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Saponification : from paint to the grave / E. Bud Senkowski in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 31, N° 5 (05/2014)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 31, N° 5 (05/2014) . - p. 15-20 Titre : Saponification : from paint to the grave Type de document : texte imprimé Auteurs : E. Bud Senkowski, Auteur ; Richard A. Burgess, Auteur Année de publication : 2014 Article en page(s) : p. 15-20 Langues : Américain (ame) Catégories : Maçonnerie Métaux -- Surfaces Revêtements -- Détérioration:Peinture -- Détérioration Saponification La saponification est, dans le cadre général, une réaction chimique transformant un ester en un ion carboxylate et un alcool. Il s'agit en fait de l'hydrolyse en milieu basique d'un ester. Cette réaction permet la synthèse du savon.Initialement cette réaction est connue pour transformer le mélange d'un ester de glycérol et d'une base forte en un mélange de savon (ou acide gras) et glycérol, d'où son nom. Elle a été expliquée en 1823 par le chimiste français Michel-Eugène Chevreul qui a démontré que les corps gras sont formés d’une combinaison entre le glycérol et des acides gras. La saponification est une réaction lente mais totale. C'est une réaction exothermique. Il existe plusieurs procédés de saponification : 1. Le procédé discontinu ou marseillais est ancien mais toujours utilisé 2. Les procédés continus. Pour accélérer la réaction, on peut jouer sur plusieurs facteurs : maintenir une température élevée ; agiter le mélange soude - ester pour permettre aux réactifs de se rencontrer plus facilement et maintenir une émulsion. Index. décimale : 667.9 Revêtements et enduits Résumé : At its very basic level, saponification is the term given to the process in which vegetable oils and animal fats are converted into soap. We recognize soaps as wax-like products, modified through the addition of fragrances and skin-care additives (emollients) to become consumer cleaning and bathing products. The essential step in the soap-making process is the incorporation of an alkaline substance, like lye (sodium hydroxide, NaOH). The lye provides a source of hydroxyl ions (OH-) that digest and break down the structure of the oil or fat and produce various triglycerides. An example is shown in Figure 1. This article explores the many facets of saponification, including the chemical and environmental conditions that must be present for saponification to occur, and how d contributes to paint adhesion failures. A real life example of a saponification failure is discussed in-depth to aid in understanding the process. Note de contenu : - FROM PAINT : THE DESTRUCTIVE NATURE OF SAPONIFICATION - SAPONIFICATION OF PAINTED MASONRY SURFACES - SAPONIFICATION OF PAINTED METALLIC SURFACES - A REAL WORLD EXAMPLE OF SAPONIFICATION : Investigating the failure - Field investigation results - Laboratory investigation results - RECOMMENDATIONS - CONCLUSIONS - TO GRAVE-A BIZARRE EXAMPLE OF SAPONIFICATION Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21640 [article]

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Safety considerations for abrasive blasting operations in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 31, N° 5 (05/2014)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 31, N° 5 (05/2014) . - p. 23-27 Titre : Safety considerations for abrasive blasting operations Type de document : texte imprimé Année de publication : 2014 Article en page(s) : p. 23-27 Langues : Américain (ame) Catégories : Equipement de protection individuelle Règlements (droit administratif) Revêtements -- Décapage:Peinture -- Décapage Sécurité du travail Traitement de surface par impact Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : The Occupational Safety and Health Administration (OSHA) writes and enforces regulations that govern safety and health practices in the work place, with many pertaining to cleaning and painting operations. Most of these regulations are very specific about how to do a job safely. Their purpose is flot to make our job more difficult, but to make .it safer. These regulations have been developed over many years through studies on how and why accidents happen, and following these written procedures and regulations should ensure that we don't make the same mistakes that have injured others in the past. This article will review some of the general requirements of regulations on abrasive blasting and explain how they can help increase job safety. Note de contenu : HAZARDS OF ABRASIVE BLASTING : Dust - Noise - Equipment Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21641 [article]

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Bridge coating performance / Shameem A. Khan in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 31, N° 5 (05/2014)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 31, N° 5 (05/2014) . - p. 31-40 Titre : Bridge coating performance : Two-coat vs. three-coat systems Type de document : texte imprimé Auteurs : Shameem A. Khan, Auteur Année de publication : 2014 Article en page(s) : p. 31-40 Langues : Américain (ame) Catégories : Adhésion Chlorures Epaisseur -- Mesure Evaluation visuelle pH -- Mesure Ponts métalliques -- Revêtements protecteurs Qualité -- Contrôle Revêtements -- Décapage:Peinture -- Décapage Index. décimale : 667.9 Revêtements et enduits Résumé : In 2006, the Federal Highway Administration, through the Innovative Bridge Research and Construction Program (IBRC), initiated an examination of the performance and cost savings of several coating systems in an effort to provide information about innovative materials and technologies to state, county, and local bridge owners. Note de contenu : - BRIDGE SELECTION - COATING SYSTEMS - ABRASIVE BLAST CLEANING - TESTING AND RESULTS : Chloride testing - pH testing - Surface profile - Adhesion testing - Dry film thickness testing - VISUAL INSPECTION Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21642 [article]

