Is the saddle welded interely to the pipe or just with evenly spaced long tack welds?
In the first case, I see no danger at all. In the second case, if the weld is outdoors, rainwater will remain trapped between the saddle and the pipe.
In this case, three remedies are possible:
1. Weld the saddle interely to the pipe.
2. Caulk the clearance between the saddle and the pipe with a suitable product.
3. Paint the the areas of the saddle and the pipe that are in contact with a suitable water resisting paint.
Are there reliable water resistant paints? Yes, there are. Ask your paint supplier for help.
Giovanni S. Crisi
Sao Paulo - Brazil
One concern I would have is creating a transverse stress/strain along the ID toe line. In effect, the saddle would contact the OD weld and push inward along the contact. This would be augmented by the hoop stress when the pipe is under pressure. Stress cycling could promote fatigue crack initiation where the overstress is superimposed. If I were the Client, the weld absolutely would have been ground within 1/16" of flush.