Deployment of a Practical CUI/CUF Assessment Tool for Pressure Vessels and Piping Systems

Corrosion Under Insulation (CUI) and Corrosion Under Fireproofing (CUF) continue to represent significant challenges to asset owners when it comes to deployment of a robust and reliable approach by which these damage mechanisms can be identified and categorized in a timely and cost effective fashion. While existing methods such as Guided Wave Testing (GWT) have of late provided a solution for detection of CUI on straight run piping, the approach has proven less attractive when applied to short-run piping found in most processing facilities. On the other hand, most asset operators have to rely on the more rudimentary approach of stripping insulation from tanks and vessels to detect and mitigate CUI/CUF or relying on certain indicators to identify locations that should be stripped. Both these approaches are becoming more and more cost prohibitive while proving to lack any consistent reliability on which to base a systematic program. It is in such an environment that the more recently developed Russell NDE Systems (Bracelet Probe) / HSI E-CATâ„¢ (Electromagnetic Condition Assessment Tool) is being deployed. The system allows for active scanning on insulated surfaces ranging from small-bore piping to flat plates (large diameter tank and vessel application), while maintaining a viable level of sensitivity to relevant CUI/CUF damage.

References

(1) De Vogelaere, F., 2009, “Corrosion Under Insulation”, Process Safety Progress, 28(1), pp 30-35.

(2) Shakeri, E., Khan, F., and Ahmed, S., 2016, “Probabilistic Modeling of Pitting Corrosion in Insulated Components Operating in Offshore Facilities” ASME Journal of Risk and Uncertainty In Engineering Systems, Part B: Mechanical Engineering, 3(1).

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(4) Bernard Jr., P.L., Bork, U., and McDonald, J., March 2016, “Lessons from Development of a Coating for CUI Protection”, Corrosion 2016 - Proceedings, Vancouver, BC Canada.

(5) Simonetti, F., Nagy, P.B., Bejjavarapu, S.M., Instanes, G.,  and Pederson, A.O., March 2015, “Long-Range Microwave Detection of Wet Insulation for CUI Mitigation”, Corrosion 2015 – Proceedings, Dallas, TX USA.

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(7) Silva, I.C., Santos, Y.T.B., Batista, L.S., and Claudia, T.F., October 2014, “Corrosion Inspection Using Pulsed Eddy Current”, 11th European Conference on Non-Destructive Testing (ECNDT 2014), Prague, Czech Republic.

(8) Galbraith, J.M., March 2000, “A New Inspection Technology for Detecting Corrosion Under Insulation”, Corrosion 2000 - Proceedings, Orlando, FL USA.

(9) Crouzen, P, and Munns, I, 2006, “Pulsed Eddy Current Corrosion Monitoring in Refineries and Oil Production Facilities – Experience at Shell”, 9th European Conference on Non-Destructive Testing (ECNDT 2006) –Proceedings, Berlin, Germany.

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