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Q1. A centrifugal pump delivers 900 tonne of sea water per hour. The impeller has an inlet width of 80 mm and an exit diameter of 440 mm. When running at 720 rev/min the radial flow velocity of the water is constant at 3.2 m/sec and the absolute velocity at exit is 9 m/sec.

Calculate EACH of the following:

(a) The impeller diameter at inlet;

(b) The inlet angle of the impeller vanes for shock-less flow;

(c) The exit angle of the impeller vanes for shock-less flow.

Note: Density of sea water = 1025 kg/m³.