along the trunnion, a pad without a hole is ok, functioning much like 1 above, since you are then dealing mainly with punching shear at the pipe wall / trunnion interface. However if there are significant bending loads, the same welding philosophy as a ring reinforced tee, i.e. a fully welded ring is far superior. To explain this, consider the same connection but with the trunnion welded only to the pad, which is then welded to the pipe. The tensile side of a bending load will tend to pull the pad away from the pipe. This will bend the pad causing a tensile stress at the the back of what is an uncontrolled fillet weld. That is potentially a massive stress concentration, dependent upon the pad proportions. If cyclically loaded, rapid weld failure may occur.

So IMHO, stick to your existing type 2 construction detail.