Page 45 - HVAC Pump Handbook

Rishel_CH03.qxd 20/4/06 5:35 PM Page 42

Piping System Friction
TABLE 3.5 Flow of Water in Steel Pipe (Continued )
2 ⁄2-in schedule 40, 3-in schedule 40, 4-in schedule 40,
1
ID 2.469 in ID 3.068 in ID 4.026 in
V
V
V
Flow, 2 Hf, 2 Hf, 2 Hf,
gal/min V, ft/s 2g, ft ft/100 ft V, ft/s 2g, ft ft/100 ft V, ft/s 2g, ft ft/100 ft
014 00.94 0.014 00.09
016 01.07 0.018 00.24
018 01.21 0.023 00.30
020 01.34 0.028 00.36 00.87 0.012 00.13 00.50 0.004 00.03
022 01.47 0.034 00.43 00.95 0.026 00.15 00.55 0.005 00.04
024 01.61 0.040 00.50 01.04 0.036 00.18 00.60 0.006 00.05
026 01.74 0.047 00.58 01.13 0.047 00.21 00.66 0.007 00.06
028 01.88 0.055 00.66 01.22 0.059 00.25 00.71 0.008 00.07
030 02.01 0.063 00.75 01.30 0.073 00.26 00.76 0.009 00.07
035 02.35 0.086 01.00 01.52 0.089 00.35 00.88 0.012 00.10
040 02.68 0.112 01.28 01.74 0.105 00.44 01.01 0.016 00.12
045 03.02 0.141 01.60 01.95 0.124 00.55 01.14 0.020 00.15
050 03.35 0.174 01.94 02.17 0.143 00.66 01.26 0.025 00.18
055 03.69 0.211 02.32 02.39 0.165 00.79 01.39 0.030 00.21
060 04.02 0.251 02.72 02.60 0.187 00.92 01.51 0.036 00.25
065 04.36 0.295 03.16 02.82 0.211 01.07 01.64 0.042 00.29
070 04.69 0.342 03.63 03.04 0.237 01.22 01.76 0.048 00.33
075 05.03 0.393 04.13 03.25 0.264 01.39 01.89 0.056 00.37
080 05.36 0.447 04.66 03.47 0.293 01.57 02.02 0.063 00.42
085 05.70 0.504 05.22 03.69 0.354 01.76 02.15 0.071 00.47
090 06.03 0.565 05.82 03.91 0.421 01.96 02.27 0.080 00.52
095 06.37 0.630 06.45 04.12 0.495 02.17 02.40 0.089 00.57
100 06.70 0.698 07.11 04.34 0.574 02.39 02.52 0.099 00.62
110 07.37 0.844 08.51 04.77 0.659 02.86 02.77 0.119 00.74
120 08.04 1.00 10.0 05.21 0.749 03.37 03.02 0.142 00.88
130 08.71 1.18 11.7 05.64 0.846 03.92 03.28 0.167 01.02
140 09.38 1.37 13.5 06.08 0.948 04.51 03.53 0.193 01.17
150 10.05 1.57 15.4 06.51 1.06 05.14 03.78 0.222 01.32
160 10.7 1.79 17.4 06.94 1.17 05.81 04.03 0.253 01.49
170 11.4 2.02 19.6 07.38 1.42 06.53 04.28 0.285 01.67
180 12.1 2.26 21.9 07.81 1.69 07.28 04.54 0.320 01.86
190 12.7 2.52 24.2 08.25 1.98 08.07 04.79 0.356 02.06
200 13.4 2.79 26.7 08.68 2.29 08.90 05.04 0.395 02.27
220 14.7 3.38 32.2 09.55 2.63 10.7 05.54 0.478 02.72
240 16.1 4.02 38.1 10.4 3.00 12.6 06.05 0.569 03.21
260 17.4 4.72 44.5 11.3 3.38 14.7 06.55 0.667 03.74
280 18.8 5.47 51.3 12.2 3.79 16.9 07.06 0.774 04.30
300 20.1 6.28 58.5 13.0 4.23 19.2 07.56 0.888 04.89
320 13.9 4.68 22.0 08.06 1.01 05.51
340 14.8 24.8 08.57 1.14 06.19
360 15.6 27.7 09.07 1.28 06.92
380 16.5 30.7 09.58 1.43 07.68
400 17.4 33.9 10.1 1.58 08.47
420 10.6 1.74 09.30
440 11.1 1.91 10.2
460 11.6 2.09 11.1
480 12.1 2.27 12.0
500 12.6 2.47 13.0
550 13.9 2.99 15.7
600 15.1 3.55 18.6
650 16.4 4.17 21.7
700 17.6 4.84 25.0
NOTE: V velocity, feet per second; V /2g velocity head, feet; Hf friction loss, feet
2
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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