| Titre : |
The compromised propane tank coating |
| Type de document : |
texte imprimé |
| Auteurs : |
Jayson L. Helsel, Auteur ; Richard A. Burgess, Auteur |
| Année de publication : |
2013 |
| Article en page(s) : |
p. 17-21 |
| Langues : |
Américain (ame) |
| Catégories : |
Adhésion
Délaminage
Dureté (matériaux)
Evaluation
Métaux -- Revêtements protecteurs
Réservoirs (récipients) -- revêtements protecteurs
Revêtements -- Défauts:Peinture -- Défauts
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The exterior coating system on six propane tanks was delaminating alter only one year of being stored under cover in Mexico. Could the system be repaired ? Or was it a total loss ?
A gas transmission company had all six of the propane tanks fabricated and coated in Mexico for a U.S. facility. The specified surface preparation was Near-White blast cleaning in accordance with SSPC-SP 10/NACE 2, followed by application of a 100%-solids polyurethane coating system. The coating thickness was specified to be a minimum of 20 mils. Although the coating could have been applied in one coat, preferably by plural-component spray, to meet the specification, the polyurethane could also have been applied in more than one layer if done within a limited recoat window. After completion, the tanks were reportedly stored under cover until shipment to the facility in the northeastern U.S. nearly a year later. After the tanks had arrived on site, problems with the coatings were observed when the tanks were installed on concrete footings. The coatings appeared to be delaminating between layers or between what appeared to be two coating layers and the steel substrate. High-voltage and low-voltage holiday testing performed by the facility owner revealed numerous holidays.
The investigator visited the site to examine the coatings and to determine what repairs were necessary. Additionally, the intended painting contractor for repair work was onsite to "sweep blast" test sections on the tank exterior to help determine the viability of this method as part of a repair procedure. |
| Note de contenu : |
- THE SITE VISIT : Visual assessment - Coating thickness - Coating adhesion - Coating hardness - Test sections
- ANALYSIS OF PROBLEMS |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20722 |
in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 30, N° 11 (11/2013) . - p. 17-21
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The compromised propane tank coating in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 30, N° 11 (11/2013)
