If pitting intensity is higher than 15% in area (see figure 5), thickness measurement
shall be taken to check pitting corrosion.
The minimum acceptable remaining thickness in pits or grooves
is equal to:
-
.1 75% of the as-built thickness, for pitting
or grooving in the frame and brackets webs and flanges; and
-
.2 70% of the as-built thickness, for pitting
or grooving in the side shell, hopper tank and topside tank plating
attached to the side frame, over a width up to 30 mm from each side
of it.