The term flushing refers to the removal operation, by fluid transport, of various types of contaminants present inside pipes and / or equipment. In order to achieve this result, the carrier fluid is circulated through suitable pumps until conditions are obtained such as to guarantee the achievement of turbulent flow conditions for the transport of the contaminants. Flushing activities mainly concern the pipes of hydraulic and lubrication circuits; the flushing is carried out with a fluid compatible with the operating one.