| 5. Cathodic Protection | |
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5.12 Comparison of Galvanic Anode and Impressed Current Systems |
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A comparison of galvanic anode and impressed current cathodic protection system is given below:
| Advantages | Disadvantages | |
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Galvanic Anode Systems |
Requires no external power source | Fixed driving voltage |
| Easy installation | Limited current output | |
| Less expensive | Requires more frequent replacement of anodes | |
| Ease of maintenance | - | |
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Impressed Current Systems |
Uses external power source. Rectifiers provide the current needed for cathodic protection. | Cannot be installed in areas without power. |
| Current may be varied | Installation of the impressed current system is complex. | |
| Suits any changes in the system | It is more expensive than sacrificial system. | |
| Designed for longer life and no restrictions on the length of structure to be protected. | Frequent maintenance is needed. |
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