Also known as: UTG, UTM, wall thickness measurement, thickness testing.
How it works
The gauge times the echo from the back wall and converts it to thickness using the calibrated sound velocity. Surveys repeat at the same CMLs over years, so the value of the data lies in consistency: the same location, the same method, comparable readings.
Where it is used
In-service inspection of piping circuits, pressure vessels and storage tanks under API 510, 570 and 653, and for fitness-for-service assessments.
Thickness gauging in AMPS
Because thickness data belongs to the asset, not just the job, in AMPS every asset and job carries a QR code. Scanning it opens the asset page and the history of jobs performed on it, assets can hold sub-assets, and jobs can be grouped, for example per shutdown. Previous survey reports are one scan away, and the flag system reminds the team when the next inspection is due.