Corrosion Under Insulation (CUI) Guidelines by S Winnik

By S Winnik

Corrosion-under-insulation (CUI) refers back to the exterior corrosion of piping and vessels that happens beneath externally clad/jacketed insulation due to the penetration of water. by way of its very nature CUI has a tendency to stay undetected till the insulation and cladding/jacketing is got rid of to permit inspection or whilst leaks ensue. CUI is a typical challenge shared by way of the refining, petrochemical, strength, business, onshore and offshore industries.

In the 1st version of this publication released in 2008, the EFC operating events WP13 and WP15 engaged jointly to supply guidance on coping with CUI with contributions from a few ecu refining, petrochemical and offshore businesses. the tips are meant to be used on all crops and deploy that comprise insulated vessels, piping and kit. the ideas hide a risk-based inspection method for CUI, inspection thoughts and instructed most sensible perform for mitigating CUI, together with layout of plant and gear, coatings and using thermal spray ideas, different types of insulation, cladding/jacketing fabrics and safety guards. the tips additionally comprise case studies.

The unique record first released in 2008 was once very profitable and supplied an immense source within the carrying on with conflict to mitigate CUI. Many individuals of the EFC corrosion neighborhood asked an replace and this has taken among 18-24 months to take action. optimistically this revised record will proceed to serve the neighborhood delivering a pragmatic resource of data on tips to video display and deal with insulated systems.

  • Revised and entirely up-to-date technical tips on coping with CUI supplied via EFC operating events WP13 and WP 15
  • Contributions from a couple of ecu refining, petrochemical and offshore companies
  • Extensive appendices that supply extra useful information at the implementation of corrosion-under-insulation top perform, gathered functional services and case studies

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3 Implementation of data validation The simple process described below is one example of doing data validation. 2. 3 so that tasks can be assigned with clear responsibilities. Also, the scope of work for a desk validation is different from an on-site or field validation and may well be executed by different people. Also, on-site validation requires more resources and budget and is likely a part of an investment proposal. Each insulated item appearing on the pre-screen list shall be visually checked for.

1 Consequence of CUI failure The consequence modeling in full quantitative RBI systems tends to be very comprehensive and will provide a refined view of failure consequences. Usually, a total of five consequence categories for economics, health & safety, and the environment are considered. However, this might be different for different operating companies. 8 provides an example of assessed consequences. 2 Probability of CUI failure When the consequence of failure has been established, the probability of failure is determined.

2 Susceptibility factors Score tables can be used to determine the level of CUI or Cl-ESCC susceptibility. ” In this guideline, these key factors have been supplemented by five other factors contributing to the susceptibility to CUI (a total of four for Cl-ESCC). The user may decide to change or add to the susceptibility factors in order to fit specific conditions. The six susceptibility factors used in this guideline are explained below. 1 Operating temperature This is a very important aspect of an item’s susceptibility to CUI.

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