An 8 metre Diameter Fire WATER Tank was required to have a robotic Tank Floor Inspection conducted to extend the endorsement as the tank was due major overhaul but could not be removed from service due to operational ullage requirement.
Fire Water Tank 8m – SONAR Online
OUTCOME
8 months later the tank was removed from service and internally inspected. The results of the two
inspections were as follows:
The In-Service Robotic Inspection of the 8m Fire Water Tank with sludge up to 0.3m provided data that when projected forward to the time of the Out of Service UT was deemed to be incredibly accurate and comparable.
A difference of 0.02 mm could be considered to be within the uncertainty
of a manual UT reading and the percentages difference between the two methodologies was less than 1% using HOIS Statistical Analysis of Corrosion Data.
