1. A 50 mm by 25 mm Venturi meter is installed in a 50 mm diameter horizontal pipe to measure the flow of a certain liquid (sp. gr. 1.30). A differential manometer connected with the inlet and throat of the Venturi meter contains a liquid substance (sp. gr. 2.5) in the lower part of the tube, the remainder of the tube being filled with the certain liquid. The difference in height of substance columns in the two legs of the manometer is 25 cm. If the coefficient of the meter is 0.96, compute the actual discharge and the headloss in the Venturi meter.
1. A 50 mm by 25 mm Venturi meter is installed in a 50 mm diameter horizontal pipe to measure the flow of a certain liquid (sp. gr. 1.30). A differential manometer connected with the inlet and throat of the Venturi meter contains a liquid substance (sp. gr. 2.5) in the lower part of the tube, the remainder of the tube being filled with the certain liquid. The difference in height of substance columns in the two legs of the manometer is 25 cm. If the coefficient of the meter is 0.96, compute the actual discharge and the headloss in the Venturi meter.
2. A 50 mm Venturi meter (C = 0.96) is installed in a 100 mm diameter horizontal pipe carrying oil having a specific gravity of 0.82. If the recorded actual flow in the Venturi meter was 15 liters per second, what could have been the deflection of water in the differential manometer connected between the inlet and the throat? Determine the headloss in the Venturi meter.
3.A fire pump delivers water through a 100 mm main to a hydrant to which is connected a 50 mm hose, terminating in a 20 mm nozzle. The nozzle is 5 m above the hydrant and 20 m above the pump. Assuming a total frictional loss of 20 m from the pump to the base of the nozzle, and a loss in the nozzle of 20 per cent of the velocity head in the jet, and neglecting air resistance, what gage pressure at the fire pump is necessary to throw a stream 25 m vertically above the tip of the nozzle?
4. A 75 mm diameter fire hose discharges water through a nozzle having a jet diameter of 25 mm. The lost head in the nozzle is 25% of the velocity head in the jet. If the pressure at the base of the nozzle is 625 KPa: compute the discharge in m3/min; the maximum horizontal range to which the stream can be thrown; the maximum vertical reach, and the diameter of the jet at a point two-third of the maximum vertical reach from the tip of the nozzle. Neglect air resistance.
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