Guidance on Auditing Liquid Penetrant Testing

This document is a guidance for API Monogram/APIQR auditors conducting API audits related to Liquid Penetrant Testing (LPT). It does not prescribe any requirements for Licensed or Registered organizations, as actual requirements are specified in API product specifications and quality management system standards. Auditors are expected to ensure that facilities conform to applicable product specification requirements and quality management system requirements. The guidance outlines areas of emphasis for auditors, including the examination sequence, precleaning, application of penetrant, removal of penetrant, application of developer, inspection, post-cleaning, and record maintenance. It also details the specific requirements and processes associated with various methods of LPT, such as visible and fluorescent penetrant examinations. The document emphasizes the importance of familiarizing oneself with referenced standards and validating procedures to achieve intended results.