Sigma provides ASNT/PCN/NAS-410 Level I, II, & III technicians and inspectors for Eddy Current Testing (ECT) to detect anomalies and metal loss in heat exchanger tubes.

ECT is an NDT/NDE method using electromagnetic induction to detect and characterize surface and sub-surface defects/flaws and corrosion/erosion in conductive materials.

In a standard eddy current testing a circular coil carrying current is placed in proximity to the test specimen (which must be electrically conductive). The alternating current in the coil generates a fluctuating magnetic field which interacts with the metal tube and generates an eddy current. Variations in the phase and magnitude of these eddy currents can be monitored using a second receiver coil, or by measuring changes to the current flowing in the primary excitation coil.

The technician analyses these measurements to determine the mechanical integrity of the tube and makes a pass/fail recommendation for plugging.

Certified technicians are available for call-out or long-term assignments. Sigma provides turnkey ECT inspection and reporting complete with equipment, consumables, vehicles (mileage), and accommodations required to perform Tubular Testing.