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Table of friction lost

Technical specifications

This table shows the friction loss in water hose in pounds per square inch per 100 foot length, for straight, smooth bore hose.

Note: Friction loss can vary by up to 20% due to temperature. Bends can increase friction loss by 50%.

Table 1 – 1/2" through 2 1/2" ID Hose - Table 2 - 3" through 12" ID Hose

Flow of
Water
in GPM
 Actual Inside Diameter in Inches
 1/2" 3/4" 1" 1 1/4" 1 1/2" 2 2 1/2"
1 1.41 - - - - - -
2 5.09 0.71 - - - - -
5 27.7 3.85 0.95 0.32 0.13 - -
10 100 13.9 3.42 1.15 0.47 0.12 -
15 - 29.4 7.24 2.44 1.00 0.25 0.08
20 - 50.0 12.3 4.16 1.71 0.42 0.14
25 - 75.6 18.6 6.28 2.59 0.64 0.21
30 - 106 26.1 8.80 3.62 0.89 0.3
35 - 141 34.7 11.7 4.82 1.19 0.4
40 - - 44.4 15.0 6.17 1.52 0.51
45 - - 55.3 18.6 7.67 1.89 0.64
50 - - 67.1 22.7 9.32 2.3 0.77
60 - - 94.1 31.7 13.1 3.22 1.09
70 - - 125 42.2 17.4 4.28 1.44
80 - - - 54.0 22.2 5.48 1.85
90 - - - 67.2 27.7 6.81 2.3
100 - - - 81.7 33.6 8.28 2.79
125 - - - 123 50.8 12.5 4.22
150 - - - - 71.1 17.5 5.91
175 - - - - 94.6 23.3 7.86
200 - - - - 121 29.8 10.1
225 - - - - - 37.1 12.5
250 - - - - - 45.1 15.2
275 - - - - - 53.8 18.1
300 - - - - - 63.2 21.3
350 - - - - - 84 28.3
400 - - - - - 108 36.3
450 - - - - - - 45.1
500 - - - - - - 54.8
600 - - - - - - 76.8
700 - - - - - - 102
800 - - - - - - 131
1000 - - - - - - -

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