Page 215 - Buried Pipe Design
P. 215
Design of Pressure Pipes 189
700 1600
Velocity of
Pressure Wave
5000 ft/s
600 1400
1200
500 4500 ft/s 4000
Pressure Rise P (lb/in 2 ) 400 3500 2500 1000 Rise in Head H (ft of water)
3000
800
300
2000 600
200 1550
1340 400
100 1000
1200 200
1470
2 4 6 8 10
Fluid Velocity Change V (ft/s)
Figure 4.3 Water hammer surge calculation.
TABLE 4.1 Water Hammer Wave Speed for Ductile Iron Pipe, ft/s
Class
Size 50 51 52 53 54 55 56
4 — 4409 4452 4488 4518 4544 4567
6 4206 4265 5315 4358 4394 4426 4454
8 4085 4148 4202 4248 4289 4324 4356
10 3996 4059 4114 4162 4205 4242 4276
12 3919 3982 4038 4087 4130 4169 4205
14 3859 3921 3976 4024 4069 4108 4144
16 3783 3846 3902 3952 3998 4039 4076
18 3716 3779 3853 3887 3933 4038 4014
20 3655 3718 3776 3827 3874 3917 3957
24 3550 3614 3671 3723 3771 3815 3855
30 3387 3472 3547 3615 3676 3731 3782
36 3311 3409 3495 3571 3638 3700 3755
42 3255 3362 3456 3539 3612 3678 3737
48 3207 3323 3424 3512 3590 3659 3721
54 3201 3320 3423 3512 3591 3599 3724
