NDE Methods
NDE can be defined as an inspection method that does not adversely affect the item being inspected. NDE is usually specified to:
Ensure quality during manufacture by identifying imperfections and defects
In-service inspection with the objective of detecting defects due to physical deterioration of a component, such as crack propagation
Critical defect assessment including fitness for purpose and fracture mechanics calculations
There are 6 NDE methods commonly used in the offshore oil and gas industry:
| Visual | Surface inspection method |
| Liquid penetrant (LP) | Surface inspection method |
| Magnetic particle inspection (MPI) | Surface and slightly sub-surface inspection |
| Ultrasonics (including AUT) | Volumetric inspection method |
| Eddy current | Primarily surface inspection method |
| Radiography (RT) | Volumetric inspection |
NDE Operator Requirements
To ensure accuracy in the interpretation of data, essential prerequisites include:- NDE operator training, certification approval, track record (ASNT Level 2)
- NDE procedure approval
- Well maintained and calibrated equipment
- Reporting procedures and formatting of data
OSG’s consultants have gained considerable experience using the inspection methods mentioned above, in particular automatic ultrasonic inspection (AUT).