Aboveground storage tanks are subject to regular inspections prescribed by the applicable codes such as API 653 and EMUUA 159. It is well known that the tank bottoms are typically inspected using Magnetic Flux Leakage (MFL) floor scanners such as the Floormap®X. These sensitive tools enable the detection of the smallest pits and flaws. When it comes to the tank roofs, the damage mechanisms are quite different. Roof plates are thinner and subject to generalized corrosion. Different inspection techniques are
Source: NDT