[Vwdiesel] ULSD Typical Spec (fwd)

[Val Christian]

It's quite likely that your supplier, particularily if it's a retail 
supplier, is blending the fuel for the local ambient temperatures.
As discussed earlier, the blending agent would likely be ULSD No 1 
fuel, which is primarily kerosine.

Blending by suppliers is a good thing.  Bulk purchases, such as 
fleet purchases may or may not be blended.  If usage volume is low,
one may find themselved in cold WX with unblended fuel.


Val


> 
> Now, I just have not had that issue, We had a solid week of temps below  
> 10 degrees, and the golf started every time, no sputtering, not even a  
> whimper, it's kept outside all the time, so being in a warm{er} garage  
> isn't a factor.
> On Feb 9, 2007, at 6:24 PM, Val Christian wrote:
> 
> > Forwarded message:
> >> From: Val Christian <val at mongobird.com>
> >> Subject: ULSD Typical Spec
> >> Date: Tue, 6 Feb 2007 15:13:10 -0500 (EST)
> >>
> >> OK, local drivers and mechanics are saying the ULSD doesn't work for  
> >> them
> >> with this week's WX (-20C, 0F) type temperatures.
> >>
> >> Some mail list people have stated that ULSD has a depressed pour  
> >> point.
> >>
> >> I looked at the .mil presentations on ULSD and they specifically  
> >> complain
> >> about poor pour points, poor cloud points, and seal failures.  They  
> >> also
> >> say that there is effectively very little or no ULSD No 1 fuel  
> >> (kerosine)
> >> to blend with the ULSD #2.
> >>
> >> I found a spec, pdf attached, that claims that a typical cloud point  
> >> is 14F,
> >> and a pour point of 0F, without additives.  If that is really  
> >> typical, no
> >> wonder we are having problems.  At -10F, it's a wonder we can suck
> >> jello out of the fuel tank!
> >>
> >> Seems like there's trouble in River City.  My guess is that this  
> >> winter will
> >> be cause for reblending, and possibly cause for ULSD #1.  Technical  
> >> press
> >> articles claim that the parafin in ULSD is such that it is long  
> >> chains, and
> >> will precipitate out at much higher temperatures.  +14F would fit my
> >> concept of a higher temperature.
> >>
> >> Val
> >
> >
> > Here's the txt extract of the pdf I foolishly attempted to forward:
> >
> >
> > TYPICAL SPECIFICATIONS FOR ULSD
> >
> > DIESEL FUEL ULSD
> >
> > PHYSICAL PROPERTIES TYPICAL ANALYSIS
> > API GRAVITY 30
> > LBS./ GALLON 7.0
> > FLASH POINT, F. 150
> > DISTILLATION, F.
> > INITIAL BOILING POINT 365
> > 50 % RECOVERY 500
> > 90 % RECOVERY 540-640
> > END POINT 650
> > POUR POINT, F. 0
> > CLOUD POINT, F. 14
> > CFPP, F. 12
> > VISCOSITY @ 40 C., CST 2.5
> > SULFUR, % WT. <0.04 (400ppm) <0.0015 (15ppm)
> > CETANE INDEX NUMBER 40
> > COLOR RED or UNDYED
> > WATER & SEDIMENT NIL
> > COPPER STRIP CORROSION @ 122 F. 1A
> > ASH, % WT. NIL
> >
> > NOTE #1: Values listed above represent typical properties. These  
> > values may vary between terminal locations.
> >
> > NOTE #2: ULSD FUEL has lubricity requirement of <520um wear scar per  
> > HFRR (High Frequency Recipricating
> > Rig) test
> > _______________________________________________________________________ 
> > _
> >
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> >
> >
> 
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