| Titre : |
Unsuitable spray equipment = unacceptable results |
| Type de document : |
texte imprimé |
| Auteurs : |
Peter Bock, Auteur |
| Année de publication : |
2016 |
| Article en page(s) : |
p. 12-17 |
| Langues : |
Américain (ame) |
| Catégories : |
Dépôt par pulvérisation
Expertises
Structures offshore -- Revêtements protecteurs
Système de pulvérisation (technologie)
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Both problems involved different valves for use in the structure that were supplied by a single global valve manufacturer to be installed on the same offshore structure for the same owner with the same paint spec and supplier, but each resulted in an entirely different failure.
A large valve company that manufactures valves in locations around the world had been selected to supply all of the valves for a new offshore production platform. The valve company claimed that QA/QC procedures were identical at all of its shops worldwide and that valves could be supplied to fabricators from the nearest valve facility without any difference in the quality of the coating system.
Assuring that the same coating system and the same levels of quality for surface preparation and coating application are obtained for components manufactured in nearby or faraway places requires cooperation from the structure owner, their specifier, the selected coating supplier and the far-flung manufacturers of the components and units to be assembled into a single production structure.
Early on in the new construction of subassemblies of the offshore platform (nothing was in service yet), groups of valves left the valve manufacturer’s shops, supposedly after the valve manufacturer shop’s QA professional had inspected them and certified in writing that they met the owner’s spec.
When the shipments of valves arrived at the sub unit and the unit fabricator’s yard, the inspector there checked them before they were incorporated into use. |
| Note de contenu : |
- FIGURES : 1. Small valves with complex surfaces require conventional spray application for uniform dry film thickness and acceptable appearance - 2. Stippled, wavy appearance of the coating on a small valve indicates airless spray application and an attempt to control DFT by repeatedly triggering the airless gun - 3. Rough surface texture and a wide variation of dry film thickness readings on a small valve are the typical result of airless spray application - 4. Very smooth coating surface and relatively uniform dry film thicknesses are characteristic of conventional spray application |
| En ligne : |
http://www.paintsquare.com/archive/?fuseaction=view&articleid=5935 |
| Format de la ressource électronique : |
Web |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28389 |
in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 33, N° 10 (10/2016) . - p. 12-17
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Unsuitable spray equipment = unacceptable results in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 10 (10/2016)
