Department of Civil Engineering
College of Engineering and Technology
Visca, Baybay City, Leyte, PHILIPPINES
Telephone: (053) 525-0140 local 1015
Email: dce@vsu.edu.ph
Website:www.vsu.edu.ph
CEng 137-Hydraulics
1st Semester, AY 2020-2021
Plate No. 3
Fluid Flow in Pipes
Instruction: Answer the following problems using the attached template. Do not forget to BOX
your final answer. Scan your answer sheets and submit through VSU ELearning Portal. Only in
.pdf file format will be accepted.
Sheet 1
Problem 1. The velocity of oil flowing thru a 30 mm diameter pipe is equal to 2 m/s. Oil has a
kinematic viscosity of 5x10-5 m2/s. If the pipe has a length of 120m.
a. Compute the Reynolds Number
b. Compute the friction factor
c. Compute the head loss of the pipe.
Problem 2. The head loss of a 120m length of tube having a diameter of 10 mm is 30 m. Oil flows
through the tube at a Reynold’s Number of 1800.
a. Compute the friction factor
b. Compute the Kinematic Viscosity of the fluid in m2/s
c. Compute the discharge in liters/min.
Sheet 2
Problem 3. The 100 m duct is 60 mm in diameter. If the fluid has a density of 920 kg/m 3 and a
viscosity of 0.29 Pa.s.
a. Compute the velocity of flow on the duct
b. Compute the Reynolds number
c. Compute the discharge
Problem 4. A new cast iron pipe must carry 1.2 m3/s at a head loss of 5m per km length of pipe.
Compute the diameter of the pipe using:
a. Hazen Williams Formula with C=120
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b. Mannings Formula with n=0.012.
c. Darcy Weishback Formula with f=0.021.
Sheet 3
Problem 5. A 1-meter diameter new cast iron pipe 845 m. long has a head loss of 1.11 m.
a. Find the discharge capacity for this pipe using Hazen Williams formula with C=130.
b. Find the discharge capacity using Mannings Formula with n=0.013.
c. Find the discharge capacity using Darcy Weishback with f=0.021
Problem 6. A pipeline system from a water reservoir is designed for filling tank trucks as shown.
The 250mm line has an overall length of 30 m. The 150 mm line is 3m long discharging at A while
the one discharging at B is 15 m long. Use f=0.020 for all pipes.
a. Compute the discharge flowing through the 250 m diameter pipe
b. Compute the discharge flowing through the 150 mm diameter pipe at A.
c. Compute the discharge flowing through the 150 mm diameter pipe at B.
Sheet 4
Problem 7. Water is flowing at the rate of 300 liters/sec from A to E as shown in the figure.
Compute the flow in each pipe in lit/sec and the total head loss. Assume f=0.025 for all pipes.
Problem 8. With velocity of 1 m/s in the 20-mm pipe in the figure shown, calculate the flow through
the system and the head H required. Assume f=0.02 for all pipes and neglect minor losses.
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Pipe Data
Pipe Length, L (m) Diameter, D (mm)
1 300 200
2 300 300
3 300 500
4 600 300
5 800 300
Sheet 5 & 6
1. Discuss comprehensively the procedure in solving different types of reservoir problems.
Provide illustrations if necessary.
2. Provide 2 reservoir problems with solution based on the procedure you previously
discussed. You are free to choose what reservoir problem you want to include in this plate
(one for 3 reservoir problem, one for more than 3 reservoir problem)
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