Helwan University B.Sc.
Students
Mataria Faculty of Engineering Course: Pumps
Mechanical Power Department Sheet No.1 (1)
(1) For the pump installations shown in Fig.(A), (B),and (c) find the pump specifications
(Estimate the capacity Q [m3/h ] , pump head H [m] and brake power P [kW]).
4" Steel pipe Sch.40
Total length = 80 m
4" Gate 3.0 bar 10.0 m
Valve
0.0 m 6" Gate Nozzle
Valve pump ID = 50 mm
Cd= 1.0
Motor
Water
@ 20 C
Reservoir
Fig.(A)
6" Strainer 6" Steel pipe Sch.40
Total length = 20 m
55.0 m
for water @ 20C
r = 1000 kg/m3
m = .001 kg/m/s
Pv = 0.024 bar (abs.)
Two Nozzles
ID = 32 mm
Cd= 1.0
25.0 m
Fig.(B)
3" Steel pipe Sch.40
Total length = 20 m
6" Steel pipe Sch.40
Total length = 40 m
6" Gate
Valve
0.0 m 6" Gate pump
Valve
Motor
Water
@ 20 C
Reservoir
6" Strainer 6" Steel pipe Sch.40
Total length = 15 m
Helwan University B.Sc. Students
Mataria Faculty of Engineering Course: Pumps
Mechanical Power Department Sheet No.1 (2)
31.5 m
2.5 bar 30.0 m
25 m Air
4" Steel piping Sch.40 Fig.(C)
Total length = 100 m
Water
@ 20 C
4" Gate Valve
measured mean 4" Check Valve
velocity v=2 m/s
4" Gate Valve
-0.2 bar pump
Motor
0.0 m Air
4" Steel piping Sch.40
Water Total length = 20 m
@ 20 C
(2) Fig (2) shows a submersible turbine 6" Gate 6" Check
6" Discharge Valve Valve
pump installed in a deep well. The pump Pipe, steel 6" Discharge
delivers water at 20 C into an irrigation Sch. 40 Elbow
network. The Static elevation of the
50 cm
0.0 m
water surface in the well is -65 m and Ground Level
the expected draw down is 20 m. If the
network requirements are a capacity of 6" Discharge
Column, St -65.0 m
150 m3/h and a pressure of 5.0 bars at Sch.40
the beginning of the network - just after L= 95 m Static
the 6" gate valve - estimate the required water level
pump head and brake power if the pump -85.0 m
efficiency is 75%. 10" Well Dynamic
Casing water level
(3) Specify the pump needed to let the
public water reaches the highest floor of
a high building. The building comprises 8" Pump
12 floors and each floor comprises 4 Bowls
flats. The distance between floors is 3.5 -100 m
m. The average residents in the building 6" Strainer
Pump
is 4 persons per flat. The average daily suction level
water consumption of each person is 350
8" Submersible
liter/day. The public water comes to the Motor
pump inlet with a pressure 1.5 bar. The
pump delivers the water into 2" pipe,
galvanized iron, ID=52.5 mm, length=65
m. The pipe feeds the flats with public
Fig (2)
water. Assume any missing data.
Helwan University B.Sc. Students
Mataria Faculty of Engineering Course: Pumps
Mechanical Power Department Sheet No.1 (3)
(4) For the pump installation shown in Fig.(4), estimate the pump head and
the consumed power , if the pump circulates 70 kg/s of water between the
two heat exchangers and the pump is 75% efficient. How much will be the
pressure gage reading at the pump inlet point (1) while the pump is
operating?
Fig (4)
Pump Installation Layout
All pipe are steel Sch.40
Fittings diameters are same as connected pipes.
Length of Ø6" pipe from pump Disch. to Exch.(1) inlet = 75 m
Length of Ø6" pipe from Exch.(1) exit to Exch.(2) inlet = 125 m
Length of Ø8" pipe from Exch.(2) exit to pump suction = 100 m
3 K=12.6
reference inlet Velocity
2.0 m
Ø6" Exchanger (1) Ø6"
Inlet Temp. =20 C,
Outlet Temp.=80 C
Ø6"
Ø6"
2 x Ø6"
2 x Ø6" Elbow
Elbow
2 0.5 m
Pump Ø408
0.0 m
Ø6"
1
Ø8"
4 K=14.2
reference inlet Velocity
-4.0 m
Ø8" Exchanger (2) Ø6"
Inlet Temp. =80 C,
Outlet Temp.=20 C
2 x Ø8" Elbow
