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I saw recently that there are more grades of diesel fuel than what is available at the pump, such as 4,5 and 6 used in large locomotives, turbines, etc. Does anyone know the difference between these grades and reg road diesel?
Diesel fuels are covered by the ASTM D975-04a specification, which describes seven grades of diesel:
[Grade No. 1-D S15, a special-purpose, light middle distillate fuel for use in diesel engine applications. Higher volatility than that provided by Grade No. 2-D S15 fuel. Maximum sulfur content 15 ppm.
Grade No. 1-D S500, a special-purpose, light middle distillate fuel for use in diesel engine applications. Higher volatility than that provided by Grade No. 2-D S15 fuel. Maximum sulfur content 500 ppm.
Grade No. 1-D S5000, a special-purpose, light middle distillate fuel for use in diesel engine applications. Higher volatility than that provided by Grade No. 2-D S15 fuel. Maximum sulfur content 5000 ppm.
Grade No. 2-D S15, a general-purpose, middle distillate fuel for use in diesel engines, especially in applications of varying speed and load. Maximum sulfur content 15 ppm.
Grade No. 2-D S500, a general-purpose, middle distillate fuel for use in diesel engines, especially in applications of varying speed and load. Maximum sulfur content 500 ppm.
Grade No. 2-D S5000, a general-purpose, middle distillate fuel for use in diesel engines, especially in applications of varying speed and load. Maximum sulfur content 5000 ppm.
Grade No. 4-D, a heavy distillate fuel, or a blend of distillate and residual oil, for low- and medium-speed diesel engines in applications involving predominantly constant speed and load.
Heavier fuel oils Grade 5 and 6 (residual), which are used primarily for heating purposes, are described by ASTM D396.
__________________ Ken
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