design of jet fuel tank design of jet fuel tank military aircraft

At each display threshold, the owner calculated the time, material, and labour costs required to repair the corroded areas, able to make informed decisions based on repair costs versus expected service life.ĭue to the semi-buried nature of this storage tank, the asset owner was able to take more cost-effective measures than replacement offered. The software was set to display defects with more than 40, 50, or 60 percent loss. The tank owner was able to leverage the reporting software to make several cost calculations based on different repair scenarios by using the corrosion display filters. Inspection results showed that, except for the floor plates, the tank was in relatively good condition considering its age.

The area was excavated and repaired externally. Visual inspection of the roof lining did not reveal any suspect areas however, a continuously damp area on a floor plate led to the detection of a roof leak. This was remedied using a “chemical metal” compound. Although the perforation in the weld was extremely small, it was easily identified by a characteristic circular damp area caused by leaked product being drawn back into the tank due to capillary action. A leak was noted on a shell plate weld during this inspection. Ultrasonic testing was employed to survey the tank shell with no significant thinning detected. Despite the severity of corrosion, non-destructive testing inspection results showed that most of the corroded regions were limited to isolated or localized areas, so the storage tank was deemed repairable.

Several coupons were selected to be cut from the floor, and physical measurements verified the accuracy of the data results. The most severe corrosion was recorded at 75 percent loss of the nominal plate thickness. However, a magnetic flux leakage or MFL survey identified multiple areas of the tank floor that had been attacked by underfloor corrosion. Visually, the floor plates appeared to be in excellent condition considering the age of the large fuel storage tank. With access provided to the cleaned tank, the inspection was performed utilizing advanced non-destructive testing instruments.

Design of jet fuel tank design of jet fuel tank military aircraft