Centrifugal Pump operating problems that may cause damage to the centrifugal pump can be either hydraulic or mechanical. In the first category (hydraulic), a pump may fail to deliver liquid, it may deliver an insufficient capacity or develop insufficient pressure, or it may lose its prime after starting. In the second category (mechanical), it may consume excessive power or symptoms of mechanical difficulties may develop at the seal chambers or at the bearings or vibration noise or break-age of some pump parts. For example increased wear at the running clearances must be classified as a mechanical trouble but it will result in a reduction of the net pump capacity—a hydraulic symptom—without necessarily causing a mechanical breakdown or even excessive vibration. So it is important to classify symptoms and causes separately.