MISTRAS Group

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As the world leader in Acoustic Emission (AE) technology, MISTRAS has performed thousands of field tests on pressure vessels, storage tanks, pipelines, valves, nuclear lift rigs, railroad tank cars, bridges, compressed gas cylinders, transformers, and much more. Our extensive database for interpreting the significance of AE signals, as they relate to flaws and leaks, has led to the development of knowledge-based systems such as MONPAC™, GasPAC™, TankPAC™, ADTI™, and TT™.

MISTRAS Group has maintained a strong commitment to leak detection.  The many years of experience with a wide range of products have been combined to develop versatile cost-effective leak detection instrumentation for the prevention of destructive accidents. MISTRAS Group’s mission is to be the leading “one source” global provider of technology enabled asset protection solutions used to evaluate the structural integrity of critical energy, industrial and public infrastructure.

Acoustic emission (AE) is a nondestructive testing (NDT) technique which allows an operator to predict when a material under stress will fail. Many codes and standards exist for AE testing of vessels, from transportation gas cylinders and railroad tank cars, to 30,000 ton storage tanks. The method uses sensors which detect the high-frequency signals that result from structural defects 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 do not threaten structural integrity.

Every material “talks” under stress; audible acoustic emission signals occur when paper is torn, glass is broken or wood is cracked. Leaks also emit AE, but usually well above the human-hearing range and long before a physical defect is seen. Acoustic emission is the ideal preventive maintenance technique to monitor and detect leakages for applications requiring non-intrusive testing.

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