Nondestructive Testing
Nondestructive Testing, or NDT, examines materials, components, and structures for defects without damaging their intended usefulness.
What this term means in maintenance
Nondestructive Testing, or NDT, examines materials, components, and structures for defects without damaging their intended usefulness.
Common NDT methods
Methods include:
- Visual testing
- Ultrasonic testing
- Radiographic testing
- Magnetic particle testing
- Liquid penetrant testing
- Eddy current testing
Practical example
A pressure-vessel weld is inspected for surface and internal defects without cutting or destroying the vessel.
Method selection
The method depends on material, defect type, geometry, access, thickness, safety, and required sensitivity.
Records
NDT records should include method, procedure, equipment, technician qualification, location, result, acceptance criteria, and report.
Common mistake
Using one NDT method for every defect type can miss flaws the method cannot reliably detect.
How this term differs
Nondestructive Testing is the overall family of inspection methods that do not destroy the component. It is related to Eddy Current Testing, Liquid Penetrant Testing, and Magnetic Particle Testing, but these terms describe different records, measures, roles, strategies, or decisions and should not be used interchangeably.
Related concepts
Related maintenance terms
Keep exploring connected CMMS, reliability, and maintenance planning terms.
Ultrasonic Testing
Ultrasonic testing uses high-frequency sound waves to detect internal flaws or measure material thickness.
Radiographic Testing
Radiographic testing uses X-rays or gamma radiation to produce an image of internal material and weld conditions.
Liquid Penetrant Testing
Liquid penetrant testing detects surface-breaking defects in nonporous materials using a visible or fluorescent penetrant.
Glossary FAQs
- What does NDT stand for?
NDT stands for Nondestructive Testing.
- What are common NDT methods?
Visual, ultrasonic, radiographic, magnetic particle, liquid penetrant, and eddy current testing.
- Why use NDT?
It identifies defects without destroying the component's intended usefulness.