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Fuel Quality. Richard Nelson National Biodiesel Board. ASTM D 6751 – Biodiesel Fuel Specification. Fuel quality is of the utmost concern and importance to the biodiesel industry. ASTM specifications set the “gold standard” for materials, fuels, safety, new product testing, etc.

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fuel quality

Fuel Quality

Richard Nelson

National Biodiesel Board

astm d 6751 biodiesel fuel specification
ASTM D 6751– Biodiesel Fuel Specification
  • Fuel quality is of the utmost concern and importance to the biodiesel industry.
  • ASTM specifications set the “gold standard” for materials, fuels, safety, new product testing, etc.
  • ASTM D 6751 is the specification for biodiesel fuels irrespective of the feedstock source and/or processing method.
  • Standard ensures that biodiesel has the fuel properties for safe operationin a compression ignition engine and ensures that poor processing has not contaminated the fuel with other products that would create engine damage.
fuel quality3
FUEL QUALITY
  • Fuel quality is of the utmost concern and importance to the biodiesel industry.
  • ASTM D 6751 is the specification for biodiesel fuels irrespective of the feedstock source and/or processing method.
    • National Quality Program (BQ-9000) Launched for Biodiesel Marketers and Producers
    • Look for BQ-9000 Certified Marketers: Biodiesel’s ‘Good Housekeeping’ Seal of Approval
    • Assures “cradle-to-grave” fuel quality

“cradle”

“grave”

critical quality parameters biodiesel production
Critical Quality Parameters – Biodiesel Production
  • Complete Reaction
  • Removal of Glycerin
  • Removal of Catalyst
  • Removal of Alcohol
  • Absence of free fatty acids
b100 meeting d 6751 critical
B100 meeting D 6751 Critical
  • If B100 meets D 6751, then most blends of B20 or lower will meet D 975 parameters
  • OEM’s are becoming increasingly comfortable with B20
  • Almost all problems in the field are from B100 that didn’t meet D 6751
    • Minnesota problems were from out of spec fuel
  • Its impossible to tell if B100 met spec once it is in blended form, so testing must occur at B100 level
  • NBB has active program to encourage enforcement of B100 compliance with D 6751
the downstream distributor should
The Downstream Distributor Should:
  • Only accept ASTM D 6751 biodiesel – check for COA.
  • Buy from a BQ 9000 Certified Producer or Marketer.
  • Understand fuel handling characteristics of both distillate and biodiesel fuel.
  • Become knowledgeable about biodiesel benefits and prepare to convey them to the consumer.
biodiesel cleaning effect
Biodiesel cleaning effect
  • B20 has a cleaning effect on tanks and fuel systems when first used.
    • Fuel filters may need to be changed when switching to B20 for the first time. This happens about 2% of the time. After the system is clean, filter changes go back to normal
  • B2 has not exhibited this cleaning effect
  • The cleaning effect is more dramatic as the blend level goes up
protecting your fuel
Protecting Your Fuel
  • Review fuel analysis reports
  • If fuels fail to meet the specification, notify your fuel supplier immediately
  • Retain samples for analysis
  • Have an independent testing laboratory on your team
going over b20 requires caution
Going over B20 requires caution
  • Cold flow
  • Materials compatibility
  • Cleaning effect
  • Fuel Stability a bigger concern
  • Lower BTU content becomes noticeable
  • Engine oil may become diluted with fuel
  • Not supported by OEM’s

http://www.biodiesel.org/pdf_files/Biodiesel_Blends_Above%20_20_Final.pdf

b100 quality versus current specifications
B100 Quality versus Current Specifications
  • 16 of 32 B100 samples fail the specifications – 50% failure rate
  • The failure rate increases if B99 samples are included (21 out of 38 fail)
    • 1% diesel fuel may cause flashpoint below 130ºC
  • Typically failing for total glycerin or flash point
  • 6 failed multiple properties and 2 samples failed 3 properties

*B99 samples not tested by D6584