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The case of the spotty disbondment in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 8 (08/2017)
[article]
Titre : The case of the spotty disbondment Type de document : texte imprimé Année de publication : 2017 Article en page(s) : p. 14-19 Langues : Américain (ame) Catégories : Analyse des défaillances (fiabilité)
Décollement cathodique (revêtement)
Epoxydes
Expertises
Haut extrait sec
Métaux -- Revêtements protecteurs
Réservoirs (récipients)
Réservoirs (récipients) -- revêtements protecteurs
Revêtements -- Défauts:Peinture -- DéfautsIndex. décimale : 667.9 Revêtements et enduits Résumé : The author examined a tank of the floating-roof some 100 feet in diameter and hidden a mile off a two-lane blacktop. It was a vivid white storage tank and showed bright in stark and gleaming contrast to the head-high, green corn and golden silk of the ears.
The facility was spotless and cleaned and the tank was vented.
The tank interior was pristine but for the various areas of peeling and otherwise distressed paint.
The tank was designed to store wastewater mixed with petroleum byproducts. The exact contents were not revealed but it was a unique blend and no one knew quite how the material would interact with the coating system.
It was reported that the epoxy coating system had been installed six years earlier and purported to be high-solids (greater than 98 percent) applied at approximately 20 mils. There were discrepancies as to whether a primer was used during the initial install and whether or not repairs had taken place during the application. One account indicated that during the initial application some large areas on the floor were too thin and the material was re-sprayed.Note de contenu : - Signs of trouble
- The visual inspection
- Getting up close and personal
- Surface prep
- Solving in the mystery
- Do you know ?
- The awner(s)
- Problem number one, two and three
- Recommendations
Fig. 1. The epoxy is clearly peeling away from the substrate. All figures courtesy of the author unless otherwise noted
Fig. 2. The scalloped area highlighted by the blue area shows evidence of good adhesion
Fig. 3. In some areas of the tank floor, the chips of coating coming off were dirty on the bottom side
Fig. 4. In some areas of the tank floor, the chips of coating coming off were clean on the bottom side
Fig. 5. Stills from a video that show areas of disbondment and poor adhesion found sporadically throughout the tank
Fig. 6. The football-shaped, damaged sections exhibiting a cohesive failure were only found in areas such as lap welds, the sump lip and slightly raised sections of the tank floor
Fig. 7. Stills from a second video show the disbonded coating coming off where the back side of the coating appears to be contaminated with dirt, or more likely, with dust from blasting
Fig. 8. The steel substrate in the failing areas examined had a peened, crater-like profile (left) and not an angular one as was required (right)En ligne : http://www.paintsquare.com/archive/index.cfm?fuseaction=view&articleid=6105 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29162
in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 8 (08/2017) . - p. 14-19[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19078 - Périodique Bibliothèque principale Documentaires Disponible The case of... the strange blistering in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 27, N° 5 (05/2010)
[article]
Titre : The case of... the strange blistering Type de document : texte imprimé Année de publication : 2010 Langues : Américain (ame) Catégories : Revêtements -- Défauts Tags : Revêtements 'Formation de bulles' Index. décimale : 667.9 Revêtements et enduits Résumé : An owner intentionally selected a coating system that used the prevailing cool, humid environment inside the salt water ballast tanks to help cure the coating system during dry docking and coating repair operations. Despite this foresight, the repair coating blistered within a year. Was the contractor apply the coating over contaminated surfaces ? Or was the wrong coating selected for the service environment ? Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9577
in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 27, N° 5 (05/2010)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012216 - Périodique Bibliothèque principale Documentaires Disponible The compromised propane tank coating / Jayson L. Helsel in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 30, N° 11 (11/2013)
[article]
Titre : The compromised propane tank coating Type de document : texte imprimé Auteurs : Jayson L. Helsel, Auteur ; Richard A. Burgess, Auteur Année de publication : 2013 Article en page(s) : p. 17-21 Langues : Américain (ame) Catégories : Adhésion
Délaminage
Dureté (matériaux)
Evaluation
Métaux -- Revêtements protecteurs
Réservoirs (récipients) -- revêtements protecteurs
Revêtements -- Défauts:Peinture -- DéfautsIndex. décimale : 667.9 Revêtements et enduits Résumé : The exterior coating system on six propane tanks was delaminating alter only one year of being stored under cover in Mexico. Could the system be repaired ? Or was it a total loss ?
