You are onboard a vessel with a slow-speed...

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Question 1 of 205eccefa2bacbc34ba4d477a6

You are onboard a vessel with a slow-speed crosshead type engine. The fuel just received has a significantly lower sulfur content than the previous bunkers. Which of the following would be a concern due to the reduced sulfur content?

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🔍 Key Concepts

• Effects of low-sulfur fuel on cylinder lubrication in slow-speed crosshead diesel engines • Purpose of the base number (BN) in cylinder oil and how it relates to sulfur content in fuel • Which systems (purifier, injection, fuel pressure) are mainly affected by viscosity and density, not sulfur content

💭 Think About

• When sulfur content in fuel decreases, what happens to the amount of sulfuric acid formed in the cylinder, and how does that change cylinder oil requirements? • Which of the listed options is directly selected or specified based on the fuel’s sulfur level, rather than its viscosity or density? • For each option, ask: is this normally adjusted when switching between high-sulfur and low-sulfur fuels in Emission Control Areas (ECAs)?

✅ Before You Answer

• Identify which parameter is chosen to neutralize acid formation from sulfur in fuel combustion • Separate items that depend mostly on fuel viscosity/density (e.g., purifier disk, injection temp, supply pressure) from those linked to fuel sulfur chemistry • Recall that slow-speed crosshead engines often require different cylinder oil characteristics when operating on HFO with high sulfur vs low-sulfur or distillate fuels

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