<P> When released into water, such as a river or ocean, residual oil tends to break up into patches or tarballs--mixtures of oil and particulate matter such as silt and floating organic matter - rather than form a single slick . An average of about 5 - 10% of the material will evaporate within hours of the release, primarily the lighter hydrocarbon fractions . The remainder will then often sink to the bottom of the water column . </P> <P> In the maritime field another type of classification is used for fuel oils: </P> <Ul> <Li> MGO (Marine gas oil) - roughly equivalent to No. 2 fuel oil, made from distillate only </Li> <Li> MDO (Marine diesel oil) - A blend of heavy gasoil that may contain very small amounts of black refinery feed stocks, but has a low viscosity up to 12 cSt so it need not be heated for use in internal combustion engines </Li> <Li> IFO (Intermediate fuel oil) A blend of gasoil and heavy fuel oil, with less gasoil than marine diesel oil </Li> <Li> MFO (Marine fuel oil) - same as HFO (just another "naming") </Li> <Li> HFO (Heavy fuel oil) - Pure or nearly pure residual oil, roughly equivalent to No. 6 fuel oil </Li> </Ul> <Li> MGO (Marine gas oil) - roughly equivalent to No. 2 fuel oil, made from distillate only </Li>

Difference between heavy fuel oil and marine diesel oil
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