Magnetic Flux Leakage (MFL) Testing

What is Magnetic Flux Leakage (MFL) testing?

Magnetic Flux Leakage (MFL) is a non destructive testing (NDT) technique where electromagnetic energy is applied to equipment in order to detect flaws. Using this method, both top-side and bottom-side corrosion, as well as other damage resulting in material loss can be detected in both lined and unlined ferrous metallic pipelines and storage tank floors. As these pieces of infrastructure effectively form the backbone of our industry, Magnetic Flux Leakage (MFL) testing is invaluable in keeping them in working condition.

Magnetic Flux Leakage (MFL) inspection works by applying magnets, which can be either permanent magnets or electromagnets, to a piece of equipment. The electromagnetic energy is adjusted to saturate the material for the given thicjkness. As a result any changes in thickness such as that due to corrosion cause the field to be forced out of the item.. These “leakage fields” may then be detected using Hall effect sensors. The major advantage Magnetic Flux Leakage (MFL) inspection holds over other nondestructive techniques is that it can detect corrosion and other damages not only on the surface of the pipe or tank floor, but on the iopposite side as well.

Magnetic Flux Leakage (MFL) Training Objectives:

This Magnetic Flux Leakage (MFL) testing course provides the knowledge required to operate equipment and perform manual & encoded Magnetic Flux Leakage (MFL) testing method. The course covers theoretical aspects on MFL application, its advantages and limitations. It also includes requirements of code & standards. The course also covers in depth practical aspects for application of Magnetic Flux Leakage (MFL) in Pipes & Tank Floor using required accessories such as calibration blocks, validation samples, encoders, scanners etc.

 Non Destructive Testing (NDT) Training Course Outline:

Days: 12 days training and 2 day exam (2 day introduction included)
Duration: 96 hours

General Topics:

  • Introduction to Non-Destructive Testing; History & Introduction to Magnetic Flux Leakage (MFL); Overview of MFL.
  • History and Principles of Magnetism; Magnetic Fields; Fields around current carrying conductors; Magnetic-Domains; Magnetisation of materials.
  • Magnetisation methods; Magnetising by means of electric current; Magnetising by means of permanent magnets.
  • Hysteresis; Magnetic properties of materials; Permeability and reluctance; Magnetic saturation; Flux Leakage Detectability.
  • Indications; Search units; Coils; Hall Effect sensors; Signal processing; Data Presentation; Eddy Currents.
  • Introduction to storage tanks; Types of tanks; Storage tank components; Damage mechanisms in storage tanks.
  • Tank floor layouts; Tank cleaning requirements; Inspection of Storage Tanks;
  • Common defects on storage tank floors; Corrosion, origins, & categories; Laminations; Inclusions; Mechanical damage.

Who Should Attend?

  • Should be High School graduate of science branch (minimum recommended level of education
  • Should have a minimum experience of 160 hours in method.
  • Certificates: Near Vision acuity (Jaeger Number 2 or Ortho-Rater 8), and Color Contrast
  • Differentiation has to be submitted at the time of registration.


Certification awarded for those who complete General, Specific and Practical examinations with an aggregate average of 80%.

You can see Course Schedule: –> Upcoming NDT Training Course

or You can see more: –> Phased Array Ultrasonic Testing