This method is commonly used for the inspection of non-ferromagnetic tubes in heat exchangers. The inspection is done with a bobbin coil, the coil produces an electromagnetic field in the tube. When the probe is pulled along a discontinuity, the electromagnetic field is distorted. This distortion in the electromagnetic field changes the coil impedance related to the discontinuity. For special defects or defects inside tube sheets a rotating probe is used.

Detectable defects:

• Wall thickness reduction
• Local pitting
• Cracks
• Erosion/corrosion
• Baffle hammering

Inspection techniques:
internal coaxial probe, rotating probe

JSC Inspections – we offer Non-Destructive Testing and Inspection Services for clients in the oil-, gas- and petrochemical industries, the chemical industry, the energy sector and the construction of pipelines and structures industry.