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Elevated water tank coating warranty repairs / Cynthia O'Malley in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 2 (02/2017)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 2 (02/2017) . - p. 12-16 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 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with SSPC-SP 6, “Commercial Blast Cleaning,” but it provided a description of commercial blast-cleaning from an outdated version of SSPC-SP 6 (September 15, 1994).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 It should be noted that the reference pictures in the visual guide did not change between the time the outdated version of SSPC-SP 6 was in effect and the time the current version of SSPC-SP 6 was issued, which, incidentally, preceded the date the contract became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 [article]

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Climate control in shipyards / Don Schnell in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 2 (02/2017)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 2 (02/2017) . - p. 22-28 Titre : Climate control in shipyards Type de document : texte imprimé Auteurs : Don Schnell, Auteur Année de publication : 2017 Article en page(s) : p. 22-28 Langues : Américain (ame) Catégories : Adsorption Air -- Humidité Chantiers navals Climat Construction métallique Construction navale Hydrostabilité Métaux -- Revêtements:Métaux -- Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : Desiccant dehumidifiers have been used in shipyards since the 1980s to control humidity and to preserve blast-cleaned surfaces during coatings application. They work by utilizing a cylindrical rotor saturated with silica gel or a similar desiccant material to adsorb moisture from the air stream. Some of the earliest applications used 9,000 cfm desiccant units with post-cooling coils that circulated sea water to temper the air going into the ship. Electric heat and cooling has also been utilized for years to control surface temperatures and create suitable working conditions during dry-dock work. Desiccant dehumidifiers have also long been employed to control corrosion during extended lay-ups. Very specialized small dehumidifiers were developed to control corrosion in reduction gear boxes on Navy ships while out of service. Note de contenu : - Changes in industry needs - Innovations of the past decade - Preservation and storage of marine engines - Best practices by geographic region : Northern climates : using heat during surface preparation and coating application - The Mid-Atlantic : Hybrid dehumidifiers and combined systems solve problems during aircraft carrier drydockings - The gulf coast and Florida : cooling plays a big role in climate control - The Northwest : weather is a constant threat to acceptable application conditions - CLIMATE CONTROL ON FLIGHT DECKS : LOGISTIC, POWER AND SPECIFICATION UNIFORMITY En ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6014 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28371 [article]

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Polyurethane pipeline coatings / Stuart G. Croll in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 2 (02/2017)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 2 (02/2017) . - p. 30-42 Titre : Polyurethane pipeline coatings : Do changes in appearance indicate changes in performance ? Type de document : texte imprimé Auteurs : Stuart G. Croll, Auteur ; Chunju Gu, Auteur ; Vinod Upadhyay, Auteur ; Brent D. Keil, Auteur Année de publication : 2017 Article en page(s) : p. 30-42 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composés aromatiques Essais accélérés (technologie) Pipelines -- Revêtements protecteurs Polyuréthanes Revêtements protecteurs -- Détérioration Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Seel water pipelines are intended to be in service for many decades and are protected against corrosion from ground water by cathodic protection and by thick organic polymer coatings. The most common protective coating is a single, thick (> 0.75 mm) layer of an aromatic polyurethane. These coatings are 100-percent solids, two-component spray-applied coatings that cure in less than 30 seconds under normal ambient conditions. Other types of coatings are sometimes used but do not provide the same balance of performance and economy. Occasionally, coated sections of a pipeline may be stored aboveground for an extended period prior to burial and, depending on the local climate, these aromatic polyurethanes rapidly and obviously lose gloss and change color. Inevitably, the substantial changes in appearance cause questions about the corrosion protective abilities of the coating. Upon oxidation, gloss is diminished considerably by the increase in surface roughness that occurs as a coating polymer is randomly eroded. Aromatic polyurethane polymers also become yellow and occasionally a pigment will be bleached by sunlight. After extended oxidation, coatings may chalk with a surface that has become degraded to the extent that it is powdery and almost white. Note de contenu : - EXPERIMENTAL DETAILS - RESULTS AND DISCUSSION : Overall appearance - Gloss - Color - Thickness loss - Electrochemical impedance spectroscopy - FIGURES : 1. Exemplar images of different coatings showing how appearance changed after one month in accelerated weathering. The exposed area is the lower portion of each sample. All figures courtesy of the authors - 2. Loss of gloss measured at 20 degrees in accelerated exposure (top) and in natural exposure (bottom) - 3. Color change after exposure in accelerated weathering - 4. Color change after exposure in natural weathering - 5. Thickness reduction calculated from weight loss of free films in accelerated weathering (top) and in natural exposure (bottom) - 6. EIS results from accelerated weathering of all three samples of each coating. Symbols and colors show impedance data from the same coating formulation. Impedance of the unexposed samples is shown by the open symbols (higher values on each graph). Impedance values after six months are shown by filled symbols - 7. EIS results on panels weathered in Florida and Texas for six months En ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6016 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28372 [article]

