And, bottom line from that paper, was a decrease in wall thickness at the outside of the 90 bend from 18 mm (baseline) to 16 mm.
Generic issue for all pipes in all circumstances under all fluids and pressures and flowrates, will be, over time, how much additional material will be removed from the inside of the pipe at that point from erosion and corrosion? As the "original" 16 mm pipe wall becomes 14 mm, 12, 10 ... when will the fluid break through?