Airport jet fuel piping lining issues / Rick A. Huntley in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 2 (02/2018)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 35, N° 2 (02/2018) . - p. 12-16 Titre : Airport jet fuel piping lining issues Type de document : texte imprimé Auteurs : Rick A. Huntley, Auteur ; Cynthia O'Malley, Auteur Année de publication : 2018 Article en page(s) : p. 12-16 Langues : Américain (ame) Catégories : Amines Une amine est un composé organique dérivé de l'ammoniac dont certains hydrogènes ont été remplacés par un groupement carboné. Si l'un des carbones liés à l'atome d'azote fait partie d'un groupement carbonyle, la molécule appartient à la famille des amides. Découvertes en 1849, par Wurtz les amines furent initialement appelées alcaloïdes artificiels. On parle d'amine primaire, secondaire ou tertiaire selon que l'on a un, deux ou trois hydrogènes substitués. Par exemple, la triméthylamine est une amine tertiaire, de formule N(CH3)3. Typiquement, les amines sont obtenues par alkylation d'amines de rang inférieur. En alkylant l'ammoniac, on obtient des amines primaires, qui peuvent être alkylées en amines secondaires puis amines tertiaires. L'alkylation de ces dernières permet d'obtenir des sels d'ammonium quaternaire. D'autre méthodes existent : 1. Les amines primaires peuvent être obtenues par réduction d'un groupement azoture, 2. Les amines peuvent aussi être obtenues par la réduction d'un amide, à l'aide d'un hydrure, 3. L'amination réductrice permet l'obtention d'amines substituées à partir de composés carbonylés (aldéhydes ou cétones), 4. Les amines primaires peuvent être obtenues par la réaction de Gabriel. Analyse des défaillances (fiabilité) Délaminage Epoxydes Expertises Phénoplastes Primaire (revêtement) Revêtements -- Défauts:Peinture -- Défauts Revêtements -- Détérioration:Peinture -- Détérioration Tuyauterie Index. décimale : 667.9 Revêtements et enduits Résumé : An international airport was in the midst of an expansion project. As part of the project, 24-inch-diameter jet fuel piping was being installed by a subcontractor hired by the general contractor that was directly hired by the owner to manage the project. The piping manufacturer installed both the interior and exterior linings. According to the specification, the interior of the pipes was required to be abrasive blast-cleaned to an SSPC-SP 10/NACE No. 2 Near-White Blast Cleaning finish. Additionally, according to the specification, “The standard required at the time of lining shall be a minimum of ISO 8501-1 grade Sa 2 1/2, with a surface profile of 70 ± 20 microns peak-to-trough height. The coating system specified for application to the interior of the piping system was a phenolic lining. According to the product data sheet, the lining material was an amine-cured, modified epoxy-phenolic. The primer’s solids content was approximately 65 percent by volume and the finish coat’s solids content was approximately 63 percent. Both coats had a recommended dry film thickness of 100-to-150 microns per coat. The specification required that the coating be applied in two coats at a dry film thickness of 125 microns per coat. The first 50 mm of the ends of the pipes were required to be left bare. The pipes were manufactured by a different company than the contracted company that was responsible for abrasive blast-cleaning and coating. After application of the interior coating, the pipes were transferred to a protected curing area. The interior of the curing area was heated with portable heaters. The pipes were delivered to the jobsite at the airport in three lots, referred to as Lot 1, Lot 2 and Lot 3. During installation of the pipes, no additional preparation or coating was required to be performed at the welded seams. Sometime after the pipes were shipped to the jobsite, a number of the pipes in Lot 2 had been placed in trenches and were exposed to flooding conditions that partially or fully exposed the pipes to muddy water. Most of the pipes that were exposed to the floodwater were subsequently cleaned with fresh water to remove sand and other contaminants. After the pipes had been exposed to the water, a video survey was performed to determine the condition of the interior coatings and to determine whether contaminants had been removed. It was discovered that the coating had blistered and delaminated in several areas. The delamination was most prevalent at the first several centimeters of the coating at the edges of the pipes. Note de contenu : - Table : Pieces of pipe examined during field visit - Fig. 1. Rust staining on the surface of the lining - Fig. 2. An exudate is visible on the surface of the primer - Fig. 3. Cracking pattern on primer consisting of traces of the gray topcoat - Fig. 4. Good adhesion of the coating on Lot 1 pipe - Fig. 5. Cracking pattern on topcoat and primer - Fig. 6. Rust staining could be scraped away with a knife En ligne : http://www.paintsquare.com/archive/index.cfm?fuseaction=view&articleid=6244 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30372 [article]

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Considerations for reconstruction of a bridge exhibiting staining / Cynthia O'Malley in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 4 (04/2018)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 35, N° 4 (04/2018) . - p. 13-17 Titre : Considerations for reconstruction of a bridge exhibiting staining Type de document : texte imprimé Auteurs : Cynthia O'Malley, Auteur Année de publication : 2018 Article en page(s) : p. 13-17 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. Anticorrosifs Anticorrosion Copolymère silicone acrylique Epoxydes Expertises Métaux -- Revêtements protecteurs Ponts -- entretien et réparations Ponts métalliques -- Revêtements protecteurs Revêtements -- Défauts:Peinture -- Défauts Revêtements multicouches Index. décimale : 667.9 Revêtements et enduits Résumé : When a large-scale bridge is in need of significant reconstruction, many factors should be considered prior to initiation of the project. Part of this particular reconstruction involved repainting of the structural steel on a 40-foot-wide lift bridge that had a total length (including approaches) of 2,877 feet, with a main span of 418 feet. The coating system selected consisted of four coats: a zinc primer coat, a tie-coat, one coat of epoxy and an acrylic polysiloxane topcoat with high gloss. The coating system was applied during the winter, spring and summer of 2008. Sometime after the topcoat was applied to the bridge, staining was noticed in numerous areas. These stains appeared as spots and streaks and were observed on various locations of the bridge, but the most concentrated areas were on the north side. The owner, through a recommendation of the prime engineer, contracted an independent, third-party consultant to investigate the staining problem and determine the cause in order to prepare for further rehabilitation. Note de contenu : - Field investigation- - Laboratory analysis and discussion - Fig. 1 : Close-up of stain around particle embedded in the topcoat - Fig. 2 : Streaks of staining on one of the bridge lift towers - Fig. 3 : Staining on north box chord - Fig. 4 : Severe staining on north fascia - Fig. 5 : Close-up of stain streak in sample area - Fig. 6 : Close-up of stain underneath rivet En ligne : https://www.paintsquare.com/archive/?fuseaction=view&articleid=6288 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30684 [article]

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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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