| Titre : |
Acceptance testing for coatings in insulated service |
| Type de document : |
texte imprimé |
| Auteurs : |
Michael F. Melampy, Auteur |
| Année de publication : |
2017 |
| Article en page(s) : |
p. 34-40 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Corrosion sous isolation
Essais (technologie)
Essais accélérés (technologie)
Revêtements protecteurs
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Corrosion under insulation (CUI) is accelerated corrosion that takes place under insulation that is typically used to conserve energy, help with process control and protect workers from temperature extremes. CUI is an issue for facility owners in many industries that use heat or cold in their industrial processes, including chemical processing, refining, fertilizer manufacturing and power generation. Insulation used in these applications is generally mechanically attached to the substrate vessel or pipeline and is typically covered with cladding. Cladding is most often made of metal or plastic and is applied to protect the insulation from physical damage and to keep water away from the insulation and substrate.
Eventually, water and entrained contaminants can leak through the cladding into the insulation where it can come into contact with the carbon- or stainless-steel substrate. It is widely accepted that corrosion happens more quickly at higher temperatures approaching 212 F (100 C) when a corrosion cell exists, and it is also understood that the electrolytic concentration created by the evaporation of contaminated water in the insulation assembly can lead to accelerated corrosion. Further, process shutdowns, both planned and unplanned, allow for accelerated CUI corrosion.
CUI can result in substantial section loss of substrate materials that can lead to perforation of the piping system of operating equipment. Depending on what is flowing through the equipment, a perforation may result in a high-pressure steam leak or a hydrocarbon liquid or gas leak, which can lead to fires (pool fires and jet fires) and explosions. These leaks can cause significant damage, personal injury, environmental contamination, lost production time and a poor perception of ownership by the public. All of this equates to a substantial cost to the owners and stakeholders of businesses affected. |
| Note de contenu : |
- Coating selection
- Coatings used for cui
- Cui environments
- Testing : Standard weathering testing - Thermal cycling testing - CUI test method - Optional testing
- TABLES : 1. NACE SP0198 summary of table 2 - 2. CUI environmental classifications - 3. Weathering test and duration - 4. Weathering test acceptance criteria - 5. Thermal cycle test and acceptance criteria - 6. Multi-phase CUI cyclic chamber test
- FIGURE : Overview of test equipment with open view of multi-phase CUI test chamber on left |
| En ligne : |
http://www.paintsquare.com/archive/?fuseaction=view&articleid=6026 |
| Format de la ressource électronique : |
Web |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28367 |
in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 3 (03/2017) . - p. 34-40
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Adhésifs. Colles d'origine animale. Méthode d'échantillonnage et d'essai - Norme NF EN ISO 9665 / Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) (2001)
