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ULSD fuel Lubricity
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Posted by dej(JED) on March 01, 2007 at 05:31:40 from (66.212.151.134):
I hear so much miss information about diesel that I thought I might try to help. I know someone will bash me, but what the heck. Sulfur occurs naturally in crude and is passed on to fuel in the production process. There are well over 100 different species of sulfur compounds that can be present. Sulfur has been an additive that has been in oils for years. It improves both lubricity and load carrying abilities. ASTM D 975 is the spec that should be followed for Diesel fuels, but it is not proactive and makes no allowance for lubricity per say. The days of a proactive refining industry are long since gone. There are very few R&D dollars available these days. The only time they look at anything is as a reaction to a problem. When you remove sulfur you remove lubricity and if the additive doesn't get put in the older injector pumps will fail. I have been seeing a lot of it at the laboratory these days. A lot of the older Farmall pumps are failing. It happens when the ULSD is used and not when the off road fuel is used. You can never really be sure that the additive is in the ULSD. ASTM will catch up, but it takes about 5 years for the specs to get changed.
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