Collection of Suggested Problems

Rule of thumb:
1. Everything we covered over the past weeks (see slides) are important
for the exam
2. You should solve all problems and examples solved and/or discussed in
the class
3. Solve the quizzes and assignments (all sets, if applicable): I have

uploaded the assignments and quizzes with solutions for you.
4. Additionally what we have discussed during the review class are also
very important.
5. There will be conceptual questions based on the text we have worked

on during class activity and my lecture
6. Charts, tables, conversions and required formula will be provided

8.30 A 3-in Schedule 40 steel pipe is 5000 ft long and carries a lubricating
oil between two points A and B such that the Reynolds number is 800.
Point B is 20 ft higher than A. The oil has a specific gravity of 0.90 and a
dynamic viscosity of 4 × 10−4 lb-s/ft2. If the pressure at A is 50 psig,
calculate the pressure at B.
8.31 Benzene at 60°C is flowing in a DN 25 Schedule 80 steel pipe at the

rate of 20 L/min. The specific weight of the benzene is 8.62 kN/m3.
Calculate the pressure difference between two points 100 m apart if the
pipe is horizontal.
8.33 Water at 80°F flows from a storage tank through 550 ft of 6-in
Schedule 40 steel pipe, as shown in Fig. 8.11. Taking the energy loss due
to friction into account, calculate the required head h above the pipe inlet
to produce a volume flow rate of 2.50 ft3/s.
NB: questions posted here are just for your idea about the final exam, they
do not ensure that questions will be entirely based on these examples!
8.33 Water at 80°F flows from a storage tank through 550 ft of 6-in
Schedule 40 steel pipe, as shown in Figure below. Taking the energy loss
due to friction into account, calculate the required head h above the pipe
inlet to produce a volume flow rate of 2.50 ft3/s.
8.36 A submersible deep-well pump delivers 745 gal/h of water at 60°F
through a 1-in Schedule 40 steel pipe when operating in the system
shown in below figure. If the total length of pipe is 140 ft, calculate the
power delivered by the pump to the water.
8.42 For the system shown in Fig. 8.17, compute the power delivered by the
pump to the water to pump 50 gal/min of water at 60°F to the tank. The air in
the tank is at 40 psig.
8.46 Water at 60°F is being pumped from a stream to a reservoir whose surface
is 210 ft above the pump. See Fig. 8.19. The pipe from the pump to the reservoir
is an 8-in Schedule 40 steel pipe, 2500 ft long. If 4.00 ft3/s is being pumped,
compute the pressure at the outlet of the pump. Consider the friction loss in the
discharge line, but neglect other losses.
10.40 A piping system for supplying heavy fuel oil at 25°C is arranged as shown
in Fig. 10.35. The bottom leg of the tee is normally capped, but the cap can be
removed to clean the pipe. Compute the energy loss as 0.08 m3/s flows through
the tee.
11.1 Water at 10°C flows from a large reservoir at the rate of 1.5 × 10-2 m3/s
through the system shown in Fig. 11.13. Calculate the pressure at B.
11.3 Figure 11.15 shows a portion of a hydraulic circuit. The pressure at point B
must be 200 psig when the volume flow rate is 60 gal/min. The hydraulic fluid
has a specific gravity of 0.90 and a dynamic viscosity of 6.0 × 10-5 lb·s/ft2. The
total length of pipe between A and B is 50 ft. The elbows are standard. Calculate
the pressure at the outlet of the pump at A.
13.12 Describe the general shape of the plot of pump capacity versus discharge
pressure for a positive-displacement rotary pump.
13.19 For a given size of centrifugal pump casing, if the diameter of the impeller
is reduced by 25 percent, how much does the capacity change?
is reduced by 25 percent, how much does the total head capability change?
is reduced by 25 percent, how much does the power required to drive the pump
change?
13.25 For the 2 × 3 - 10 centrifugal pump performance curve
shown in Fig. 13.28, describe the performance that can be
expected from a pump with an 8-in impeller operating against a
system head of 200 ft. Give the expected capacity, the power
required, the efficiency, and the required NPSH.
13.26 For the 2 × 3 - 10 centrifugal pump performance curve

shown in Fig. 13.28, at what head will the pump having an 8-in
impeller operate at its highest efficiency? List the pump’s
capacity, power required, efficiency, and the required NPSH at
that head.
13.27 Using the result from Problem 13.26, describe how the
performance of the pump changes if the system head increases
by 15 percent.
NB: questions posted here are just

for your idea about the final exam,
they do not ensure that questions
will be entirely based on these
examples!
13.35 For the 1½ × 3 - 13 centrifugal pump performance curve shown in Fig. 13.34, determine
the capacity that can be expected from a pump with a 12-in impeller operating against a
system head of 550 ft. Then, compute the specific speed and specific diameter and locate the
corresponding point on Fig. 13.53.

examples!
13.43 Define net positive suction head (NPSH).
13.44 Distinguish between NPSH available and NPSH required.
13.45 Describe what happens to the vapor pressure of water as the temperature increases.
13.55 Determine the available NPSH for the system shown in Fig. 13.38(b). The fluid is water
at 80°C and the atmospheric pressure is 101.8 kPa. The water level in the tank is 2.0 m below
the pump inlet. The vertical leg of the suction line is a DN 80 Schedule 40 steel pipe, whereas
the horizontal leg is a DN 50 Schedule 40 pipe, 1.5 m long. The elbow is of the long-radius
type. Neglect the loss in the reducer. The foot valve and strainer are of the hinged-disk type.
The flow rate is 300 L/min.

examples!

Collection of Suggested Problems

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Collection of Suggested Problems

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Rule of thumb:

3. Solve the quizzes and assignments (all sets, if applicable): I have

5. There will be conceptual questions based on the text we have worked

6. Charts, tables, conversions and required formula will be provided

8.31 Benzene at 60°C is flowing in a DN 25 Schedule 80 steel pipe at the

13.26 For the 2 × 3 - 10 centrifugal pump performance curve

NB: questions posted here are just

NB: questions posted here are just

NB: questions posted here are just

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