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Old April 17th, 2018, 13:23   #15
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Join Date: Dec 2001
Location: St Louis
Fuel Economy: fantastic

Many ships switch from HFO (heavy fuel oil) to MGO (marine gas oil) when in port or within a certain distance from a populated area anyway. Some only run the more refined MGO exclusively now, which is not quite the same as #2 diesel, but much closer than HFO and the emissions reduction is significant.

From EPA release:

"Emission measurements were taken on one test vessel while steaming between, approaching,
and hotelling at the Ports of Houston, Veracruz and Alta Mira. It was found that switching from
HFO (with a 3.79 % sulfur content) to MGO (with a 0.01% sulfur content) achieved significant
reductions in emissions of SOx and PM (2.5 micron in size) and small reductions in NOx – 89,
80 and 5 percent respectively – at a 2 percent increase in vessel operating costs, due to the
higher cost of lower-sulfur fuel."
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