Mistras PHAT Scan©

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5 Deploys

In-service storage tank inspection

Page last modified
February 22 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
1
With PHAT Scan © the storage tank still remain operational
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PHAT Scan© has a high level of reproduce ability, measurements from the past can be compared with current measurement data
1
With aid of PHAT Scan© reports and plots, local repairs can be scheduled in advance of planned “out-of-service” inspection
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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”)
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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)
0
A level of cleanliness is required
0
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

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Technology Readiness Level

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[9/9]

Development Technology demonstration Mature / Proven
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MISTRAS Group is one of the world's largest suppliers of integrity and inspection services. We specialise in providing innovative asset integrity solutions for all projects using enhanced services that include asset monitoring, advanced and conventional NDT

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