Bare Pipe Chart
| Soil Resistivity in ohm-cm | 1K | 2K | 3K | 4K | 5K | 6K | 7K | 8K | 9K | 10K | |||
| Anode Recommendation | 48# | 48# | 32# | 17# | 17# | 9# | 9# | 9# | 9# | 9# | |||
| Nominal Output in milliamperes | 208 | 104 | 55 | 40 | 33 | 20 | 17 | 15 | 14 | 12 | |||
| Nominal Life in years | 11 | 22 | 28 | 20 | 25 | 22 | 25 | 29 | 32 | 36 | |||
Pipe inch | O.D. inch | Surface Area Ft2/L.F. | Current Reqmt. mA/L.F. | Nominal Anode Spacing in feet | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 | 2.275 | 0.60 | 1.19 | 175 | 87 | 46 | 34 | 28 | 17 | 14 | 13 | 12 | 10 |
| 4 | 4.50 | 1.18 | 2.36 | 88 | 44 | 23 | 17 | 14 | 8 | 7 | 6 | 6 | 5 |
| 6 | 6.625 | 1.73 | 3.47 | 60 | 30 | 16 | 12 | 10 | 6 | 5 | 4 | 4 | 3 |
| 8 | 8.625 | 2.26 | 4.51 | 46 | 23 | 12 | 9 | 7 | 4 | 4 | 3 | 3 | 3 |
| 10 | 10.75 | 2.81 | 5.63 | 37 | 18 | 10 | 7 | 6 | 4 | 3 | 3 | 2 | 2 |
| 12 | 12.75 | 3.34 | 6.67 | 31 | 16 | 8 | 6 | 5 | 3 | 3 | 2 | 2 | 2 |
| 14 | 14.00 | 3.66 | 7.33 | 28 | 14 | 8 | 5 | 5 | 3 | 2 | 2 | 2 | 2 |
| 16 | 16.00 | 4.19 | 8.37 | 25 | 12 | 7 | 5 | 4 | 2 | 2 | 2 | 2 | 1 |
| 18 | 18.00 | 4.71 | 9.42 | 22 | 11 | 6 | 4 | 4 | 2 | 2 | 2 | 1 | 1 |
| 20 | 20.00 | 5.23 | 10.47 | 20 | 10 | 5 | 4 | 3 | 2 | 2 | 1 | 1 | 1 |
| 22 | 22.00 | 5.76 | 11.51 | 18 | 9 | 5 | 3 | 3 | 2 | 1 | 1 | 1 | 1 |
| 24 | 24.00 | 6.28 | 12.56 | 17 | 8 | 4 | 3 | 3 | 2 | 1 | 1 | 1 | 1 |
| 26 | 26.00 | 6.80 | 13.61 | 15 | 8 | 4 | 3 | 2 | 1 | 1 | 1 | 1 | 1 |
| 28 | 28.00 | 7.33 | 14.65 | 14 | 7 | 4 | 3 | 2 | 1 | 1 | 1 | 1 | 1 |
| 30 | 30.00 | 7.85 | 15.70 | 13 | 7 | 4 | 3 | 2 | 1 | 1 | 1 | 1 | 1 |
| 32 | 32.00 | 8.37 | 16.75 | 12 | 6 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | 1 |
| 34 | 34.00 | 8.90 | 17.79 | 12 | 6 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | 1 |
| 36 | 36.00 | 9.42 | 18.84 | 11 | 6 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | 1 |
Calculated values based on current density of 2 milliamperes per square foot.
