Page 44 - HVAC Pump Handbook

Rishel_CH03.qxd 20/4/06 5:35 PM Page 41

Piping System Friction
Piping System Friction 41

TABLE 3.5 Flow of Water in Steel Pipe
1 1
1 ⁄ 4 -in schedule 40, 1 ⁄ 2 -in schedule 20, 2-in schedule 40,
ID 1.380 in ID 1.610 in ID 2.067 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
003 00.64 0.006 000.21
004 00.86 0.011 000.34
005 01.07 0.018 000.51 00.79 0.010 00.242
006 01.29 0.026 000.71 00.95 0.014 00.333 00.57 0.005 00.10
007 01.50 0.035 000.93 01.10 0.019 00.439 00.67 0.007 00.13
008 01.72 0.046 001.18 01.26 0.025 00.558 00.77 0.009 00.17
009 01.93 0.058 001.46 01.42 0.031 00.689 00.86 0.012 00.21
010 02.15 0.072 001.77 01.58 0.039 00.829 00.96 0.014 00.25
012 02.57 0.103 002.48 01.89 0.056 01.16 01.15 0.021 00.34
014 03.00 0.140 003.28 02.21 0.076 01.53 01.34 0.028 00.45
016 03.43 0.183 004.20 02.52 0.099 01.96 01.53 0.036 00.58
018 03.86 0.232 005.22 02.84 0.125 02.42 01.72 0.046 00.72
020 04.29 0.286 006.34 03.15 0.154 02.94 01.91 0.057 00.87
022 04.72 0.346 007.58 03.47 0.187 03.52 02.10 0.069 01.03
024 05.15 0.412 008.92 03.78 0.222 04.14 02.29 0.082 01.20
026 05.58 0.483 010.37 04.10 0.261 04.81 02.49 0.096 01.39
028 06.01 0.561 011.9 04.41 0.303 05.51 02.68 0.111 01.60
030 06.44 0.644 013.6 04.73 0.347 06.26 02.87 0.128 01.82
035 07.51 0.877 018.5 05.52 0.472 08.52 03.35 0.174 02.42
040 08.58 1.14 023.5 06.30 0.618 10.79 03.82 0.227 03.10
045 09.65 1.44 029.7 07.09 0.782 13.7 04.30 0.288 03.85
050 10.7 1.79 036.0 07.88 0.965 16.4 04.78 0.355 04.67
055 11.8 2.16 043.2 08.67 1.17 19.7 05.26 0.430 05.59
060 12.9 2.57 051.0 09.46 1.39 23.2 05.74 0.511 06.59
065 13.9 3.02 059.6 10.24 1.63 27.1 06.21 0.600 07.69
070 15.0 3.50 068.8 11.03 1.89 31.3 06.69 0.696 08.86
075 16.1 4.02 078.7 11.8 2.17 35.8 07.17 0.799 10.1
080 17.2 4.58 089.2 12.6 2.47 40.5 07.65 0.909 11.4
085 18.2 5.17 100.2 13.4 2.79 45.6 08.13 1.03 12.8
090 19.3 5.79 112.0 14.2 3.13 51.0 08.60 1.15 14.2
095 15.0 3.48 56.5 09.08 1.28 15.8
100 15.8 3.86 62.2 09.56 1.42 17.4
120 11.5 2.05 24.7
140 13.4 2.78 33.2
160 15.3 3.64 43.0
180 17.2 4.60 54.1
200 19.1 5.68 66.3

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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