What is typically required before applying penetrant in a PT procedure?

Before applying penetrant in a liquid penetrant testing (PT) procedure, surface preparation to ensure cleanliness is typically required. This step is crucial because contaminants such as grease, oil, dirt, or any other surface debris can hinder the penetrant's ability to enter cracks or flaws within the material being inspected. A clean surface allows for effective adhesion of the penetrant, enhancing the detection of discontinuities during the testing process.

Additionally, ensuring the surface is clean helps to achieve consistent and repeatable results, which are essential in non-destructive testing. Proper surface preparation directly contributes to the accuracy and reliability of the inspection outcome, making it a fundamental requirement in PT procedures.

While other options such as the use of high-pressure water for cleaning, application of a primer coat, or environmental protection measures can be relevant in certain contexts, they are not universally required as part of the standard surface preparation prior to penetrant application.