Post by Milan Jani

🧼 Types of Cleaning, Equipment & Materials Why "Clean" Is the Most Important Step in Liquid Penetrant Testing (PT) A successful Liquid Penetrant Test begins long before the penetrant is applied—it starts with proper surface preparation. If the specimen is not clean and completely dry, contaminants such as oil, grease, dirt, paint, rust, or scale can block surface-breaking discontinuities, preventing the penetrant from entering the defects. The result? Missed indications and unreliable inspection results. 🔹 Key Takeaways for Every PT Inspector: ✅ Vapor Degreasing – One of the most effective methods for removing oils and organic contaminants. ✅ Avoid Blast Cleaning – Sandblasting, shot blasting, or grit blasting can "peen" over defect openings, making cracks invisible to the penetrant. ✅ Choose the Right Cleaning Method – Solvent cleaning, alkaline cleaning, ultrasonic cleaning, and detergent washing should be selected based on the material and type of contamination. ✅ Safety Comes First – Always use UV-A lamps with the proper filters to protect your eyes, wear appropriate gloves when handling penetrants and developers, and ensure adequate ventilation when using cleaning solvents. 📌 Remember: The quality of a PT inspection is only as good as the quality of the surface preparation. Clean surface = Reliable results. What cleaning method do you prefer before performing PT inspections? Share your experience in the comments. #NDT #LiquidPenetrantTesting #DPT #SurfacePreparation #QualityControl #QualityAssurance #Inspection #Engineering #SafetyFirst #Maintenance #Manufacturing #AssetIntegrity