Page 228 - Water Engineering Hydraulics, Distribution and Treatment

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Chapter 6
L (ft)
n
m
d
RA
RA
AB
18
5,000
B
C
8
BC
2,500
P
1,000
BE
6
2,500
CD
8
DE
6
1,000
4,000
10
AE
y
AD
d
5,000
AD
Figure 6.22 Water network for Problem 6.5.
(a) Determine the required diameter of main from water reservoir
6.6 Pressure gauge A x Water Distribution Systems: Components, Design, and Operation Pipe d (in.) 20,000
The layout of a water distribution system is shown in
Fig. 6.23. All pipes of the network are made of plastic (C = 150). to point A, if the minimum required pressure at point A is 60 psi.
The maximum flow in the system Q = 5,000 gpm. The following (b) Determine the required diameter of pipe AD, assuming that
data are given: the maximum allowable head loss in the network (ABCDE) is
3 ft/1,000 ft.
(c) Determine the required pipe diameter that is to be constructed
in parallel with BC assuming that the maximum allowable head
Pipe d (in.) L (ft)
loss in the network (ABCDE) is 3 ft/1,000 ft.
AB 14 1,000
BC 14 2,500 800 gpm
B
CD 14 500
650 gpm
DE 14 2,000 850
AE 10 3,000 Water R gpm C
AF 12 1,500 reservoir A E 1800 gpm
FE 10 2,500
D
400 gpm
Figure 6.24 Water network for Problem 6.8.
(a) Find the length of a single 16 in. diameter pipe that can replace
the system from A to E.
6.9 The layout of a water distribution system is shown in
Fig. 6.25. Elevation of water in reservoir = 600 m and elevation of
points A and C are 531 and 500 m, respectively. All pipes are made
B C of the same material with a Hazen–Williams coefficient C = 100.
The following data are given:
A D Pipe d (mm) L (m)
Q
Elevation RA d 6,000
1500 ft RA
AB 400 1,500
Q BC 200 750
E Elevation BE 150 300
F 1485 ft CD 300 750
DE 150 300
Figure 6.23 Water network for Problem 6.6.
AE 250 1,200
AD d AD 1,500
(b) Find the residual pressure at point E, if the available pressure
at point A is 60 psi. (a) Determine the required diameter of main from water reservoir
6.7 Check and reinforce (if required) sections d-d and e-e in to point A, if the minimum required pressure at point A is
Example 6.2. 450 kPa.
6.8 The layout of a water distribution system is shown in (b) Determine the required diameter of pipe AD, assuming that the
Fig. 6.24. Elevation of water in reservoir = 2,000 ft and elevation maximum allowable head loss in the network (ABCDE) is 3‰.
of point A = 1,770 ft. All pipes are made of the same material (c) Determine the required pipe diameter that is to be constructed
with a Hazen–Williams coefficient C = 100. The following data are in parallel with BC assuming that the maximum allowable head
given: loss in the network (ABCDE) is 3‰.