PT
Liquid Penetrant Testing
Summary
Detects surface-breaking discontinuities by applying a liquid penetrant that seeps into surface openings. Works on any non-porous material.
Scope
Surface examination for discontinuities open to the surface.
Key Requirements
Governing Standards
- ASME Section V, Article 6
- AWS D1.1 Clause 6, Part D
- ISO 3452-1
- ISO 23277
What It Detects
- Surface-breaking cracks
- Porosity (open to surface)
- Laps and seams
- Through-wall leaks
Limitations
- Surface-breaking defects only
- Requires clean, non-porous surface
- Temperature-sensitive (typically 10-52 deg C)
Required Certifications
- ASNT Level II PT
- ISO 9712 Level 2 PT
- PCN Level 2 PT
Applicable Materials
Stainless Steel 304Stainless Steel 316AluminumDuplex Stainless SteelNickel AlloysCarbon SteelLow Alloy Steel
Applicable Processes
SMAWGMAWGTAWFCAWSAW