A centrifugal pump is to deliver 4.6 m3/s when running at 750 rpm. The diameter of the impeller at inlet is 53 cm and at outlet is 76 cm. It may be assumed that the air enters radially with a speed of 15 m/s. the vanes are set backwards at outlet at 700 to the tangent, and width at outlet is 10 cm. the volute casing gives at 30% recovery of the outlet velocity head. The losses in the impeller may be taken as equivalent to 25% of the outlet velocity head. Blade thickness effects may be neglected. Determine,
(i) The manometric efficiency and
(ii) The pressure at the discharge.