A whole new industry of service providers now offers tank cleaning, internal tank inspections, fuel polishing, tank bottom water and sludge/slime/particulates removal, and biocide treatment. The corrosion phenomenon is quite random, but reports seem to be increasing, perhaps because the petroleum equipment service industry has a much greater awareness today of the problem’s existence. But since then, the corrosion has been found to occur inside steel tanks as
Initially, many of the phone calls STI’s office received about corrosion of metallic equipment (particularly from 2007-2013) came from sites with non-metallic (FRP) tanks. Filters and strainers are rapidly becoming clogged with particulates that have a “coffee ground” appearance. This phenomenon did not exist 10 years ago.Įquipment in or under dispensers is also impacted, such as under-dispenser shear valves and metering equipment. Submersible turbine pump columns, ball float valves, overfill prevention/shut-off valves, and tank gauging sensors are deteriorating from a corrosion process over their entire surface, especially in the ullage area. The metal components within both fiberglass reinforced plastic (FRP) and steel underground storage tanks are experiencing corrosion. But with removal of much of the sulfur, gas station and c-store operators are experiencing a new problem in their underground storage tank system that did not exist before. Sulfur has been removed from diesel to encourage cleaner air from vehicle exhaust. Since then, several more related rules have been implemented. The US EPA promulgated its first rule limiting sulfur in diesel vehicle fuel in 2006.
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