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Corrosion Under Insulation on Industrial Piping – A Holistic Approach to Insulation System Design

Corrosion Under Insulation (CUI) on industrial piping is a major issue for oil and gas industry. The potential influence of applied thermal and acoustic insulation materials is normally assessed through a series of individual laboratory tests on the insulation materials themselves but very rarely on the applied system. Moreover the tested physical values do not necessarily and readily reflect the potential influence that a given insulation material or system has on the risk of CUI.A more sophisticated approach is proposed which takes into account not only the applied insulation system but also the CUI failure behaviour and water or water vapour ingress and retention processes. This approach allows the individual risk assessment of the applied insulation systems against different scenarios of water ingress to be performed. Other influencing factors for the risk assessment include the configuration of the insulation system (e.g. insulation materials aluminium barrier foil outside claddings) and specified construction or installation methods.It is hoped that the approach proposed in this paper will enable the reader to improve their knowledge of insulation materials and their influence on CUI risk and furthermore be able to better identify vulnerable areas on the facility where CUI is likely to occur thereby allowing appropriate CUI management strategies to be developed and implemented.

Product Number: 51319-13042-SG
Author: Mark Swift
Publication Date: 2019
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