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Mistras PHAT Scan©
In-service storage tank inspection
Page last modified
March 14 2023
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.
Pro/con
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
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
Relative Business Impact
Technology Readiness Level
[9/9]
Development
Technology demonstration
Mature / Proven
Technology deployed by:
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