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Principle Theory of MTM :
- Local stresses (either from physical defect or non physical) will cause changes in magnetic field strength.
- Measurement of magnetic field strength to evaluate the local stresses degree of danger.
- Assessment of Stress Deformed State base on
- Magnetoelastic effect (Villary effect)
- Villary Effect – The Higher the mechanical stress, The Higher the magnetic field intensity
Principle Benefits
Technical :
- NO need for special equipment or preparation
- NO contact with change to the mode of pipeline
- NO limit to length of pipeline inspected (preferably 100 m & above)
- Identifies ALL metal defects irrespective of orientation
- Suitable for ALL ferromagnetic pipelines including tight turns and various diameters
- NO need to equip pipeline with a pig launcher or receiver/trap
Operational :
- NO interruption to pipeline operation
- NO minimum or maximum operating pressure required
- NO need for pipeline cleanout
- NO need for inner surface preparation
- NO need to open a section of pipeline to recover a trapped pig.