Step-Wise Cracking Cause and Detection

Hydrogen blistering refers to the formation of subsurface planar cavities in a metal resulting from excessive internal hydrogen pressure. Growth of near-surface blisters in low-strength metals usually result in surface bulges or step-wise crack. Hence, Step-Wise Crack is advanced stage of HIC where multiple cracks parallel to pipeequipment’s surface link together to form a stair pattern and results a through-thickness crack driven by high levels of stress. Advanced NDT technology utilize for detecting HICBlisters & step-Wise Cracks and support the operating facilities in assessing plant equipment and piping for continued safe operations.

References
1. http://webwormcpt.blogspot.com/2007_09_01_archive.html 2. http://www.google.com.sa/search?q=iso+15156 3. http://www.olympus-ims.com 4. http://www.agr.com/home 5. http://materials-welding.blogspot.com/2010/04/re-mw4672-nace-test-requirements.html 6. ASME B31.8S and ANSI/NACE Standard RP0204-2004 Item No. 21104
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