The Need for 10 -μ Diesel Dispenser Filters * “The Good Housekeeping Seal of Approval”

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NCWM Fuels and Lubricants Subcommittee (Phone Conference)

Prentiss Searles, American Petroleum Institute | December 15, 2015

Review of Dispenser Filter Item 237-3 (July 2015) requiring engine fuel dispensers to have a 10 micron or smaller nominal pore-size filter, and proposed 2016 amendment carving out exceptions for dispensers with flow rate ≥ 15 gallons per minute and dispensers with flow rate of ≤ 15 gpm in certain cold weather states during winter months to have a 30-micron or smaller nominal pore size filter.

  • Review of findings of corrosion
    • Battelle ULSD Corrosion Study
      • Clean Diesel Alliance Project Conclusions (2012): Acetic acid is suspected cause of corrosion (acetobacteraceae); Ethanol and acetic acid observed in diesel tanks; Additives not involved in corrosion
    • USEPA Study
      • MIC suspected cause of corrosion; Ethanol/glycerol suspected food sources; Acid production from breakdown of alcohols; Water elimination key to controlling
    • CRC Report No. 667
      • Recommendations for maintaining clean distribution system and filters; Accumulated water and sludge promote corrosion of bottom of fuel tanks; Water most common contaminant; Water more soluble in biodiesel/blends
    • Anecdotal Evidence of Success “Good Housekeeping”
      • Speedway (2,750 retail locations) – no acute corrosion issues for a decade; extensive/aggressive housekeeping programs
  • Review of Fuel Quality
    • ASTM Specifications D975: X8.4 Water and Sediment Controls
    • Review of concern that can’t use 10-micron filters in cold weather or with biodiesel
    • 10-micron dispenser filters lessen particle loading on filters, extending filter life
    • How tank management can impact filter life
  • Conclusion
    • Water and microbial activity responsible for corrosion and particulate in USTs
    • Good housekeeping greatly reduces these concerns
    • 10-micron dispenser filter provides last defense before vehicle

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