Liquid Penetrant Testing Level 1 (PT-1) Practice Exam

What is the common application of water washable penetrants?

1. Non-destructive testing

2. Leak testing

3. Pressure testing

4. Surface cleaning

The correct answer is: Non-destructive testing

Water washable penetrants are primarily used in non-destructive testing (NDT) due to their ability to detect surface-breaking flaws and irregularities in materials without causing any damage. These penetrants work by being applied to a surface, where they seep into any defects. After a specified dwell time, the excess penetrant is removed, usually with water, and a developer is applied to draw out any remaining penetrant from the defects, making them visible under ultraviolet or white light. The reason water washable penetrants are favored in non-destructive testing is their ease of use and cleanup, which allows for effective inspection processes without the need for harsh solvents or chemicals that may damage the test surface or environment. This quality makes them a preferred choice when conducting thorough assessments for integrity in structures and components.