The below table shows friction loss over 30 metres (or 100 feet) of Buteline PB-1 pipe:


Pressure / Head Loss Per 30 Metres (100 Feet) of Pipe
Minimum Flow Required Type 10 Type 18 Type 22 Type 28
L/min Gallons/min kPa Bar kPa Bar kPa Bar kPa Bar
0.5 0.11 3.63 0.036 0.20 0.002 0.04 0.000 0.01 0.000
1 0.22 13.11 0.131  0.72 0.007 0.15 0.001 0.05 0.000
2 0.44 47.18 0.472  2.59 0.026 0.53 0.005 0.17 0.002
3 0.67 100.00 1.000  5.50 0.055 1.12 0.011 0.36 0.004
4 0.89 170.38 1.704  9.37 0.094 1.91 0.019 0.62 0.006
5 1.11 257.28 2.573  14.14 0.141 2.89 0.029 0.93 0.009
10 2.22 - - 51.00 0.510 10.41 0.104 3.36 0.034
12 2.67 - - 71.46 0.715 14.59 0.146 4.71 0.047
14 3.11 - - 95.04 0.950 19.40 0.194 6.26 0.063
16 3.56 - - 121.67 1.217 24.84 0.248 8.02 0.080
18 4.00 - - 151.29 1.513 30.88 0.309 9.97 0.100
20 4.44 - - 183.86 1.839 37.53 0.375 12.11 0.121
25 5.56 - - 277.82 2.778 56.71 0.567 18.30 0.183
30 6.67 - - 389.27 3.893 79.46 0.795 25.65 0.256
35 7.78 - - 517.73 5.177 105.68 1.057 34.11 0.341
40 8.89 - - 662.82 6.628 135.29 1.353 43.67 0.437
45 10.00 - - 824.19 8.242 168.23 1.682 54.30 0.543

NOTE: Type 16 PB-1 pipe and Type 18 PB-1 pipe are equivalents.