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Aerial robotic systems / Jamie Branch in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 7 (07/2018)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 35, N° 7 (07/2018) . - p. 28-33 Titre : Aerial robotic systems : A novel approach to safe coating inspection at heights Type de document : texte imprimé Auteurs : Jamie Branch, Auteur Année de publication : 2018 Article en page(s) : p. 28-33 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Contrôle technique Drones Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Traditional coating inspection techniques require extensive manual testing by the inspector, often at vertical heights that must be accessed by equipment such as scaffolding, lifts and ladders. Aerial robotic technology offers a novel approach to obtaining big data more efficiently, while reducing an inspector's occupational exposure to dangerous heights. This article addresses the benefits, as well as limitations, of utilizing aerial robotic systems as a viable means of coating inspection. Dry film thickness (DFT) is an integral component in determining the quality of a coating job. Strcutures with large surface areas will require enormous quantities of data to ensure that a coating is in compliance with the applicable standards and specifications. For example, if 300,000 m² of flat surface called for coating inspection by DFT, a minimum of 45,000 gauge readings would be required for compliance with SSPC-PA 2. To obtain these measurements, the inspector must manually touch the probe to the material being measured. Current handheld electronic Type 2 DFT equipment is conveniently designed to be lightweight and portable; however, it requires the inspector to physically access the testing sites, which are frequently located at dangerous heights. Scaffolding, scissor lifts, fall protection and other access equipment are utilized to reach test sites, which are expensive and present fall hazards to personnel accessing them. The Bureau of Labors Statistics reports that 849 workers lost their lives in 2016 from falling while on the job across all industries. The United States Occupational Safety and Health Administration (OSHA) established a hierarchy of hazard protection that specifies that engineering fall hazards out and away from the workplace is the most effective strategy for keeping workers safe. An alternative to performing measurements manually at the test site is to utilize an aerial robotic system to perform the measurements with the worker safely on the ground. This method satisfies OSHA's hierarchy of fall protection by engineering the fall hazard away by removing the necessity of the worker to access heights. Note de contenu : - BENEFITS : Safety - Time and cost savings - Big data tied to geospatial coordinates - LIMITATIONS : New technology - Wind - Confined spaces - Geometry - Fig. 1 : Robotic aircraft takes DFT readings on a ship - Fig. 2 : A pilot navigates the aircraft while remaining safly on the ground - Fig. 3 : An aircraft inspects at a chemical plant - Fig. 4 : Robotic aircraft are a cost-effective tool, reducing billable time spent repetitively accessing inspection areas - Fig. 5 : Inspection of multiple structure types can be safely conducted by robotic aircraft Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31611 [article]

