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A steel surface has been properly prepared to a white metal blast and it looks great … to the naked eye at least. But is it? Why is a surface that has the correct profile and appears to be perfectly clean typically not good enough? A standard abrasive blast will give you the profile and visible cleanliness, but how clean is it? Testing is the only way to determine. That is testing for conductivity, chlorides, and any other contaminants.
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This standard contains the general requirements for the safe and effective use of APC equipment, operated either manually hand-held or through use of automation, to prepare various metallic surfaces for maintenance, repair, recoating, or lining. This standard does not address surface preparation of concrete.
APC is applied to the entire surface specified to be prepared for a new coating or lining. Poorly adhered surface material and coating that cannot withstand the APC process are removed, while, depending on the chosen cleanliness level, any remaining coating is suitably prepared prior to the application of a new coating layer over the existing. In the case of metallic substrates, the underlying surface profile will be revealed whenever surface contamination and coatings are removed.
Requirements for qualification of an industrial coating and lining application specialist that includes surface preparation and coating application for steel and concrete surfaces of industrial structures.
Pond investigated pressure vessel tank failures which are causing recurring maintenance of $250,000 per year. This challenging project had limitations of space, operational time pressures/vessel availability requirements, cost and replacement variables. This presentation will chronical problems and discuss best practices of specifications, material selection, surface preparation, and application inspection that would have prevented the aforementioned outcome. This paper discusses the fundamentals of composite coatings, industry accepted design standards for their use, and examples of typical uses for these materials that solve problems in varied industries.
Coating standards specify the required surface conditions needed prior to coating. A maximum amount of soluble salts of 20 mg/m2 is widely adopted as acceptation criteria, according to standard NORSOK M-5011. However, meeting these requirements for thermal spray aluminium coatings (TSA) in offshore environments is challenging due to the ubiquitous nature of water-soluble salts.
Corrosion is a universal challenge for metal structures. Metal, due to its natural strength, is a common choice for building materials yet sensitive to the environment it is placed in, requiring mitigating actions to ensure proper lifecycle. Coatings are utilized as the primary defense against corrosion; the type based on substrate material and environment.
Esta norma conjunta abrange o uso de abrasivos para jateamento com o objetivo de atingir um grau definido de limpeza de superfícies de aço antes da aplicação de um revestimento protetor ou um sistema de revestimento. Esta norma destina-se ao uso por especificadores, aplicadores, inspetores de cobertura ou revestimento ou outros que venham a ser responsáveis por definir um grau padrão de limpeza de superfície.
O foco desta norma é o jateamento abrasivo brush-off. O jateamento abrasivo ao metal branco, o jateamento abrasivo ao metal quase branco, o jateamento abrasivo comercial e o jateamento abrasivo industrial são abordados em normas separadas.
Esta norma conjunta da SSPC/NACE define o processo de preparação de uma superfície de aço-carbono ao grau de metal quase-branco de limpeza superficial usando um método de jateamento abrasivo úmido (WAB) de limpeza. Esta norma destina-se ao uso por especificadores, aplicadores e inspetores de revestimentos ou outros cuja responsabilidade seja definir um grau padrão de limpeza superficial para superfícies de aço-carbono a ser alcançada por limpeza por jateamento abrasivo úmido.
A limpeza WAB é um processo que usa uma mistura de água e abrasivo que pode produzir diversos níveis de limpeza e perfil (aspereza) superficial similar aqueles obtidos por limpeza por jateamento abrasivo seco (DAB). A limpeza WAB pode ser especificada quando se deseja supressão de pó, e também pode ser um meio de reduzir a contaminação por sais solúveis. O nível de limpeza WAB especificado deve ser o mesmo que o grau de limpeza especificado correspondente para o processo de limpeza DAB.
Factors that make electrical substation painting unique. Worker safety and painting of radiators. Providing owners, engineers, and maintenance personnel with sample specifications that they may modify to meet their specific requirements. Historical Document 1995
HISTORICAL DOCUMENT. Procedures to design, apply, and inspect fiberglass-reinforced plastic (FRP) linings on the internal bottoms of aboveground storage tanks (ASTs) in the petroleum/petrochemical industry and in other service.