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ULTRASONIC TESTS

 

The tests are based on sounds beyond our hearing threshold. The ultrasound detectors turn high frequency sounds (which we cannot hear) into sounds within the audible range - the sounds that are heard by humans. The technique complements well other known techniques, such as thermography, Ferrography and vibration analysis.

 

Main uses in the maintenance world

 

As an indication of air and gas leaks from tanks and piping. Any gas leakage from a crack or tiny hole produces a US sound, which makes it possible to discover the source of the leak. The tests are useful in the cases of compressed air, toxic gases, such as ammonia and chlorine, and expensive gases, such as argon, hydrogen, and helium.

 

As a marker of the integrity of steam boilers, steam lines, and steam traps. The presence of water in the steam is a problem that steam facilities face, and they are separated by a trap. The ultrasonic detector hears the flow of steam and indicates faults, such as a stuck or blocked valve.

 

As a marker for detecting phenomena such as corona and arcing, electrical outbreaks, sparks, and ionization. These phenomena in high voltage systems, transformers, and switching devices indicate defects in insulation and may cause a fire to develop.

 

As an additional aid for indicating mechanical predicted maintenance, by comparing the noise of transmissions and engines with that of a normal assembly.

As a marker of the airtightness of clean rooms. The examiner produces a strong US sound inside the room and listens to it behind

a "closed" door. The sound will "look" for cracks in the seal and reach the examiner, who is equipped with a detector.

 

The ultrasound technology is well integrated with other existing technologies and contributes an additional dimension to predicted maintenance.

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PMDS Oil and Thermography Laboratories

PMDS

Institute for Monitoring Wear, The Industrial Research Center Building,

Technion City, Haifa

PO Box 9313, Haifa 3109202

Tel: 04-8221466

Fax: 04-8221467

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