By S Winnik
Corrosion-under-insulation (CUI) refers back to the exterior corrosion of piping and vessels that happens beneath externally clad/jacketed insulation as a result of penetration of water. via its very nature CUI has a tendency to stay undetected till the insulation and cladding/jacketing is got rid of to permit inspection or while leaks take place. CUI is a standard challenge shared by means of the refining, petrochemical, energy, business, onshore and offshore industries.
In the 1st variation of this ebook released in 2008, the EFC operating events WP13 and WP15 engaged jointly to supply instructions on handling CUI with contributions from a couple of eu refining, petrochemical and offshore businesses. the tips are meant to be used on all crops and install that comprise insulated vessels, piping and kit. the information disguise a risk-based inspection technique for CUI, inspection ideas and steered top perform for mitigating CUI, together with layout of plant and gear, coatings and using thermal spray options, forms of insulation, cladding/jacketing fabrics and security guards. the ideas additionally comprise case studies.
The unique rfile first released in 2008 used to be very winning and supplied a big source within the carrying on with conflict to mitigate CUI. Many contributors of the EFC corrosion group asked an replace and this has taken among 18-24 months to take action. optimistically this revised rfile will proceed to serve the group offering a realistic resource of knowledge on the best way to visual display unit and deal with insulated systems.
- Revised and completely up to date technical assistance on dealing with CUI supplied through EFC operating events WP13 and WP 15
- Contributions from a few eu refining, petrochemical and offshore companies
- Extensive appendices that offer extra sensible assistance at the implementation of corrosion-under-insulation most sensible perform, gathered sensible services and case studies
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Extra info for Corrosion Under Insulation (CUI) Guidelines
It is best assessed using susceptibility factors, of which the operating temperature and the external environment (wetting extent and frequency) are the most important. 5 Probability of CUI failure class CUI susceptibility score N L M H 0–2 3–4 5–9 >10 The aim of this section is not to replace existing probability or consequence assessments, but to give an example of the quantitative RBI methodology for CUI. 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.
5 External coil/steam tracing The presence of steam tracing adds to the susceptibility to CUI because it may start leaking and thus provide a source of water for the corrosion process. ). , 100% visual and leak test). Heating medium is controlled and of good quality (noncorrosive/erosive). High integrity design means that all of the three aspects are satisfied. Mean integrity design means that only two out of the three aspects are satisfied. Low integrity design means all other systems. 6 External environment For CUI to occur, water needs to penetrate the insulation material and contact the metal substrate surface.
Iv) Analyze for root cause considering critical points. (v) Reinstate using practices recommended in this document. (vi) Reevaluate the risk. 4 Evaluated risk level: Low (i) Remove thermal insulation at all critical points with evidence of damage. (ii) Complete visual inspection of exposed areas for corrosion and condition of coating as applicable (including dye penetrant or ACFM inspection to check for Cl-ESCC of austenitic stainless steels). (iii) Evaluate corroded areas by pit gauge, ultrasonic testing, or radiography.