Got in a debate on another board about a similar issue, here is some information I found on the web from Cenex.
Local Casey’s has had out of service bags on the diesel pumps for a couple weeks now. I assume it won’t pump at these temps.
Understanding Cloud Point and CFPP (cold filter plugging point)
Cloud point All fuels must be blended 5-10 degrees above cloud (fuel temp not air temp) Significant variation between fuels Typical #2 cloud pt – 6 – 14 degrees F Use pipeline spec as baseline
CFPP Usually within a degree or two of cloud point in an unadditized fuel
Product CFPP* w/o Cold Flow Additive CFPP* With Cold Flow Additive 100% X or D grade +10°F -3°F 90% X or D + 10% #1 +7°F -6°F 80% X or D + 20% #1 +4°F -9°F 70% X or D + 30% #1 +1°F -12°F 60% X or D + 40% #1 -2°F -15°F 50% X or D + 50% #1 -5°F -18°F 40% X or D + 60% #1 -8°F -21°F 30% X or D + 70% #1 -11°F -24°F 20% X or D + 80% #1 -14°F -27°F
Note: This chart is for guideline purposes only. Diesel fuel low temperature characteristics may vary substantially from one source to another and this chart assumes the product meets typical specifications. *CFPP (Cold Filter Plugging Point) is the temperature at which wax crystals will plug a fuel filter.
WINTER BLENDING WITH BIODIESEL • Blending of neat biodiesel (B100) with petroleum diesel should occur when both product are 40 degrees F or above. • Low blends (B2 or B5) typically have very similar (within 0 to 5 degrees) Cloud Point and CFPP characteristics to conventional diesel products and can be treated in a similar fashion #1 blends, Winter Aid III additives, or both. • Animal fat or higher level soy blends may increase the CFPP of the fuel as much as 5 degrees for every 10% of B100 used.
Impact of #1 Fuel
#1 fuel typically has a very low cloud point (-40 to -70F)
#1 blended with #2 reduces the cloud point and CFPP of the blend
“Rule of Thumb” Adding 10%-#1 will decrease the cloud point by approximately 2 degrees
#1 when blended with 5% or greater with biodiesel will have a negative effect on the cloud point
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