The galvanic cathodic protection system of an underground storage tank includes the incorporation of sacrificial anodes onto the tank during its fabrication, as well as the installation of wiring for an inspection station positioned near the surface. These systems function for a limited duration, during which the sacrificial anodes degrade while providing protection to the tank or piping. As the sacrificial anodes approach the conclusion of their useful lifespan, their effectiveness diminishes, and they begin to corrode.
Electrochemical Corrosion Mitigation
The impressed current cathodic protection system typically utilizes electrodes with a much longer lifespan in comparison to a galvanic anode. These configurations include a rectifier that converts the alternating current power source into a direct current, finely tuned to provide the required protection. Since the power supplied to the electrode is not derived from its degradation, adjustments can be made to the power output if needed, as long as the electrodes continue to function.
A Comprehensive Checklist for Impressed Current Cathodic Protection Systems
You should schedule regular inspections conducted by a third-party inspector to verify that your cathodic protection system adequately protects your UST system. These inspections should occur:
- At least annually following the last examination.
- Within 60 days after any repairs to your UST system.
- Maintain records of at least the two most recent tests.
Additionally, inspect your rectifier regularly, recording readings at least every 60 days to ensure it operates within standard parameters. Keep detailed records of the facility’s operational lifespan.
Remember, never deactivate your rectifier!
What Cathodic Protection Does
Cathodic protection is an electrical technique utilized for corrosion prevention, particularly for safeguarding underground tanks and pipelines. It harnesses the inherent energy found in metallic materials. Essentially, metallic anodes are buried in proximity to the tanks and pipelines, interconnected by wires, and possessing significant natural energy. This energy facilitates the flow of electricity through the soil, wire, and buried metal. Over time, the buried anodes completely dissolve into the soil, thereby averting corrosion of the steel tanks or pipelines. Cathodic protection systems are divided into two main types: impressed current and sacrificial anode. Impressed current systems necessitate an external power source, whereas sacrificial anode systems do not.
Maximizing Cathodic Protection System Longevity
- Are you conducting regular inspections?
Regular testing and examination are advisable to validate the efficacy of your system. Implementing a monitoring and logging system can further aid in corrosion prevention.
Scheduled inspections and maintenance are essential for ensuring compliance with current Federal regulations. These regulations stipulate that your system must undergo testing by a qualified cathodic protection tester within six months of installation and every three years thereafter.
However, postponing testing for three years poses a significant risk of substantial damage to steel tanks and lines if the cathodic protection system has not been functioning correctly.
- Is your cathodic protection system providing adequate corrosion protection?
In impressed current protection systems, a rectifier control box is typically located near the tank monitor. The box includes a voltmeter as a standard feature, while an ammeter with a red/green indicator light is optional. It’s important to note that these meters and indicator lights only indicate the presence of power, not its sufficiency. If the indicator light on the system is red, corrosion protection is inactive. In such instances, immediate contact with a cathodic protection specialist is necessary.
- Are there exposed wires in the system?
Inspect the vicinity around the tanks for any broken or disconnected wires, especially those likely associated with the cathodic protection system. A damaged wire could result in a section of the system malfunctioning, indicating inadequate corrosion protection. If you detect such wires, consult your cathodic protection professional to confirm whether they are part of the cathodic protection system. If these wires are indeed part of the system, repairs will be necessary to ensure they are not exposed.
Always remember that any excavation in the tank field area can potentially disable the cathodic protection system. If you have any concerns, it’s advisable to contact your cathodic protection specialist for guidance.
Is a Cathodic Protection Inspection Necessary for Your Underground Tank?
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