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24.1.2 Types of Cathodic Protection (CP) Based on the type of the polarization used to protect the structure, CP systems are divided into sacrificial anode or impressed current systems | Khác | |
24.1.2.1 Sacrificial Anode Cathodic Protection | Khác | |
1. The potential between the anode and the corrod- ing structure must be large to overcome the for- mation of anode cathode cells on the corroding structure | Khác | |
2. When drawing current, the anode should not be polarized to a large extent | Khác | |
24.1.3 Selection of CPsWhen selecting the type of cathodic protection sys- tem, the designer should consider the size of the structure to be protected and past project experience in operating and maintaining both types of systems | Khác | |
24.1.3.1 Basis for Selecting a Sacrificial Anode SystemAdvantages | Khác | |
1. External power source is not required 2. Installation is less complex | Khác | |
3. Uniform distribution of current 4. Minimum maintenance | Khác | |
5. Minimum cathodic interference Limitations | Khác | |
1. Current output is limited. It has limited driving potential, therefore the protection for the bare steel area is limited for each anode | Khác | |
2. Poorly coated structures need more anodes 3. Ineffectiveness in high resistive environments 24.1.3.2 Basis for Selecting an ImpressedCurrent System Advantages | Khác | |
1. Applicable for wider range of voltage and current requirements | Khác | |
2. High current can be impressed with a single ground bed | Khác | |
3. Single installation can protect larger surface of the metallic structure | Khác | |
4. Uncoated and poorly coated structures can be ef- fectively protected | Khác | |
5. Voltage and current can be varied to meet the pipeline changing conditions with timeLimitations | Khác | |
1. Overprotection leads to coating damage and hy- drogen embrittlement | Khác | |
2. The system is affected by interference problems 3. External power is necessary, thus the system isvulnerable to power failure | Khác |
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