How Cathodic Protection Inspection Can Save Your Tank
A galvanic cathodic protection system for underground storage tanks involves sacrificial anodes attached to the tank during manufacturing, along with wiring for an inspection station installed near the ground’s surface. These systems have a limited lifespan, during which the sacrificial anode deteriorates to protect the tank or piping. Regular cathodic protection inspection is essential to determine when the anodes are no longer effective. Once they can no longer provide protection, the system begins to fail and corrosion can occur.
Impressed Current Cathodic Systems
The impressed current cathodic protection system typically offers a much longer lifespan for the electrodes compared to a galvanic anode. These systems include a rectifier that converts alternating current (AC) into direct current (DC), which is properly calibrated to deliver the necessary protection. Since the power for the electrodes is provided by the external power source rather than being generated through electrode degradation, the power supply can be adjusted to deliver additional power as needed, as long as the electrodes remain functional.
Checklist for Impressed Current Cathodic Protection Systems
You need to have a periodic test conducted by a third-party inspector to make sure your cathodic protection system is adequately protecting your UST system.
This test needs to be conducted:
- At least every 1 year after the previous test.
- Within 60 days after any repairs to your UST system.
- Keep the results of at least the last two tests on file.
- Inspect your rectifier and record the readings at least every 60 days to make sure that it is operating within normal limits.
- Keep records of the operating life of the facility.
- Never turn off your rectifier!
What Cathodic Protection Does
Cathodic protection is an electrical technique for preventing corrosion. It protects underground tanks and lines by utilizing the natural energy found in metallic substances. In layman’s terms, anodes—metal components buried near tanks—are wired together and rich in natural energy. This energy drives electrical current through the soil, wire, and buried metal.
The anodes dissolve over time, shielding steel tanks or pipelines from corrosion. There are two types of systems: impressed current and sacrificial anode. Regular corrosion control assessments help ensure these systems function properly. To explore this further, read about the role of corrosion monitoring in water tank maintenance.
Three Tips for Maintaining Your Cathodic Protection System and Extending its Working Life
1. Are you having regular inspections?
Regular testing and inspection are advised to ensure that your system is in good working order. Establishing a monitoring and logging system can also aid in corrosion prevention efforts.
Cathodic protection inspection should be part of your scheduled maintenance plan to stay compliant with current Federal regulations. These rules require testing by a qualified cathodic protection tester within six months of installation and every three years afterward.
However, if you wait three years to test the system, the damage that may occur to steel tanks and lines can be extensive if the protection system has failed. To strengthen your maintenance strategy, it’s also essential to monitor related components—learn why regular inspection of tank appurtenances is critical for water tank safety.
2. Is your cathodic protection system providing the correct amount of protection against corrosion?
In impressed current protection systems, a rectifier control box will be located close to the tank monitor. In the rectifier box is always a voltmeter, but an ampmeter with a green/red indicator light is optional. These meters and indicators lights indicate only that there is power, not if it is enough. If the indicator light on your system is red, you will not have corrosion protection. Contact a cathodic protection specialist right away.
3. Is wiring exposed to the system?
Check for broken or disconnected cables around the tank. These wires most likely are part of the cathodic system. A broken wire can cause the system to malfunction and indicate that it is not protecting against corrosion. To determine if the wires are a part of your cathodic system, contact a cathodic professional. Repairs will be needed if the exposed wires form part of the system. Keep in mind that digging around the tank area could easily disable the system. You should consult your cathodic specialist if you have any questions.
Does Your Underground Tank need a cathodic Protection Inspection?
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