Crestone NDT


"NDT - Done Better"

Only a select few companies in the world offer both conventional and advanced inspection techniques.


the two primary nde inspection techniques -
Saturated Low Frequency Eddy Current

-- Advanced inspection technique used when coating is involved, including fiberglass and rubber.

Magnetic Flux Leakage

-- Conventional technique of inspection usually used in no coating situations.

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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.

we provide a full array of NDE Technology

NDE technology refers to an array of non destructive techniques (NDT) and processes to monitor, probe and measure material response.

Ultrasonic Testing
Ultrasonic testing uses high-frequency sound waves called ultrasonic pulse waves to detect flaws or other imperfections or defects in metal components, and it can also be used to identify and monitor changes like shifts in thickness within the components that may result in failure or other problems in the future.
Magnetic Particle Testing
MPI can be used in metals that have magnetic properties and works by issuing a magnetic field into the component being tested – essentially magnetizing the component.
Liquid Penetrant Testing
In this method, a penetrant is used and is allowed to “soak in” for a prescribed period of time to help reveal defects that extend below the component’s surface. LP is one of the most popular techniques and is widely accessible to companies of all sizes.
Radiographic Testing
RT uses x-rays or radioactive isotopes to evaluate components and works by sending the radiation through the component and measuring the amount that emerges on the opposite side.

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