The two-stroke cycle main propulsion engines...

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Question 1 of 2066636eef28f7522a1c520408

The two-stroke cycle main propulsion engines on the harbor tug to which you are assigned are fitted with turbochargers for scavenging purposes. Assume that you are checking the air box drains in an installation that is valved with external drain piping to a drains tank. When you open the air box drain valves, no drainage occurs when in fact there is an accumulation of oil and moisture on the floor of the air boxes. What should you do?

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🔍 Key Concepts

• Two-stroke diesel scavenging air boxes and how oil/moisture accumulate there • Purpose and design of air box drain openings and external drain piping • Safety risks of high-pressure air, crankcase/air box pressures, and ignition sources near oil residue

💭 Think About

• Think about which method of clearing a blocked drain opening gives you control and lets you feel if there is a solid obstruction, instead of just forcing it through blindly. • Consider what could happen if you suddenly increase pressure in a space where there is an accumulation of oil mist or liquid oil. • Ask yourself which option best matches good engineering practice and standard safety procedures for clearing small drain holes in engine systems.

✅ Before You Answer

• Verify which choices involve changing internal pressures (crankcase or air box) and assess the fire/explosion risk with oil present. • Check which method could damage the drain piping or valves versus which is more gentle and precise for clearing a small opening. • Confirm which action is most consistent with safe engine-room maintenance practices: controlled, localized clearing versus system-wide pressure changes.

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