Your Trusted Non-Destructive Testing Partner
Qualisight provides expert non-destructive testing services across various industries, ensuring quality, safety and compliance through qualified personnel and advanced inspection equipment.
Magnetic Flux Leakage (MFL)
Magnetic Flux Leakage - Tube inspection
Non-destructive testing of tubing and surfaces relies on several techniques, which often depend on the application and the materials involved. By utilizing a single or combination of the following testing technologies, qualisight has all the capabilities to inspect your tubular equipment according to your national and international standards.
Magnetic flux leakage (MFL) is a tube-testing technique primarily designed for the rapid testing of ferromagnetic tubes with non-ferromagnetic fins wrapped around them, such as in air fin coolers. Two strong magnets generate a static magnetic field that saturates the tube wall (Fig. 1 ). When a flaw (pitting, wall loss, etc.) is located between the two magnets, the magnetic flux in the tube wall is disturbed and a small amount of flux will leak into the inner tube. This leakage of flux is detected by the coils placed between the magnets. The variation of the flux leakage induces current in the coils, thereby causing a signal output. This signal output can be used to provide information on any wall-thickness reduction in the tube. Magnetic flux leakage (MFL) is mainly applied in the inspection of air fin coolers, but it can also be used for inspecting bare tubes with diameters of one inch (2.5cm) and above.
Scheduled shutdowns present an opportunity for planned inspection programs which enable continued operation of critical plant equipment by minimizing unexpected failures. Prior to deciding which techniques are most suitable for your needs the following items should be considered: number of tubes to be inspected; cleanliness of tubes and time available for inspection.
Magnetic Flux Leakage - Tank floor Inspection
Magnetic flux leakage (MFL) is commonly used for inspecting tank floors in the petrochemical industry. Corrosion of the tank floor can lead to the loss of product and cause damage to the environment. Therefore, it is vital that tank floor inspections are carried out in order to prevent the occurrence of such problems.
MFL provides a cost-effective and high-speed inspection of tank floors. Our qualified MFL inspectors are backed by years of experience. The method uses permanent or electromagnets to magnetise the tank floor and the resulting magnetic field changes are recorded and analysed. If there is corrosion, pitting or wall loss, the magnetic field ‘leaks’ and the ‘leakage’ is analysed to determine the location and severity of the defect of the tank floor – both near and far surface. A map of the corroded areas is provided with the MFL method and this essential data can be stored for future reference and planning.
ADVANTAGES
Determining Corrosion Growth Accurately and Reliably.
Magnetic flux leakage as applied to aboveground storage tank flat bottom tank floor inspection.
Conventional NDT methods
Advanced NDT methods
Third Party Inspection Services