Corrosion Monitoring System
1. Monitoring: -
Routine monitoring is recommended for all Cathodic Protection installations. The purpose of monitoring is to ensure the system is operating efficiently.
Monitoring is comprised of both a visual inspection and electrical testing.
The general monitoring schedule will be: -
Activity |
Time Period |
|---|---|
| Transformer rectifier | Twice in a month/owner requirement |
| Junction boxes | Once in a month/owner requirement |
| Structure to soil potential measurement. | Once in a month/owner requirement |
| Instant OFF potentialmeasurement through Interrupting the current. | Quarterly/owner requirement |
| Close interval potential logging/survey | Once in 3 years/Owner requirement |
| Current attenuation test | Once in 3 years/Owner requirement |
| Direct current voltage gradient | Once in 3 years/Owner requirement |
2. Maintenance: -
The major causes of Cathodic Protection failure are due to negligence in effective maintenance. Maintenance for Cathodic Protection systems include the following: -- Clean and tighten all bolted current – carrying connections.
- Checking the indicating meters for accuracy.
- Replace damaged and faulty spare parts.
- Cleaning and Lubricating of Screws and terminals of the junction boxes and covers, and Repair any broken test post and reposition if necessary.
- Record the readings for all test points along the pipeline.
- Adjust the rectifier output according to the required protection level value.