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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
N.P.S.H.A. is the net positive suction head available and must be _________ than N.P.S.H.R. the net positive suction head required.
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.
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then
Why is a minimum of net positive suction head (NPSH) required for a hydraulic pump?
Pick out the wrong statement. If the net positive suction head (NPSH) requirement of a pump is not satisfied, then
N.P.S.H. the net positive suction head, is calc. by the absolute suction head _________ the vapor pressure of the liquid being pumped.
Net positive suction head(NPSH) is provided because?
A centrifugal pump is fully primed, but on starting it fails to deliver fluid. The probable reasons are listed below: 1. Leaky foot valve or suction line 2. Suction head is very low 3. Insufficient motor speed 4. Damaged or closed delivery valve Which of these reasons are correct?
The static head of a centrifugal pump is equal to the _________ of suction head and delivery head.