SUMMARY

This report illustrates the following:

• In bacterial contaminated waters containing relatively low chlorides, failures may occur too rapidly (in terms of a few months) to be explained by conventional chloride crevice corrosion.

• Stagnant water conditions may result in MIC in welded stainless steel components, if the water is not removed following hydrotesting.

• Non-pathogenic microbes, which are not removed from domestic drinking (potable grade water), may cause MIC.

• The morphology of the MIC failed components is consistent with localized corrosion and pitting at or adjacent to austenitic stainless steel welds.

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