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 penetration of water. by means 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 while leaks ensue. CUI is a standard challenge shared by means of the refining, petrochemical, strength, business, onshore and offshore industries.
In the 1st version of this booklet released in 2008, the EFC operating events WP13 and WP15 engaged jointly to supply instructions on coping with CUI with contributions from a few eu refining, petrochemical and offshore businesses. the ideas are meant to be used on all crops and deploy that comprise insulated vessels, piping and gear. the ideas disguise a risk-based inspection method for CUI, inspection strategies and advised most sensible perform for mitigating CUI, together with layout of plant and kit, coatings and using thermal spray strategies, varieties of insulation, cladding/jacketing fabrics and safety guards. the tips additionally contain case studies.
The unique record first released in 2008 was once very profitable and supplied an incredible source within the carrying on with conflict to mitigate CUI. Many individuals of the EFC corrosion group asked an replace and this has taken among 18-24 months to take action. expectantly this revised record will proceed to serve the neighborhood delivering a realistic resource of data on the best way to display screen and deal with insulated systems.
- Revised and entirely up to date technical counsel on coping with CUI supplied by way of EFC operating events WP13 and WP 15
- Contributions from a couple of ecu refining, petrochemical and offshore companies
- Extensive appendices that offer extra sensible tips at the implementation of corrosion-under-insulation most sensible perform, gathered useful services and case studies
Read or Download Corrosion Under Insulation (CUI) Guidelines, Second Edition: Revised (European Federation of Corrosion (EFC) Series) PDF
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Extra resources for Corrosion Under Insulation (CUI) Guidelines, Second Edition: Revised (European Federation of Corrosion (EFC) Series)
The choice of whether to focus only on critical locations or do a 100% insulation strip can only be made based on a thorough understanding of the pipe/equipment insulation history. Corrosion-Under-Insulation (CUI) Guidelines: Revised Edition. 00005-6 Copyright © 2016 European Federation of Corrosion. Published by Elsevier. 44 ● Corrosion-Under-Insulation (CUI) Guidelines: Revised Edition Penetrations All penetrations or breaches in the insulation jacketing systems such as dead legs, hangers and other supports, valves and fittings, bolted-on pipe shoes, ladders and platforms, and vessel nameplates attached by welding.
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. (iv) Analyze for root cause considering critical points. (v) Reinstate using practices recommended in this document.
The selection will depend on the scale of any CUI, resources employed, and location/type of plant being considered. ● ● ● ● Individual targeted high safety/health/environment (SHE) risk equipment with known CUI issues. Individual targeted high economic risk equipment with known CUI issues. Individual high risk equipment with potential CUI issues. High risk equipment within a particular area (zone approach). 1 Evaluated risk level: High/extreme (i) 100% removal of thermal insulation. (ii) Complete visual inspection for corrosion and condition of coating as applicable (including dye penetrant or alternating current field measurement (ACFM) inspection to check for Cl-ESCC of austenitic stainless steels).