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N.P.S.H. requirements could be _________ by utilizing an inducer, a low head, axial flow impeller utilized in front of the impeller of a centrifugal pump.

N.P.S.H. requirements could be _________ by utilizing an inducer, a low head, axial flow impeller utilized in front of the impeller of a centrifugal pump. Correct Answer Reduced

N.P.S.H. is particularly relevant inside centrifugal pumps and turbines, which are parts of a hydraulic system that are most vulnerable to cavitation. If cavitation occurs, the drag coefficient of the impeller vanes would increase drastically – possibly stopping flow altogether – and prolonged exposure would damage the impeller.

Related Questions

Consider the following statements pertaining to centrifugal pumps: 1. The inlet to the impeller of a centrifugal pump is always axial, while the outlet may be radial or inclined. 2. The impeller may be shrouded on both sides with an eye at the center and vanes curved backward. 3. Impeller of double-entry type has a balanced radial thrust. 4. Un-shrouded and part-shrouded impeller are used only where high efficiency is unimportant. Which of these statements are correct?
Two centrifugal pumps P and R are available for use in a pipe flow system and their head-discharge characteristics are as follows. Pump P Pump R Discharge (cumecs) Head (m) Discharge (cumecs) Head (m) 0 40 0 45 0.12 35 0.14 40 0.2 28 0.24 35 0.3 18 0.3 28   The following statements (S1, S2, and S3) pertain to the head and discharge values during actual operation. Neglect losses in the system. Which of the following statements are correct? S1: When the two pumps P and R are connected in parallel, the discharge is 0.36 cumecs corresponding to a head of 35 m. S2: When the two pumps P and R are connected in parallel, the discharge is 0.36 cumecs corresponding to a head of 70 m. S3: When the two pumps P and R are connected in series, the discharge is 0.3 cumecs corresponding to a head of 46 m.
The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the
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Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)
Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet and Vf = Velocity of flow at inlet)