Only a select few companies in the world offer both conventional and advanced inspection techniques.
Crestone NDT IS ONE OF THEM.
the two primary nde inspection techniques -
Saturated Low Frequency Eddy Current( SLOFEC ®)
-- Advanced inspection technique used when coating is involved, including fiberglass and rubber.
Magnetic Flux Leakage (MFL)
-- Conventional technique of inspection usually used in no coating situations.
slide to read more on these techniques
SLOFEC
MFL
what is mfl?
Magnetic Flux Leakage (MFL) inspection is a method of NDT used to detect and assess corrosion, pitting and wall loss in lined and unlined metallic storage tanks and pipelines.
Magnetic flux is the product of the average magnetic field times the perpendicular area that it penetrates. It is a quantity of convenience in the statement of Faraday’s Law and in the discussion of objects like transformers and solenoids.
In tank floor inspection, the floor of the tank is swept with the MFL tool. The area is flooded with magnetic flux and rare earth magnets are used to temporarily magnetize the steel while the magnetic field changes are recorded and analyzed. If the magnetic field is uniform, there are no flaws in the tank floor. If the magnetic field is distorted, internal or external flaws are present, such as pitting or corrosion and this distortion or “leakage” can be measured by the sensors.
Technicians proceed to mark areas that need to be verified by visual and ultrasonic inspections. The results obtained from the MFL inspection can be reported and used to establish an existing baseline for the equipment or to determine remaining wall and fit-for-service corrosion calculations in accordance with API, EEMUA and other applicable standards.
