Significado e uso
5.1 Método A — Method A describes a rapid and safe method for determining whether there are pinholes, voids, or metal particles protruding from the coating. No entanto, this method does not detect any thin spots in the coating. This method will determine if there are any serious defects in the film pipe coating.

5.2 Método B — Method B describes a method for determining whether there are pinholes, voids, or metal particles protruding from the coating and thin spots in the pipe coating. The method can be used to verify minimum coating thickness as well as voids in quality control applications.

Método de teste padrão ASTM G62-2022 para detecção de pontos de vazamento de revestimentos de tubos

faixa
1.1 These test methods cover equipment and procedures for detecting leaks in pipe-type coatings.

1.2 Method A is designed to detect defects such as holes and voids in thin film coatings of a thickness of 0.025 para 0.254 milímetros (1 para 10 mil) using ordinary tap water and an applied voltage of less than 100 VCC. If the wetting agent is used with water, it is effective against films up to 0.508 milímetros (20 mil) thick. No entanto, it should be noted that this method does not detect thin spots in the coating. Due to the relatively low voltage, this can be considered non-destructive testing.

1.3 Method B is used to detect defects such as pinholes and voids in pipeline coatings; But because of the higher voltage applied, it can also be used to detect thin spots in coatings. The method can be used for pipe coatings of any thickness and uses 900 para 20 000 V DC voltage. 2 This method is considered destructive because the high pressure involved usually destroys the coating at thin points.

1.4 The value of the International System of Units with three significant decimals shall prevail. Os valores dados entre parênteses são apenas para referência.

1.5 Esta norma não se destina a abordar todos, caso existam, preocupações de segurança associadas ao seu uso. É responsabilidade dos usuários desta norma estabelecer medidas de segurança apropriadas, práticas de saúde e ambientais e para determinar a aplicabilidade de restrições regulatórias antes do uso.

1.6 Esta norma internacional é baseada em princípios de padronização reconhecidos internacionalmente, estabelecidos na Decisão sobre Normas Internacionais, Guidelines and Recommended Principles issued by the WTO Committee on Technical Barriers to Trade (TBT).