By S Winnik
Corrosion-under-insulation (CUI) refers back to the exterior corrosion of piping and vessels that happens beneath externally clad/jacketed insulation end result of the penetration of water. by way of 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 ensue. CUI is a standard challenge shared through the refining, petrochemical, energy, commercial, onshore and offshore industries.
In the 1st variation of this booklet released in 2008, the EFC operating events WP13 and WP15 engaged jointly to supply directions on dealing with CUI with contributions from a few ecu refining, petrochemical and offshore businesses. the ideas are meant to be used on all crops and set up that comprise insulated vessels, piping and kit. the information disguise a risk-based inspection technique for CUI, inspection thoughts and suggested most sensible perform for mitigating CUI, together with layout of plant and kit, coatings and using thermal spray recommendations, forms 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 enormous 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 record will proceed to serve the neighborhood supplying a pragmatic resource of data on the right way to video display and deal with insulated systems.
- Revised and completely up to date technical assistance 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 offer extra sensible assistance at the implementation of corrosion-under-insulation top perform, amassed functional services and case studies
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Extra info for Corrosion Under Insulation (CUI) Guidelines
7 for austenitic stainless steel. It should be noted that these scoring tables are indicative. Depending on local experience and site policies, different scoring tables might be required. The qualitative probability of CUI failure assessment should be combined with a qualitative consequence of CUI failure assessment as described above. 3. The CUI inspection strategy for each of the risk categories is detailed in Chapter 5. 4 Semiquantitative RBI analysis Where semi- or fully quantitative RBI analyses are available either in-house or through commercially available RBI programs, these should be used as far as possible for the assessment of CUI.
These plugs should be promptly replaced and, if necessary, sealed. 3), and other insulated vertical equipment are detailed as follows: ● ● ● ● Termination of insulation at flanges. Insulation rings, particularly top and bottom heads of vertical vessels. Stiffening rings for vacuum design (vessel or column). 5 m under the weld of skirt (vessel or column). 46 Corrosion-Under-Insulation (CUI) Guidelines: Revised Edition Head nozzles, top Top platform supports Lifting lugs Davits Inspection openings unrepaired Platform, ladder brackets Large nozzle or manway Insulation thickness Stiffening ring, exposed Stiffening or support ring, hidden Small gussetted connections Support ring, off wall Vessel support brackets On-vessel pipe brackets, guides Fireproofing, vessel support Check list: 1.
00006-8 Copyright © 2016 European Federation of Corrosion. Published by Elsevier. Limitations, advantages, and disadvantages of different NDE/NDT techniques for CUI NDE/NDT technique Advantages Disadvantages Comments External/visual inspection Requires removal of insulation—“strip off and inspect” Can see the problem— positively identifies all areas of CUI Can apply a range of tools to quantify the problem Gives confidence - Expensive and requires other techniques to quantify metal loss - Cannot directly measure remaining wall thickness External/visual inspection without removing insulation - Generally carried out as a first pass and is usually limited by access - Very easy to cut windows Little cost for an initial evaluation Only covers small areas, will only provide a guide to potential problem areas Ultrasonic thickness measurement through inspection openings Ultrasonic thickness measurement Only a very small area is inspected It gives remaining wall thickness NB: UT measurements can be very effective for general CUI when taken internally It can be difficult to obtain readings on a corroded surface The most effective inspection method If insulation is removed on a sample basis, may not strip off “worst areas” and may give false confidence Can be very effective for a first pass on an installation with a CUI program Windows can be a source of water ingress Generally not used for CUI Requires removal of insulation and limited by surface condition It gives remaining wall thickness following external and internal corrosion Can be difficult to obtain thickness readings on a corroded surface.
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