By S Winnik
Corrosion-under-insulation (CUI) refers back to the exterior corrosion of piping and vessels that happens beneath externally clad/jacketed insulation a result of penetration of water. via its very nature CUI has a tendency to stay undetected until eventually the insulation and cladding/jacketing is got rid of to permit inspection or whilst leaks happen. CUI is a standard challenge shared via the refining, petrochemical, energy, commercial, onshore and offshore industries.
In the 1st version 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 few eu refining, petrochemical and offshore businesses. the information are meant to be used on all vegetation and deploy that comprise insulated vessels, piping and kit. the ideas disguise a risk-based inspection technique for CUI, inspection suggestions and prompt top perform for mitigating CUI, together with layout of plant and kit, coatings and using thermal spray strategies, different types of insulation, cladding/jacketing fabrics and safeguard guards. the ideas additionally comprise case studies.
The unique record first released in 2008 used to be very winning and supplied a big 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. with a bit of luck this revised rfile will proceed to serve the neighborhood delivering a realistic resource of data on tips to display screen and deal with insulated systems.
- Revised and completely up to date technical counsel on coping with CUI supplied by means of EFC operating events WP13 and WP 15
- Contributions from a few ecu refining, petrochemical and offshore companies
- Extensive appendices that supply extra sensible assistance at the implementation of corrosion-under-insulation top perform, gathered functional services and case studies
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Extra resources for Corrosion Under Insulation (CUI) Guidelines (EFC)
Neutron backscattering. Dye penetrant testing. 1. A comprehensive review of non-destructive evaluation techniques has been carried out by MTI  in 1998. 2. 2 Reference 1. Materials Technology Institute, MTI Project 118 Detection of Corrosion Through Insulation, September 1998.
Re-evaluation of the risk. 4 Evaluated risk level: low 1 2 3 4 5 6 Removal of thermal insulation at all critical points with evidence of damage. 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). Evaluation of corroded areas by pit gauge, ultrasonic testing or radiography. Analysis for root cause considering critical points. Reinstatement of use of practices recommended in this document.
Poor condition; severely damaged wet or unknown WPNL2204 Highintegrity design ? 8 An example of a risk matrix to determine the CUI risk of failure from probability and consequence classes CONSEQUENCE CATEGORY H M L N TOTAL TOTAL TOTAL TOTAL SCORE SCORE SCORE SCORE >C B-C A-B 1-A ECONOMICS (2) HEALTH & SAFETY ENVIRONMENT CONSEQUENCE CLASS CUI RISK CLASS L L N N MH M L N H MH M L E H MH M E E H MH NO/SLIGHT DAMAGE NO/SLIGHT INJURY NO/SLIGHT EFFECT MINOR DAMAGE MINOR INJURY MINOR EFFEFT LOCAL DAMAGE MAJOR INJURY LOCALISED EFFECT MAJOR DAMAGE SINGLE FATALITY MAJOR EFFECT EXT.