Mistras PHAT Scan©

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Deployed by 5 companies

In-service storage tank inspection

Page last modified

April 11 2024

PHAT Scan© is a NDT examination technique used for non-invasive and in-service inspection of the internal shell-to-bottom connection (corner weld) on above ground storage tanks and/or the annular critical weld region of the annular plate.

With PHAT Scan © local corrosion damage caused by a tear-shaped storage medium and crack like indications, in which the crack orientation perpendicular to the vessel wall is due to low cyclic fatigue, can be recorded. On-stream / non-intrusive inspection (NII) technology.

Pros & Limitations

With PHAT Scan © the storage tank still remain operational

PHAT Scan© has a high level of reproduce ability, measurements from the past can be compared with current measurement data

With aid of PHAT Scan© reports and plots, local repairs can be scheduled in advance of planned “out-of-service” inspection

With PHAT Scan © crack-like indications, pit shaped corrosion and pitting of shell plate can be detected and sized from an indication depth/height of approximately 1,5 mm (0,06”)

With PHAT Scan © local corrosion damage caused by a tear-shaped storage medium and crack like indications, in which the crack orientation perpendicular to the vessel wall is due to low cyclic fatigue, can be recorded. (On-stream technology)

A level of cleanliness is required

Not ATEX proof

Specification

Specification Title	Specification Description
Application	Above ground storage tanks.
Inspection	The internal shell-to-bottom connection (corner weld) and/or the annular critical weld region of the annular plate
In-service inspection possible	Yes, in-service inspection available with PHAT Scan©
Accuracy	Accuracy of the remaining annular plate thickness measurement is 10%. Crack-like indications, pit shaped corrosion and pitting can be detected and sized from an indication depth/height of ± 1,5 mm (0,06”)
Temperature	From 5°C till 50°C.
Areas of Application	Shell and annular plates within the storage tanks.
Repeatability	Measurements from the past can be compared with current measurement data.
Compliance	EEMUA 159 / API 653