Magnetic Flux Leakage (MFL) is an electromagnetic method of nondestructive testing that is used to detect and assess corrosion, pitting and wall loss in lined and unlined metallic pipelines and all parts of storage tanks. The floor of the tank is sweep with the MFL where powerful magnets are used to temporarily magnetize the steel and the magnetic field changes are recorded and analyzed from the chart. If internal or external flaws are detected, the magnetic flux distorts or “leaks” from the steel. Technicians proceed to mark areas that need to be verified by visual and ultrasonic inspections. The results obtained from the MFL inspections will be reported and can be used to establish an existing baseline for the equipment, or to determine remaining wall and fit-for-service corrosion calculations in according to API, EEMUA and other applicable standards.
Aboveground Storage Tank Inspections
The inspection of Aboveground Storage Tank (AST) is a requirement by the U.S. Environmental Protection Agency (EPA) and industry standards from the American Petroleum Institute (API) and the Steel Tank Institute (STI). EII provides comprehensive tank inspections consisting of visual inspections performed by a certified API 653 Inspector, including ultrasonic thickness testing, magnetic flux leakage testing, vacuum box testing, and settlement surveys.