Magnetic flux leakage

In the Magnetic Flux Leakage (MFL) method, a magnetising system applies a magnetic field to the item under test. Defects or discontinuities in the item distort this applied field, producing flux leakage. Sensors measure flux leakage and a recording system stores the measurements. Flux leakage measurements are analyzed to estimate the defect geometry and severity.

Applications of Magnetic Flux Leakage (MFL)

MFL inspections are typically used to detect, locate, and characterize metal-loss and other anomalies in natural gas-transmission pipelines, bulk fuel storage tank floors and other petrochemical industry applications.

MFL principle  MFL principle