AE Testing

Acoustic Emission (AE) testing is a nondestructive method for evaluating the condition of numerous structures.  The method uses sensors that detect the high-frequency signals that result from deterioration in the structure when subjected to load. The signals may result from local overstress, crack growth, corrosion product, and leaks. Normally, AE inspection is carried out during a controlled increase in operating load, during cool-down or controlled temperature change where thermal stresses are significant. Because only active defects and deterioration produce AE, no time is wasted on inactive defects that are not threatening structural integrity.

Benefits of AE Testing

Global Monitoring - Sensors detect AE signals from considerable distances, making this method ideal for global monitoring of large vessels and systems. Identified problem areas can then be inspected using other NDT methods.

Minor Disturbance of Insulation - Only small holes in insulation are required for sensor mounting. On high-temperature applications, waveguides are used to contact the surface. Sensors are then mounted outside the insulation.

On-Line Testing - For most storage vessels, on-line testing is possible either by filling it with product, introducing gas into the vapor space, controlling the temperature or other process parameters.

Cost Reduction - The use of AE can reduce plant maintenance costs considerably, while increasing the information available about plant integrity. Plant downtime for inspection is also minimized.

Rapid Inspection - The actual AE test takes a matter of hours, and in some cases, considerably less. No comparable method can provide 100% volumetric inspection in the same amount of time.

Permanent Record of Test - Data is digitized and stored on disc, providing a permanent record of the test which can be reanalyzed at any time.