Posted by RodInNS on December 05, 2013 at 06:04:48 from (216.118.158.123):
In Reply to: Diesel gelling posted by Tom vertiz on December 04, 2013 at 20:29:32:
What most people refer to as 'gelling' is nothing more than the water in their tanks, lines and filters freezing up. That's not gel, it's ice, plain and simple. Adding methyl alcohol or many of the various diesel additives will add a quantity of methyl alcohol that will melt the ice. It also holds the water in immulsion in the fuel... so if you're lucky it will plug the filter quickly... and you change the filter to get rid of the water.
As far as diesel fuel is concerned... there are 4 grades that I'm aware of. 1D, 2D, 4D and 6D. 1D is the lightest weight fuel with the least energy and is intended for the coldest weather usage. 2D is the standard blend that's used for medium-high speed diesels in most climate conditions although it will be blended down with some 1D for winter use in many areas. 4D is a heavy oil for slow speed marine engines and 6D, IIRC, is basically like bunker oil and needs to be heated to flow... In terms of clear vs died fuel... the only difference today is the DYE. In years past when the first tier of emissions reductions came along they developed LSD (Low Sulphur Diesel) which reduced the sulphur content from around 5000 ppm to about 500 ppm. This was only mandated on highway engines, thus there was a difference between dyed and clear fuel. When Tier III emissions came along, the addition of DPF (Diesel Particulate Filters) in the exhaust mandated an Ultra Low Sulphur Diesel (ULSD) with a sulphur content below 15 ppm so that the sulphur didn't cause problems in the emission systems. Since that mandate has extended to both highway and off highway engines, the ULSD requirement is extended to ALL diesel fuel since 2007. So... today the only difference is the dye... beyond the fact that ULSD has slightly less BTU/gal of energy as compared to LSD or high sulphur oil (furnace oil).
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