Nace CP 1 - Steel Pipe Resistance; Table of Pipe Resistances

Field Measurements 5:19
CP 1 – Cathodic Protection Tester Course Manual
© NACE International, 2000
02/01/05
Table 5.3 Table of Pipe Resistances
Steel Pipe Resistance*
(A)(B)
Pipe
Size
Outside
Diameter
Wall Thickness Weight Resistance
in. in. Cm in. cm lb / ft kg / m
µohms/ft µohms/m
2 2.35 5.97 0.154 0.39 3.65 5.43 76.2 256.84
4 4.5 11.43 0.237 0.60 10.8 16.07 26.8 87.93
6 6.62 16.81 0.280 0.71 16.0 28.28 15.2 46.87
8 8.62 21.89 0.322 0.82 28.6 42.56 10.1 33.14
10 10.75 27.31 0.365 0.93 40.5 60.27 7.13 23.39
12 12.75 32.38 0.375 0.95 46.6 73.81 5.82 16.09
14 14.00 35.56 0.375 0.95 54.6 81.26 5.29 17.36
16 16.00 40.64 0.375 0.95 62.6 93.16 4.61 15.12
18 18.00 45.72 0.375 0.95 70.6 105.07 4.09 13.42
20 20.00 50.80 0.375 0.95 78.6 116.97 3.68 12.07
22 22.00 55.88 0.375 0.95 86.6 128.88 3.34 10.96
24 24.00 60.96 0.375 0.95 94.6 140.78 3.06 10.04
26 26.00 66.04 0.375 0.95 102.6 152.69 2.82 6.25
28 28.00 71.12 0.375 0.95 110.6 164.59 2.62 8.60
30 30.00 76.20 0.375 0.95 118.7 176.65 2.44 8.01
32 32.00 81.28 0.375 0.95 126.6 188.41 2.28 7.48
34 34.00 86.36 0.375 0.95 134.6 200.31 2.15 7.05
36 36.00 91.44 0.375 0.95 142.6 212.22 2.03 6.66
*Conversions: 1 in. = 2.54 cm
1 ft = 0.3048 m
(A)
Based on steel density of 489 lbs/ft
3
(7832 kg/m
3
) and steel
resistivity of 18 microhm-cm.
(B)
R = 16.061 x resistivity in microhm-cm = Resistance of 1 ft of
Weight per foot pipe, microhms