The water content of fuel is easily checked on board ship to insure that serious problems do not result. What is the maximum water content of fuel that can be tolerated without serious problems resulting?
• Typical maximum water content in marine fuel before it causes injection and combustion problems • Effects of water contamination on fuel pumps, injectors, and combustion • Order of magnitude: compare 0.0001, 0.001, 0.01, 0.1 as fractions (or percentages) of total fuel
• Convert each option into a percentage and ask yourself which value is commonly considered an acceptable upper limit for water in fuel on ships • Think about which level of water content would most likely start to cause corrosion, poor atomization, and possible engine damage • Consider what you know about fuel treatment systems (settling tanks, purifiers): are they designed to remove all water, or to keep it below a small but realistic limit?
• Convert each answer choice into percent (%) water by volume or as a fraction of 1.0 to compare realistically • Eliminate any options that would mean an obviously very high water content for machinery-grade fuel • Recall that acceptable water content is typically a small fraction of a percent, not a large, visible amount of water in the fuel
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