A gas transmission company had all six of the propane tanks fabricated and coated in Mexico for a U.S. facility. The specified surface preparation was Near-White blast cleaning in accordance with SSPC-SP 10/NACE 2, followed by application of a 100%-solids polyurethane coating system. The coating thickness was specified to be a minimum of 20 mils. Although the coating could have been applied in one coat, preferably by plural-component spray, to meet the specification, the polyurethane could also have been applied in more than one layer if done within a limited recoat window. After completion, the tanks were reportedly stored under cover until shipment to the facility in the northeastern U.S. nearly a year later. After the tanks had arrived on site, problems with the coatings were observed when the tanks were installed on concrete footings. The coatings appeared to be delaminating between layers or between what appeared to be two coating layers and the steel substrate. High-voltage and low-voltage holiday testing performed by the facility owner revealed numerous holidays.
The investigator visited the site to examine the coatings and to determine what repairs were necessary. Additionally, the intended painting contractor for repair work was onsite to "sweep blast" test sections on the tank exterior to help determine the viability of this method as part of a repair procedure.Note de contenu : - THE SITE VISIT : Visual assessment - Coating thickness - Coating adhesion - Coating hardness - Test sections
- ANALYSIS OF PROBLEMSPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20722
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Code-barres Cote Support Localisation Section Disponibilité 15830 - Périodique Bibliothèque principale Documentaires Disponible The curse of the mummy / Mike O'Donoghue in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 2 (02/2016)
[article]
Titre : The curse of the mummy : Mysterious tank lining failures in wac vessels Type de document : texte imprimé Auteurs : Mike O'Donoghue, Auteur ; Vijay Datta, Auteur ; Sean Adlem, Auteur ; Jack Whittaker, Auteur ; Doug Wade, Auteur ; Margaret Pardy, Auteur Année de publication : 2016 Article en page(s) : p. 30-41 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse des défaillances (fiabilité)
Anticorrosion
Epoxydes
Réservoirs (récipients) -- revêtements protecteurs
Résistance chimique
Revêtements -- DéfautsIndex. décimale : 667.9 Revêtements et enduits Résumé : Epoxy lining failures in WAC vessels - This article outlines discoveries made from forensic work to unravel epoxy lining failures in several water treatment weak acid cation (WAC) vessels. In previous work by authors Mike O'Donoghue and Vijay Datte, a forensic investigation of several costly tank lining failures was presented as analogous to an archeological dig wherein anticipation and wonder mounted as the investigation unearthed and unwrapped a "chemical mummy.
Would the present study prove to be similar ? Or would a different type of mummy be discovered in another, and altogether différent, series of tank lining failures. The answer was soon to be discovered in the Canadien ail patch where attention was focused on boiter feed water.
In the treatment of steam assisted gravity drainage (SAGD) boiler feed water, WAC and strong acid cation (SAC) ion-exchange vessels play an important role in the treatment of process fluids and demineralization of water to generate steam. The service conditions in WAC vessels are more aggressive than those in SAC vessels, with typical SAGD operating temperatures in excess of 93 C (200 F), operating pressures of 40-to-60 psi and a weekly regeneration protocol that consists of approximately 1.5 hours of acid treatment (6-percent hydrochloric acid, HCI) followed by 1.5 hours of caustic treatment (5-percent sodium hydroxide, NaOH). The ion-exchange resin bels in the WAC vessels are not considered overly aggressive when compared to the aggressive regeneration conditions. WAC resins have a carboxylic acid (COOH) functional group and are produced by copolymerizing acrylic acid with divinyl-benzene as a crosslinking agent2.3.
