Corrosion Timelines

  •  1900 – 2006, few issues with diesel, fuel kept usable with basic housekeeping of cleaning the tank bottom of freestanding water and sludge
  •  2006 – Ultra Low Sulfur Diesel (ULSD) introduced, sulfur reduced 500 ppm to 15 ppm
  •  Chemistry of the fuel changed: immediately noticed excessive engine wear/failure, fixed with additives and biodiesel blends
  •  InterFacial Tension (IFT) dropped: IFT ability of two fluids to repeal each other
  •  High IFT, diesel and water do not mix; water collected on the tank bottoms: 1900-2006
  •  Low  IFT, emulsified water absorbed and bonds with the ULSD biodiesel blends, 2006+
  •  2007 - Corrosion first noticed. Intense study begins.
  •  2010 - SAE J1488 updated to reflect lower IFT. Tests filtration efficiency of removing bonded water from ULSD and biodiesel blends
  •  2012 - Battelle report “Severe and rapid corrosion has been observed in systems storing and dispensing ultra low sulfur diesel (ULSD) since 2007”. “MIC suspected” (Microbial Influenced Corrosion)
  •  2016 - EPA’s final report on corrosion report states 83 percent of the USTs studied have moderate to severe corrosion. Since corrosion continues over time, this will reach 100 percent severe