Задача id10770

The pump takes water at a temperature of 20°C from the reservoir in an amount Q = 50 l/s. Determine the maximum height of the horizontal pump shaft above the free surface of the water (Fig. ) if the pressure in the pipe in front of the pump is p2 = 0.3•105 Pa. The suction cast iron pipe with a diameter of d = 0.25 m and a length of l = 50 m has an intake mesh, a smooth turn with a radius of R = 0.5 m and a control valve open to 45% of the flow area.

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