Due to the severity of the conditions in WAC and SAC vessels, high-performance linings must be carefully selected and carefully applied. The expectations are that the linings in WAC vessels should afford corrosion protection for at least 10 years.Note de contenu : - WAC AND SAC FLOW PROCESS
- RUBBER LINING FAILURES AND LABORATORY TEST PROGRAM
- SOLVENT-FREE EPOXY (SFE 1) : BEST IN TEST
- APPLICATION OF SFE 1 IN WAC VESSELS : Surface preparation - Application - Dry-film thikcness (DFT)
- THE MYSTERIOUS LINING FAILURE OF SFE 1
- FAILURE ANALYSIS : Observationin the WAC vessels
- DETERMINATION OF BASE-TO-CONVERVER MIX RATIO OF SFE 1 : ATR-FTIR of SPE 1 coating chip and control
- DISCUSSION : Epoxy chemistry of SFE 1 - Application considerations and field observations
- FIGURES : 1. A WAC vessel in service in the Canadian oil patch - 2. Prequalification testing of SFE 1 - 3. Surface blisters on SFE 1 in prequalification testing - SFE 1 in WAC vessels after two years of service
- TABLES : 1. Prequalification immersion testing at 90C of solvent free epoxy, SFE 1 in 10% HCL 10% nadh and process fluids - 2. Prequalification adhesion testing of solvent free-epoxy, SFE 1 - 3. WAC vessel A - Application of SFE 1 - 4. WAC vessel a lined with SFE 1 after 2 years service
Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25632
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Code-barres Cote Support Localisation Section Disponibilité 17889 - Périodique Bibliothèque principale Documentaires Disponible The missing piece / Chrissy Stewart in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 12 (12/2017)
[article]
Titre : The missing piece : Collaborations between field investigators and laboratory chemists Type de document : texte imprimé Auteurs : Chrissy Stewart, Auteur Année de publication : 2018 Article en page(s) : p. 19-24 Langues : Américain (ame) Catégories : Analyse des défaillances (fiabilité)
Cloquage (défauts)
Délaminage
Expertises
Revêtements -- Défauts:Peinture -- DéfautsIndex. décimale : 667.9 Revêtements et enduits Résumé : Coating failure analysis draws many parallels to these shows. In fact, you can almost envision it: a camera pans over a work site, dramatic music plays as a water tank is being drained. The manway slowly swings open to reveal massive and extensive blistering of the newly applied interior coating system. The owner frantically calls to report the dire situation he has just discovered. Cut to opening credits.
The most dramatic moment of the show is usually when some small detail that had been previously overlooked is discovered. The breakthrough can come from the investigator, the laboratory, even someone with minimal involvement in the case — a taxi driver, or a neighbor with a different perspective of what all the information means.
This can often be said for coating failure investigations as well. The key to solving these cases is to combine all of the knowledge gained during the investigation and let the data tell the story.
The type of information that can be obtained from the field investigation is much different than the data produced by the lab. The field investigation gives the investigator the opportunity to make observations on and around the structure, observe for coating failure patterns, test adhesion to the substrate, inspect the surface profile, sift through paint cans, interview individuals on-site — simply, the field investigator takes a more hands-on approach. The laboratory investigation gives the added benefit of examining coating samples from the field using sophisticated analytical techniques to gain information that would not be readily obtained without the proper instrumentation.
Two different scenarios will be described, one a laboratory investigation without the benefit of direct field knowledge and one that combines both field and lab investigations.Note de contenu :
- SCENARIO #1 : Coating delamination in scrubber tower : Laboratory investigation
- FAILURE SCENARIO #2 : BLISTERING ON BRIDGE RAILINGS : Field and laboratory investigations
- FIGURES : 1. Glossy top surface of red primer - 2. Cross-section of gray topcoat separated from red primer - 3. Uneven appearance of red primer - 4. Blistered area prior to scraping - Fig. 5 : Blistered area after scraping to reveal a red layer beneath the gray - 6. Cross-section of blister capEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6215 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30359
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Code-barres Cote Support Localisation Section Disponibilité 19542 - Périodique Bibliothèque principale Documentaires Disponible The need for an independent third-party coatings inspector / Tim Bauman in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 2 (02/2018)
PermalinkThe "Whoas" of solvent entrapment and release / Richard A. Burgess in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 31, N° 3 (03/2014)
PermalinkThermal failure of thermal barrier coating with thermal sprayed bond coating on titanium alloy / Bo He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 1 (03/2008)
PermalinkWaterborne crackle decorative coatings and crack patterns / Mayur Khandait in PAINTINDIA, Vol. LXXI, N° 1 (01/2021)
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