Quick Answer
Underground propane tanks can corrode due to moisture in the soil, but rusting is a concern only if the tank is not coated with a protective layer or is damaged.
Corrosion Threats
Underground propane tanks face unique corrosion risks due to exposure to moisture in the soil. Soil types, moisture levels, and the presence of corrosive substances like salt or sulfates can accelerate tank degradation. According to the Propane Education & Research Council (PERC), a 10-year lifespan is typical for underground propane tanks, but corrosion can lead to premature failure.
Protective Coatings and Liners
To mitigate corrosion risks, many underground propane tanks are coated with a protective layer or lined with a corrosion-resistant material. Common coatings include epoxy, polyurethane, and ceramic-based materials. A 1/4-inch (6 mm) thick coating is a common standard for underground propane tanks. Additionally, some tanks are equipped with a liner that can withstand aggressive soil conditions and extend the tank’s lifespan.
Inspection and Maintenance
Regular inspections are crucial to detect any potential corrosion issues early on. A qualified inspector should check for signs of rust, corrosion, or damage to the tank, piping, and connections. If corrosion is detected, the affected area should be repaired promptly. It’s also essential to maintain the tank’s protective coating by reapplying a new layer every 5-7 years, as recommended by the manufacturer.
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