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Maximizing water tank service life using a design-build approach / Dan Zienty in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 31, N° 5 (05/2014)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 31, N° 5 (05/2014) . - p. 42-50 Titre : Maximizing water tank service life using a design-build approach Type de document : texte imprimé Auteurs : Dan Zienty, Auteur Année de publication : 2014 Article en page(s) : p. 42-50 Langues : Américain (ame) Catégories : Applications extérieures Châteaux d'eau Conception technique Entretien et réparations Evaluation visuelle Qualité -- Contrôle Réservoirs (récipients) -- Conception et construction Réservoirs (récipients) -- revêtements protecteurs Revêtements intérieurs:Peinture intérieure Index. décimale : 667.9 Revêtements et enduits Résumé : They say there is more than one way to skin a cat. That same analogy holds true when considering the maintenance of a water tower. There are numerous approaches including direct selection, traditional design-bid-build, and design-build. Each approach holds merit, and before making the selection, an owner should carefully weigh the advantages and disadvantages of each. Some of these advantages and disadvantages are discussed in a previous article, "Old Tanks, Small Towns, Tight Budgets" (JPCL, May 2005). The sole purpose of selecting from any of the above approaches is simple: to maximize the service life of the water tower's applied coating system. Selecting an approach may be easier when the scope of work is based on the complete reconditioning or restoration of the facility. The contractor begins with a clean slate, and it is easy to identify where the responsibility lies should there be a premature failure. However, often times this approach is just not possible, and what may be referred to as aggressive maintenance is warranted at the system's approximate half-life. In 2006, SEH embarked on the design-build method of delivery for water storage tanks, and partnered with a Midwestern contractor. One of the first projects in the program was a 300,000-gallon water spheroid in the City of Eagle River, Wisconsin (referred to from this point forward as "the City.") The tank was last painted in 1991, making the existing coating system 15 years old. The first step prior to developing the project proposal, was conducting a com-prehensive inspection of tank surfaces in accordance with AWWA D101, including interior immersion, interior dry (access tube, riser, and base), and accessible exterior areas. Tank appurtenances were also evaluated for compliance with current AWWA and OSHA requirements. This article will review the design-build approach to developing and executing a maintenance plan to maximize the tank's coating system service life even beyond the recommended 15 to 20 years. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21643 [article]

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Coating maintenance planning to ensure reliable water and power delivery / Bobbi Jo E. Merten in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 31, N° 5 (05/2014)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 31, N° 5 (05/2014) . - p. 52-61 Titre : Coating maintenance planning to ensure reliable water and power delivery Type de document : texte imprimé Auteurs : Bobbi Jo E. Merten, Auteur ; Richard Pepin, Auteur ; David Tordonato, Auteur ; allen Skaja, Auteur Année de publication : 2014 Article en page(s) : p. 52-61 Langues : Américain (ame) Catégories : Entretien et réparations Planification stratégique Tuyauterie Tuyaux d'eau Index. décimale : 667.9 Revêtements et enduits Résumé : The Bureau of Reclamation is responsible for delivering raw water and power in the country's 17 western states. Reclamation infrastructure provides irrigation water to 25% and 60% of the nation's fruit and vegetable rrops, respectively. This water also reaches 31 million people for municipal, residential, and industrial uses. In addition, Reclamation contributes to 17% of nation's hydropower through 53 owned and operated hydroelectric power plants, including the Grand Coulee Dam in Washington, the Hoover Dam in Nevada, and the Buffalo Bill Dam in Wyoming. It is vital to ensure that this water and power delivery is continued and reliable. The successful operation of this very large and complex infrastructure requires careful coating maintenance planning. Reclamation's assets include small to extremely large facilities ; hard-to-access areas such as confined spaces, remote locations, and rough and steep terrain ; and atmospheric, immersion, or fluctuating immersion exposure conditions. Each scenario affects the maintenance plan, and creative solutions are often required to arrive at a cost-effective approach. This article describes the strategies used by Reclamation's facility personnel and coatings specialists to inspect, repair, and recoat coated infrastructure. The authors conclude with basic details one should consider when developing a coatings maintenance strategy. Note de contenu : - HYDROPOWER FACILITIES - COATINGS INSPECTION - MAINTENANCE OPTIONS : Deferral of maintenance - Spot repairs - Spot repairs with full overcoat(s) - Total removal and replacement - THE IDEAL MAINTENANCE - COATINGS MAINTENANCE PROJECT PROGRESSION : Scope definition - Coatings specification - Construction support - RECLAMATION'S COATINGS MAINTENANCE CHALLENGES - DEVELOPING A COATINGS MAINTENANCE STRATEGY Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21644 [article]

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Journal of Protective Coatings Technology - Vol. 31, N° 5 URL