I propose that we need to develop some sort of document that allows the members of Subcommittee E to judge whether a proposed new fuel is fit for purpose as a fuel in a modern compression-ignition engine.
As we know, D975, as a specification for diesel fuel, was written to describe a particular cut from a barrel of petroleum oil. That was the assumption from the beginning of the specification and that is the reason most of the properties currently listed in D975, Table 1. There have been relatively few changes to the meat of the specification since it was first approved in 1949. However, as we have learned with biodiesel, the properties in D975 are not always sufficient to describe a fuel (or fuel component) that will be trouble free in normal use. I believe we have to start from the assumption that any fuel for a diesel engine must not only burn in the engine but also not cause problems for the engine and the user. In other words, we need to start from the point of view of the intended use rather than the fuel itself. I propose that we need to develop some sort of document that allows the members of Subcommittee E to judge whether a proposed new fuel is fit for purpose as a fuel in a modern compression-ignition engine. As such, I have started a list of properties/tests that we might consider as indicators of whether a fuel is fit for use in a modern compression-ignition engine. My list is given below. I welcome all suggestions and comments, as well as, volunteers. I plan to discuss this further at the meeting in Kansas City. All properties currently listed in D975, Table 1 Density Bulk Modulus Thermal Stability by D6468 Cold soak filterability test Energy Content (volumetric) Compatibility with common elastomers Compatibility with common fuel system metals Water separation characteristics Compatibility with petroleum diesel Compatibility with biodiesel (since biodiesel is now an approved component in D975) Some kind of injector deposit tendency test would be good but I do not have a candidate test to recommend Oxidation stability by D2274 or some other method Volatility (vapor pressure) Complete distillation curve
Keywordsdiesel fuel, fit for purpose
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