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Corrosion domesticated and in the wild / Carl Reed in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 2 (02/2017)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 2 (02/2017) . - p. 46-53 Titre : Corrosion domesticated and in the wild Type de document : texte imprimé Auteurs : Carl Reed, Auteur ; Kat Coronado, Auteur Année de publication : 2017 Article en page(s) : p. 46-53 Note générale : Bibliogr. 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. Corrosion Essais accélérés (technologie) Etudes comparatives Revêtements -- Détérioration:Peinture -- Détérioration Revêtements organiques Index. décimale : 620.11 Matériaux (propriétés, résistance) Résumé : This article examines the four predominant sources of corrosion that occur “in the wild” and compares them to observational results found in exposure to accelerated corrosion conditions. By combining these observational attributes to mechanistic attributes previously examined, the use of accelerated corrosion testing can be better used as an indicator of how a coating will perform in various environmental conditions. Note de contenu : - MECHANISMS OF CORROSION ON STEEL COATED WITH ORGANIC COATINGS : Anodic : Fe -> Fe++ + 2e (oxidation), Cathodic : 2H2O+O + 4e -> 4OH (reduction) - Fe + 2H+ -> Fe++ + H2 - CORROSION CAUSATION AND EFFECTS : Erosion-induced corrosion - Damage-induced corrosion - Conductive-pathway-induced corrosion - Contamination-induced corrosion - FIGURES : 1. Mechanism of corrosion in a neutral or alkaline environment. All figures courtesy of the author unless otherwise specified - 2. Mechanism of corrosion in an acidic environment - 3. Mechanism of erosion-induced corrosion - 4a. In the wild — erosion-induced corrosion of an epoxy coating on a steel tank - 4b. In the wild — erosion-induced corrosion showing a banding effect of varying dry-film thicknesses of a protective coating - 5a. Domesticated — erosion-induced corrosion in a neutral environment - 5b. Domesticated — erosion-induced corrosion in an acidic environment - 6. Damage-induced corrosion - 7a. Domesticated — damage-induced corrosion in a neutral environment - 7b. Domesticated — damage-induced corrosion in an acidic environment - 8a. In the wild — damage-induced corrosion in a neutral environment - 8b. In the wild — damage-induced corrosion in an acidic environment - 9. Mechanism of corrosion on coated steel from conductive pathways - 10a. An example of domesticated conductive-pathway-induced corrosion - 10b. In the wild — an example of conductive-pathway-induced corrosion - 11. Mechanism of conductive-pathway formation on edges - 12a. Domesticated — corrosion on edges - 12b. In the wild — corrosion on edges - 13. Mechanism of contamination-induced corrosion - 14a. Domesticated — contamination-induced corrosion - 14b. In the wild — contamination-induced corrosion En ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6012 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28373 [article]

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Journal of Protective Coatings & Linings - Vol. 34, N° 2 URL