Page 49 - HVAC Pump Handbook

Rishel_CH03.qxd 20/4/06 5:35 PM Page 46

Piping System Friction
TABLE 3.5 Flow of Water in Steel Pipe (Continued )
24-in schedule 40, 30-in schedule 20, 36-in inside
ID 22.624 in ID 29.000 in diameter
Flow, 2 Hf, 2 Hf, 2 Hf,
V
V
V
gal/min V, ft/s 2 g, ft ft/100 ft V, ft/s 2 g, ft ft/100 ft V, ft/s 2 g, ft ft/100 ft
00300 00.24 0.001 0.001
00400 00.32 0.002 0.002 00.19 0.001 0.001
00500 00.40 0.002 0.003 00.24 0.001 0.001
00600 00.48 0.004 0.004 00.29 0.001 0.001
00700 00.56 0.005 0.005 00.34 0.002 0.001
00800 00.64 0.006 0.006 00.39 0.002 0.002
00900 00.72 0.008 0.008 00.44 0.003 0.002
01000 00.80 0.010 0.009 00.49 0.004 0.003 00.32 0.002 0.001
01200 00.96 0.014 0.013 00.58 0.005 0.004 00.38 0.002 0.001
01400 01.12 0.019 0.017 00.68 0.007 0.005 00.44 0.003 0.002
01600 01.28 0.025 0.022 00.78 0.009 0.007 00.50 0.004 0.002
01800 01.44 0.032 0.027 00.87 0.012 0.008 00.57 0.005 0.003
02000 01.60 0.040 0.033 00.97 0.015 0.010 00.63 0.006 0.003
02500 01.99 0.062 0.050 01.21 0.023 0.015 00.79 0.010 0.005
03000 02.39 0.089 0.070 01.46 0.033 0.021 00.95 0.014 0.007
03500 02.79 0.121 0.093 01.70 0.045 0.028 01.10 0.019 0.010
04000 03.19 0.158 0.120 01.94 0.059 0.035 01.26 0.025 0.012
04500 03.59 0.200 0.149 02.19 0.074 0.044 01.41 0.031 0.015
05000 03.99 0.247 0.181 02.43 0.092 0.054 01.58 0.039 0.019
06000 04.79 0.356 0.257 02.91 0.132 0.075 01.89 0.056 0.026
07000 05.59 0.485 0.343 03.40 0.180 0.100 02.21 0.076 0.035
08000 06.38 0.633 0.441 03.89 0.235 0.129 02.52 0.099 0.044
09000 07.18 0.801 0.551 04.37 0.297 0.161 02.84 0.125 0.055
10000 07.98 0.989 0.671 04.86 0.367 0.196 03.15 0.154 0.067
12000 09.58 1.42 0.959 05.83 0.528 0.277 03.78 0.222 0.094
14000 11.2 1.94 1.29 06.80 0.719 0.371 04.41 0.303 0.126
16000 12.8 2.53 1.67 07.77 0.939 0.478 05.04 0.395 0.162
18000 14.4 3.21 2.10 08.74 1.19 0.598 05.67 0.500 0.203
20000 16.0 3.96 2.58 09.71 1.47 0.732 06.30 0.618 0.248
22000 17.6 4.79 3.10 10.7 1.78 0.886 06.93 0.746 0.300
24000 19.2 5.70 3.67 11.7 2.12 1.05 07.56 0.888 0.357
26000 20.7 6.69 4.29 12.6 2.48 1.24 08.20 1.04 0.419
28000 13.6 2.88 1.43 08.83 1.21 0.486
30000 14.6 3.30 1.61 09.46 1.39 0.540
35000 17.0 4.49 2.17 11.03 1.89 0.724
40000 19.4 5.87 2.83 12.6 2.47 0.941
45000 21.9 7.42 3.56 14.1 3.13 1.18
50000 24.3 9.17 4.38 15.8 3.86 1.45
55000 17.4 4.70 1.75
60000 18.9 5.56 2.07
70000 22.1 7.56 2.81

2
NOTE: V velocity, feet per second; V /2g velocity head, feet; Hf friction loss, feet
per 100 feet of pipe. No aging factor, manufacturer’s tolerance, or any factor of safety
has been included in the friction losses Hf.

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