Corrosion Behavior of Bottom Plates of A potable Water Storage Tank
Engineering and Technology Journal,
2008, Volume 26, Issue 6, Pages 682-688
AbstractThis paper describes the investigation of a corrosion behavior of bottom Plates of a
potable water storage tank . The tank was internally inspected for the first time after
fourteen years of service. Paint blisters and rust spots were observed on the bottom
plates. Sand blasting and repainting the bottom plates and shell plates were to be used
as a remedial work .
However, during the sand blasting, holes and deep pitting were observed on the
bottom plates. On-site visual inspection, magnetic flux leakage (MFL) inspection,
ultrasonic testing (UT), and evaluation of the external cathodic protection (CP) system
were used in the failure analysis. The failure is attributed to the ingress of water and its
impoundment under the tank bottom along the periphery inside the ring wall and failure
of water side epoxy coating.
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