Abstract
Its well known erosion caused by cavitation leads to increased wear of details. Investigation of erosion place of origin is intensive and complex problem. Therefore using of simple methods of cavitation diagnosis is very actual. One of these methods is vibroacoustical diagnosis which take into account not only noise occurred due to working process but also pressure pulsation of working fluid and vibration of system components. Noise measurement may locate their source thereby determine the most acoustically loaded details of the investigated unit. 
 This paper describes some questions of cavitation influence on external acoustic field in combined pump unit. We proposed the method for cavitation diagnosis in combined pump unit. This method is based on measurement of external acoustic field. This method showed high accuracy and ease of use. The experimental studies have established a connection between pulsation characteristics of the pump unit and an external acoustic field.
 
 Key words: pump unit, combined air, cavitation, erosion acoustic visualization
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