Managing corrosion risk in underground propane tanks

Underground propane tanks are susceptible to corrosion. Protective coatings and anode bags cannot ensure protection indefinitely. A well-planned testing program is critical to understanding your inventory and can help you catch any corrosion before it compromises safety.

1. Understand the risk – Underground tanks use a sacrificial anode, often referred to as “the bag,” connected to the tank. When corrosion attempts to occur, the anode takes the corrosion instead of the tank. Over time, however, the anode will be consumed and stop providing protection.

2. Identify code requirements and maintain records – Any effective program needs good data. Start by assessing your tanks, identifying which ones are underground and where each one falls within its required inspection and testing cycles.

3. Plan ahead for testing season – Spring and summer are ideal times for cathodic protection testing. You must build a plan well in advance, including ordering necessary materials.

4. Execute with training and precision – Drivers and technicians must be trained in this testing procedure so that it is done correctly and safely. Once the drivers are trained, plan your routes with intention so you can efficiently complete these tests and inspections.

5. Be prepared to act – Inspections are only valuable if findings are addressed promptly. Be ready to correct any deficiencies promptly when they’re identified.

Bryan Wendt is the propane operations and safety manager at CHS Inc. He can be reached at 651-355-8546 or bryan.wendt@chsinc.com.

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