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Qualification tests for high-temperature FBE coatings / Hassan Al-Sagour in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 7 (07/2018)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 35, N° 7 (07/2018) . - p. 34-43 Titre : Qualification tests for high-temperature FBE coatings Type de document : texte imprimé Auteurs : Hassan Al-Sagour, Auteur ; Mana Al-Mansour, Auteur Année de publication : 2018 Article en page(s) : p. 34-43 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique Décollement cathodique (revêtement) Essais de résilience Evaluation visuelle Fonctionnelles densité La théorie de la fonctionnelle de la densité (pour Density Functional Theory, sous-entendu électronique : DFT) constitue au début du XXIe siècle l'une des méthodes les plus utilisées dans les calculs quantiques de la structure électronique de la matière (atomes, molécules, solides) aussi bien en physique de la matière condensée qu'en chimie quantique. La DFT trouve ses origines dans le modèle développé par Llewellyn Thomas et Enrico Fermi à la fin des années 1920. Hautes températures Résistance chimique Revêtement époxy lié par fusion Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Index. décimale : 667.9 Revêtements et enduits Résumé : This experiment helps to confirm some already well-established theories, in addition to a few new findings. * There are existing FBE formulations that can handle immersion in chemically agressive solutions at high temperatures. * Only one product of the three tested qualified for use at high temperatures (140 C). More FBE products that can handle such higher temperatures are needed. * Notably, there is a compromise in flexibility for high-temperature FBE coatings. * Highly alkaline media is the most agressive to FBE coatings at high temperatures. * Discoloration may be a sign of failure, especially when associated with changes in other properties, such as thickness (increased swelling), loss of adhesion and degrading barrier property (low impedance). * In immersion, wet glass transition temperature may be a much lower than the dry Tg. In more agressive conditions, the gap between dry and wet Tg may be even wider. * The type of application used for coating samples may be detrimental to tests. This claim must be investigated further. * Because coating shops use spray application, testing samples should be sprayed or taken from actual shop application. Note de contenu : - EXPERIMENTAL DESIGN AND TEST METHODOLOGY : Attenuated total reflectance -Fourier transform infrared spectroscopy - Thermal analysis - Differential scanning calorimetry (DSC) - Flexibility (Bending test) - Impact resistance - Cathodic disbondment - Chemical resistance - DFT measurements - Pull-off adhesion - EIS - DISCUSSION : Coating A - Coating A' - Coating B - Coating C - Table 1 : Thermal characteristics of the four coatings - Table 2 : Flexibility readings (in °/pd) - Table 3 : Impact resistance measurements - Table 4 : Average disbondment - Table 5 : Visual examination post-immersion - Table 6 : DFT measurements post-immersion in NaOH solution - Table 7 : Pull-off adhesion before and after chemical resistance test (psi) - Table 8 : Electrochemical impedance spectroscopy (EIS) - Fig. 1 : Sampld DSC graphs for coating A Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31876 [article]

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The effect of surface preparation grades of weld seams on coating performance / Sang-Moon Shin in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 7 (07/2018)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 35, N° 7 (07/2018) . - p. 44-48 Titre : The effect of surface preparation grades of weld seams on coating performance Type de document : texte imprimé Auteurs : Sang-Moon Shin, Auteur ; Chung-Seo Park, Auteur ; Seung-Gon Choo, Auteur ; Eun-Ha Song, Auteur ; Han-Jin Bae, Auteur Année de publication : 2018 Article en page(s) : p. 44-48 Langues : Américain (ame) Catégories : Anticorrosion Epaisseur -- Mesure Epoxydes Essais de brouillard salin Evaluation visuelle Lignes de soudure Métaux -- Revêtements protecteurs Métaux -- Revêtements:Métaux -- Peinture Métaux -- Surfaces Résistance à la fissuration Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : According to the international surface preparation standard for welds (ISO 8501-3, "Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 3 : Preparation grades of welds, edges and other areas with surface imperfections"), the preparation grades before paint application are divided into three levels: P1, P2 and P3 (Fig.a). These grades are described with rough qualitative representations instead of with descriptions of surface treatment methods or mesurable conditions. Because of the ambiguous wording in the standard, there have been a lot of argument about surface preparation grades and abraded condition during construction. In this study, coating thickness, the corrosion resistance and crack tendency of the coated films on the welds were evaluated for the grinding range in five levels from mild to servere. Each ground specimen was blasted to Sa 2.5 and coated with two coats of epoxy paints. The performance of coating on welds with the grades of grinding condition were not significantly different, satisfying the criteria of ISO 12944-5, "Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 5 : Protective paint systems" (C5-M medium). After blasting, all ground specimens showed smooth surfaces that did not result in a sharp edge or excessive film thickness. Note de contenu : - Visual inspection of surface treatment on the welding line - Measurement of coating film thickness on the welding line - Corrosion resistance - Crack resistance - Fig. 1 : Cross section of a typical weld bead - Fig. 2 : Configuration of the test specimens: T-bar (top) and weld (bottom) - Fig. 3 : Crack resistance test results (the number of cycles of crack initiation) - Table 1 : Appearance of specimens with five grades of surface preparation - Table 2 : Test coating system - Table 3 : Results of coating film-thickness measurements in µm - Table 4 : Rust creepage from the scribe line after salt-spray exposure for 1,440 Hours Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31888 [article]

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Journal of protective coatings and linings Vol. 35, N° 7 URL