The top floor of an office building is 40 m above street level and is to be supplied with water from a municipal pipeline buried 1.5 m below street level. The water pressure in the municipal pipeline is 450 kPa, the sum of the local loss coefficients in the building's pipes is 10.0, and the flow is to be delivered to the top floor at 20 L/s through a 150 mm diameter PVC pipe. The length of the pipeline in the building is 60 m, the water temperrature is 20 degrees C, and the water pressure at the top floor must be at least 150 kPa. Will a booster pipe be required for the building? If so, what power must be supplied by the pump?

1.1) A pump draws water from an open reservoir, with a static suction head of 26.24 feet, and lifts it to another open reservoir with a static discharge head of 25 meters. The diameter of the suction pipe is 15.24 cm and the diameter of discharge pipe is 4.0 inches. The total head loss from A to B is 25 % of the total dynamic head (TDH), and the head loss at the discharge side of the pump is 90 % of the total head loss. The pump capacity is 50 lps. Determine: a) the pump brake power if the efficiency is 82 % b) the reading of the pressure gauge installed at the suction side of the pump c) the reading of the pressure gauge installed at the discharge side of the pump.

Oil of specific gravity 0.85 flows freely from a tank through a 60 mm diameter pipe. The oil surface elevation is 4 meters above the pipe. The total head loss between in the system is 2.0 meters. Determine the discharge in the pipe in liters per second.

COMPLETE SOLUTION   1. A venturi meter is introduced in a 300 mm diameter horizontal pipeline carrying a liquid under a pressure of 150 kPa. The throat diameter of the meter is 100 mm and the pressure at the throat is 400 mm of mercury below atmosphere. If 3% of the differential pressure is lost between inlet and the throat, determine the flow rate of the pipeline. 4. An rectangular orifice with height 0.4 m and width of 0.6 m was used to measure the flow of a certain channel. Flow was controlled such that the entirely of the discharge will be focused and exit on the orifice. Upon stabilization of conditions, it was observed that the height of the water above the orifice can be taken as 1.2 meters and for a certain section upstream before the orifice, velocity can be considered constant at 1.7 meters per second. Assume your own water temperature and compute for the stream discharge considering a discharge velocity of 0.6812.

The pressure in a 3 cm diameter pipe is 400 kPa. What is the velocity of flow in the pipe?

The minimum temperature of the water is 5 °C, the free chlorine residual in the effluent from the basin is to be 2 mg/L, the first-order decay coefficient for chlorine is assumed to be 0.2 h-¹, and the flow rate is 1.5 x 104 m³/d. The pH of the water varies between 7.2 and 8.0. Make the calculations for a plug-flow basin. Cta values for achieving 99.9% reduction of Giardia lamblia Temperature (°C) Disinfectant pH ≤1 5 10 15 20 25 Free chlorineb 6 165 116 87 58 44 29 (2 mg/L) 7 236 165 124 83 62 41 8 346 243 182 122 91 61 9 500 353 265 177 132 88 Ozone 6-9 2.9 1.9 1.4 0.95 0.72 0.48 Chlorine 6-9 63 26 23 19 15 11 dioxide Chloramine 6-9 3800 2200 1850 1500 1100 750 (preformed) aC is in mg/L and t is in minutes Ct values depend on the concentration of free chlorine Calculate the dosage of chlorine kg/day) and the detention time minutes) required for 99.9% reduction of G. lamblia. 121.5 486 118 91 40 45 151.5

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Three new cast-iron pipes connected in series have diameters of 30 cm, 25 cm, and 20 cm, each being 200 m long. The largest pipe leads from a reservoir and the smallest discharges into the air. Determine the total head loss when the discharge is 100 liters per second. What must be the elevation of the outlet end of the pipe with respect to the water surface elevation in the reservoir? n for Manning’s equation is 0.011 and the minor head loss due to contraction is 30% of the velocity head on the pipe after the change in cross in the direction of flow. Draw the approximate EGL and HGL.

A smooth concrete pipe with a 1.5 ft diameter carries carbon tetrachloride at 20 C from a tank to a facility 1 mile away, where it discharges into the air. The pipe begins in the tank 3 feet below the surface and descends on a 1:100 (vertical: horizontal) slope. Determine the flow rate, assuming minor losses are negligible.

1. Because of elevation differences, the water pressure in the second floor of your house is lower than it is in the first floor. For tall buildings, this pressure difference can become unacceptable. Discuss possible ways to design the water distribution system in very tall buildings so that the hydrostatic pressure difference is within acceptable limits