[article]
Titre : |
Elevated water tank coating warranty repairs : Coating condition evaluations and a difference of opinion |
Type de document : |
texte imprimé |
Auteurs : |
Cynthia O'Malley, Auteur |
Année de publication : |
2017 |
Article en page(s) : |
p. 12-16 |
Langues : |
Américain (ame) |
Catégories : |
Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Anticorrosion Châteaux d'eau Expertises Métaux -- Revêtements protecteurs Réservoirs (récipients) -- revêtements protecteurs Revêtements -- Analyse:Peinture -- Analyse
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Index. décimale : |
667.9 Revêtements et enduits |
Résumé : |
A 1930s-era riveted steel tank with a capacity of 1.5 million gallons was one of the largest water tanks in the world at the time of its construction. A radial cone-design tank with a 6-foot-diameter riser and 20 legs, it is approximately 175 feet in height and 80 feet in diameter. The available painting history indicated the tank was fully painted in 1986 and touched up in 1996. The tank exterior was abrasive blast-cleaned and painted in 2009.
The controlling specification, “Cleaning, Painting, and Miscellaneous Repairs of 1.5 Million Gallon Steel Elevated Water Storage Tank,” required that all exterior surfaces be blast-cleaned to a commercial grade in accordance with SSPC-SP 6, “Commercial Blast Cleaning,” but it provided a description of commercial blast-cleaning from an outdated version of SSPC-SP 6 (September 15, 1994). The specification went on to state that, “where questions arise regarding the degree of cleaning performed, pictorial standards of the Steel Structures Painting Council, Guide to Visual Standard No. 1 shall be used”. It should be noted that the reference pictures in the visual guide did not change between the time the outdated version of SSPC-SP 6 was in effect and the time the current version of SSPC-SP 6 was issued, which, incidentally, preceded the date the contract became effective. |
Note de contenu : |
- Field investigation
- TABLE : Rust grades
- FIGURES : 1. The coating on the support structure, including the tank legs and associated steel below the balcony level, was found to be in excellent condition - 2. Though the coating on the support structure was mostly in excellent condition, there were random runs and sags found in some areas - 3. The tank shell and under the roof overhang exhibited random peeling of the topcoat and intermediate coat - 4. Some minor rust stairing was evident due to cracking of the coating - 5. Cross-cut adhesion testing was performed in 11 locations on the tank shell, roof and balcony |
En ligne : |
http://www.paintsquare.com/archive/?fuseaction=view&articleid=6010 |
Format de la ressource électronique : |
Web |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28370 |
in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 2 (02/2017) . - p. 12-16
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