The diesel fuels burned in auxiliary and main diesel engines of tugboats operating in harbor areas are required to meet certain specifications. Among these are limits of certain contaminants to limit atmospheric emissions to acceptable levels. Which of the following soluble contaminants is applicable?
• Air pollution regulations for marine diesel fuel (think about what comes out the exhaust stack) • Difference between soluble vs. insoluble contaminants in fuel • Which contaminants are most tightly controlled to reduce harmful emissions in port/harbor areas
• Ask yourself: which of these choices is commonly regulated in fuel to cut down on airborne pollutants like particulates and acidic gases? • Consider which contaminants would mostly cause engine/fuel system problems versus which are targeted specifically for cleaner exhaust emissions. • Think about which option is a chemical element in the fuel, rather than a type of sludge, solid, or separate liquid phase.
• Identify which options are mainly insoluble or suspended contaminants (sludge, sediments, separate water) rather than dissolved in the fuel. • Recall which fuel spec limit is directly connected to SOx (sulfur oxide) emissions from ship exhaust under emission control rules. • Before choosing, verify which contaminant is most often named in harbor/Emission Control Area (ECA) fuel requirements for cleaner air.
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