Page 283 - Buried Pipe Design
P. 283
254 Chapter Five
Design External Load, lb/lin. ft
0 2,000 4,000 6,000 8,000 10,000
250 1,000
200 800
Class 200 600
Operating Pressure, lb/in 2 100 Class 100 Class 150 400 Design Pressure, lb/in 2
150
50 200
Bedding Conditions B 0 2.5 5 5 8 8 12 16 20 16 20 0
12
2.5
C
Depth of Cover, ft
Figure 5.3 Class pipe design curve for 12-in-diameter asbestos-cement pipe (see AWWA
C401 for other diameters). (Reprinted, by permission, from ANSI/AWWA C401-83, 12
American Water Works Association, 1986.)
H 5.0
4.37
B c 13.74/12
(from Fig. 2.6 with r sd P 0.5 and K 0.165, B d /B c 2.22)
13.74
B d (transition) (2.22) 2.54 ft
12
