The inner and outer diameters of the impeller of a centrifugal pump are 25 and 50 Cm respectively. The pump discharges 8 m of water per minute while operating at 550 rpm against a head of 12 m. The diameter of the discharge outlet is 15 cm. The outlet diameter of the backward curved impeller vane is 40°. The flow area from the impeller inner to outer radius is constant and is equal to 750 cm2. Draw the velocity triangles and calculate: i. Inlet angle of the vane ii, Hydraulic efficiencies based on static head, and on total head. iii, Minimum speed for starting the pump in rpm.

Structural Analysis
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Chapter2: Loads On Structures
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The inner and outer diameters of the impeller of a centrifugal pump are 25 and 50 cm
respectively. The pump discharges 8 m2 of water per minute while operating at 550 rpm
against a head of 12 m. The diameter of the discharge outlet is 15 cm. The outlet diameter of
the backward curved impeller vane is 40°. The flow area from the impeller inner to outer
radius is constant and is equal to 750 cm2. Draw the velocity triangles and calculate:
i.
Inlet angle of the vane
i,
Hydraulic efficiencies based on static head, and on total head.
ii,
Minimum speed for starting the pump in rpm.
Transcribed Image Text:The inner and outer diameters of the impeller of a centrifugal pump are 25 and 50 cm respectively. The pump discharges 8 m2 of water per minute while operating at 550 rpm against a head of 12 m. The diameter of the discharge outlet is 15 cm. The outlet diameter of the backward curved impeller vane is 40°. The flow area from the impeller inner to outer radius is constant and is equal to 750 cm2. Draw the velocity triangles and calculate: i. Inlet angle of the vane i, Hydraulic efficiencies based on static head, and on total head. ii, Minimum speed for starting the pump in rpm.
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