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9.) The pressure head at A in pump A B is 120 ft when the energy change in the system (see Fig. 9-30) head through valve Z is 10 ft. Find all the flows and the elevation of reservoir Sketch the hydraulic grade lines.
10.) Solve the pipe network shown in the figure. The 12 in and 16in are of new cast iron, while the 18 and 24 in are of average concrete. Assume n=2.0 and use the values of f from figure 8.11 for complete turbulence. If the pressure at h is 80 psi, find the pressure at f.
5.) An old pipe, 600 mm I.D. and 1219m long, carries medium fuel oil at 30°C from A to B. The pressures at A and B are 393 kPa and 138 kPa respectively, and point B is 18.3 m above point A. Calculate the flow, using ∊ = 0.00049 m.
6.) A commercial solvent at 20°C flows from tank A to tank B through 152 m of new 150-mm asphalt-dipped cast iron pipe. The difference in elevation of the liquid levels is 7.0 m. The pipe projects into tank A, and two bends in the line cause a loss of 2 velocity heads. What flow will occur? Use ∊ = 0.00014 m.
7.) A 12-in-diameter new cast iron pipe is 1.0 mile long. Determine the discharge capacity of this pipe if the head loss is 24.5 ft using: a.) Hazen-Williams formula. b.) Manning formula.
1.) What size pipe will maintain a shear stress at the wall of 0.624 psf when water flows through 300 ft of pipe causing a lost head of 20.0 ft?
2.) Compute the critical velocity (lower) for a 100-mm pipe carrying water at 27°C.
3.) Water at 20°C flows in a 100-mm-diameter new cast iron pipe with a velocity of 5.0 m/s. Determine the pressure drop in kPa per 100 m of pipe and the power lost (in kilowatts) to friction.
4.) Water at 38°C flows from A to B through 244 m of average 300-mm-I.D. cast iron pipe (∊ = 0.00061 m). Point B is 9.1 m above A, and the pressure at B must be maintained at 138 kPa. If 0.222 m3/s is to flow through the pipe, what must be the pressure at A?
An open cylindrical tank 4 ft in diameter and 6 ft deep is filled with water and rotated about its axis at 60 rpm. How much liquid is spilled, and how deep is the water at the axis?
A reservoir supplies water to a horizontal 6′′ pipe 800 ft long. The pipe flows full and discharges into the atmosphere at the rate of 2.23 cfs. What is the pressure in psi midway in the pipe, assuming the only lost head is 6.20 ft in each 100 ft of length?
A 30 m steel tape was standardized at a temperature of 20°C and under a pull 5 kg. The tape was used in catenary at a temperature 25°C and under a pull of P kg. The cross-sectional area of the tape is 0.02 cm2, its weights per unit length is 22 g/m. Young’s modulus = 2 x 10-6 kg /cm2, α = 11 x 10-6 per °C. Find the correct horizontal distance, if P is equal to (i) 5 kg, and (ii) 11 kg.
A stadia measurement was undertaken with a theodolite having an internal focusing
telescope and stadia interval factor of 98.8. When a backsight was taken on a turning
point whose elevation is 205.62 m, the rod interval observed was 1.94 m; and with the
horizontal hairs set at 1.50 m on the rod, the vertical angle reading was +13045’. For a
foresight to a control point, the rod intercept was 1.17 m; and with the horizontal hair
reading of 1.60 m on the rod, the vertical angle observed was -7018’. Determine the
elevation of the line of sight at the instrument point and the elevation of the point on
which the foresight was taken.
A cable is suspended between two supports at the same elevation 250m high and 500 m apart. The load is 500 kg per horizontal meter including the weight of the cable. The sag of the cable is 50 m. calculate the total length of the cable.
8.) An air blower is to deliver 40,000 ft3/min. Two U-tube gages measure suction and discharge pressures. The suction gage reads a negative 2′′ of water. The discharge gage, located 3 ft above the point to which the suction gage is attached, reads +3′′ of water. The discharge and suction ducts are of equal diameter. What size motor should be used to drive the blower if the overall efficiency is 68% (γ = 0.0750 lb/ft3 for air)?
5.) Oil of specific gravity 0.750 is pumped from a tank over a hill through a 24′′ pipe with the pressure at the top of the hill maintained at 25.5 psi. The summit is 250 ft above the surface of the oil in the tank, and oil is pumped at the rate of 22.0 cfs. If the lost head from tank to summit is 15.7 ft, what horsepower must the pump supply to the liquid?
6.) Compute the lost head in a 150-mm pipe if it is necessary to maintain a pressure of 231 kPa at a point upstream and 1.83 m below where the pipe discharges water into the atmosphere at the rate of 0.0556 m /s.
7.) Water is pumped from reservoir A at elevation 750.0' to reservoir E at elevation 800.0' through a 12′′ pipeline. The pressure in the 12′′ pipe at point D, at elevation 650.0', is 80.0 psi. The lost heads are: A to pump suction B = 2.0 ft, pump discharge C to D = 38V2 /2g, and D to E = 40V2 /2g. Find discharge Q and horsepower supplied by pump BC.
