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

What is the most commonly used method for removing non-water-washable visible dye penetrant from the surface of a test specimen?

1. Hand wiping

2. Water washing

3. Ultrasonic cleaning

4. Solvent soaking

The correct answer is: Hand wiping

The most widely accepted method for removing non-water-washable visible dye penetrant is through hand wiping. This technique involves using an absorbent cloth to manually wipe off excess penetrant from the surface of the test specimen. Hand wiping is particularly effective because it allows for controlled application of pressure and choice of the cleaning material, ensuring that the penetrant is adequately removed without damaging the substrate. Non-water-washable penetrants are specifically formulated to require organic solvents for removal, which aligns with the hand wiping method. This method does not require complex equipment or lengthy processes, making it practical for on-site testing. In contrast to other methods, hand wiping is efficient and enables personnel to visually inspect the penetration's uniformity during the cleaning process. It provides immediate feedback about the condition of the surface and ensures that any residual penetrant is minimized for accurate test results.