Eddy Current Testing is a non-destructive inspection technique used for evaluation of non-ferromagnetic heat exchanger tubes. ECT is highly sensitive to surface and near-surface defects and is widely used for detection of corrosion, pitting, cracking, and wall thinning in materials such as copper alloys, aluminium alloys, and austenitic stainless steels.
ECT provides fast, accurate, and repeatable inspection results, making it a preferred method for routine inspection of non-ferrous heat exchanger tubes.
Why Eddy Current Testing Is Required
Many heat exchanger tube failures initiate internally and are not visible externally. Eddy Current Testing allows early detection of defects that could otherwise lead to tube leakage or rupture. It helps identify localized corrosion, pitting, and cracking before failures occur and supports proactive maintenance strategies.
Scope of Inspection
ECT is applicable to:
Non-ferromagnetic heat exchanger tubesCondenser and cooler tubesBrass, copper alloy, aluminium, and austenitic stainless steel tubes
Inspection Methodology
Eddy Current Testing is performed by passing a specially designed probe through the tube length, generating electromagnetic fields that interact with the tube material. Variations in tube condition such as wall thinning, pitting, or cracks cause changes in the electromagnetic response, which are recorded as signals.
The inspection data is continuously acquired along the full tube length and analysed to identify defect type, location, and severity. Advanced signal processing and calibration standards are used to improve accuracy and reliability. Results are interpreted by trained inspectors and reviewed by engineers to support tube integrity evaluation and maintenance planning.
Key Benefits
ECT provides high sensitivity to internal defects, rapid inspection of large tube bundles, reliable detection of pitting and corrosion, and minimal downtime during inspection.
Industries and Applications
Eddy Current Testing is widely used in refineries, power plants, petrochemical units, fertilizer complexes, and chemical processing industries for inspection of non-ferrous heat exchanger tubes.
Eddy Current Testing offers an effective and proven solution for assessing the condition of non-ferromagnetic heat exchanger tubes. By enabling early detection of degradation, ECT supports safe operation and optimized maintenance planning.
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