Corrosion Control Planning
The corrosion plan identifies the locations for potential corrosion mechanisms along with recommendations for preventing corrosion damage from occurring in the process unit. Together with developing integrity operating windows, the corrosion control plan offers a comprehensive approach toward mitigating corrosion-related loss of primary containment in your industries. For example, Susceptible Locations for ESSCC Cracks include
...areas adjacent to penetrations in the insulation that are likely damage sites. Nozzles, Platform supports, Vacuum stiffening rings, piping support clamps are all susceptible locations for ESSCC cracks.
Weep holes in top head reinforcing pads can allow water and chlorides to get behind the repad and concentrate, allowing the cracking to progress undetected. Wax plugs, grease or short lengths of instrument tubing bent in a "goose neck" should be installed in the weep holes to prevent future water ingress. Similarly, ear type of lifting lugs can create a water trap. Since only the sides and bottom of the lug are welded, water can get behind the lug from the top head surface. Lugs should be removed after the vessel is installed.
In short, any locations of water ingress or collection points that can concentrate chlorides are a potential crack location.
An Update on Risk Based Inspection: Bringing Focus On External Corrosion Under Insulation, Stress Corrosion Cracking and Other Damage Mechanisms - NPRA Reliability and Maintenance Conference, 5/22/2012
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