Select this option if the pitting corrosion propagates by the growth of existing pits or the formation of new pits. This corrosion method results in an increase in the pit density, that is the spacing between pits decreases. Enter the pit corrosion rate in Pit Spacing (PPRpit-spa).
This option is only available when Flaw Type is set to Part 6 (Pitting) and Assessment Level is set to Level 2 Only or Level 1 and Level 2.