The ASTM G62-23 standard introduces two methods for detecting pinholing in pipeline coatings. Method A uses low voltage and plain water for testing. It is suitable for detecting pinholing and voids in thin film coatings, but thin spots in coatings cannot be found. Method B uses high voltage. It can detect pinholing, voids and thin spots in coatings. However, this method is considered Destructiveness test because high voltage may cause coating damage. The standard specifies specific implementation steps for both methods, aiming to ensure coating mass and verify its Reliability in practical application.