SAE J1488 Filtration

 SAE J1488 filtration dries diesel to less than 200 ppm, removing all forms of water: free, dissolved, emulsified and the new form, bonded/entrained, which forms an hydrogen bond with biodiesel, and is difficult to remove. Filters tested against SAE J1488 with a 92% efficiency can keep your tank below 200 ppm.


"Linking Fungal and Bacterial Proliferation to Microbiologically Influenced Corrosion in B20 Biodiesel Storage Tanks"

Published 25 February 2020

From the report: "Our in situ study showed greater corrosion near the bottom of each tank where the  presence of water and  a fuel-water interface was more likely. The interaction of fuel and  water allows for enhanced microbial growth, and in turn, greater  corrosion than water limited spaces within a fuel tank. "

EGSA Powerline Magazine:

"Corrosion Mechanism in Emergency Generators and Storage Tanks, and Corrosion Control"

The  Electrical Generating Systems Association is the world’s largest  organization exclusively dedicated to On-Site Power Generation, and  includes most emergency generator manufacturers.

Mission Critical Magazine:

"Keep Generators and Storage Tanks Alive  in the Wake of the Corrosion Crisis 

Don’t discover the cost of corrosion the hard way"


END USERS: HOW CORROSIVE IS YOUR DIESEL? Three Inexpensive Tests Will Tell You

New factors have caused the corrosion crisis, so new fuel tests are needed; 

three tests from a single diesel sample, and the total lab cost is under $100 for all three.

  • TAN (Total Acid Number) ASTM D664 - indicates how acidic your diesel is. Maximum .08 mg KOH/g 
  • ASTM D6304 (Karl Fisher titration), registers *all* water, including the new water format, bonded  (entrained) to biodiesel molecules. This water enables microbial growth in the diesel column. Less than 200 ppm controls MIC
  • ISO 4406 standard particulate test - general indicator of diesel quality, plus can also indicated the amount of microbial growth. Maximum 18/16/13

Testing for Water in Biodiesel Blends - Why a Karl Fisher Titration (ASTM D6304)is a Requirement for Testing for Bonded (Entrained) Water

100 % biodiesel holds 15 to 25 times more water than that of pure 100% diesel. This is because both water and biodiesel molecules are polar (they have a positive and negative charge to the molecule), so the water molecules are attracted to, and bond quickly to, the biodiesel molecule. Pure diesel is not polar, so water does not bond to it. The actual bonding mechanism of water to biodiesel is by a hydrogen bond. While weaker than a covalent or ionic bond, it still attaches multiple water molecules to a biodiesel molecule. The hydrogen atoms (positive charge) in the biodiesel bonds to the oxygen atom of water (negative charge). This is why pure biodiesel can hold 15 to 25 times more water than pure diesel, and why bonded water is so difficult to remove. 

Because the water is bonded to the biodiesel molecule, it does not show up in the “clear and bright” visual test, nor does the water precipitate out to the tank bottom until the biodiesel blend hits saturation, at which time there is a high ppm water bonded to biodiesel. The only way to detect the water is by using a Karl Fisher (KF) titration (ASTM D6304), which uses titration and an electric current through the diesel sample to provides the energy necessary to break the hydrogen bond and release the water. The water can now be detected and measured. The test procedure is common and inexpensive. To date this test has not been used in the diesel storage industry, because before the use of biodiesel, water was not bonded to diesel, so most users are not aware of this test. It is critical that a Karl Fisher test be used to detect water levels in stored diesel.

End User Testing for Microbial Growth, Simple, Fast and Inexpensive

End users can now get a fuel test kit specifically for microbiological contamination, which enables you to identify contamination in 15 minutes or less. Two companies that supply these kits are:

LuminUltra Technologies:

Conidia Bioscience FuelStat


Pat has been involved in diesel corrosion control since 2013, and has contributed to organizations such as the EGSA, the EPA, the Uptime Institute and BioFuels Digest. Pat is a lecturer in BioFuelNet  Canada’s Advanced Biofuels Course, hosted on McGill University’s  myCourses  platform.

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Contact Us 613-794-6090

Contact us for the corrosion control solution, and the background on the diesel corrosion crisis

If you have an emergency backup generator that cannot fail, contact us for information on the corrosion issue in the diesel infrastructure, and solutions on corrosion control 

Octane Systems Inc