Question 378Steam Plants - 1st Asst/Chief

70% to pass

If a tube should leak in an operating main steam turbine lube oil cooler, the water will not immediately contaminate the oil because the _______________.

Asecond-stage discharge valve will open

Bplug type bypass valve will open

Coil pressure is greater than the water pressure

Dcooling pump would automatically shut off

AI Explanation

The correct answer is C) the oil pressure is greater than the water pressure. In a main steam turbine lube oil cooler, the oil pressure is typically higher than the water pressure. This means that if a tube should leak in the cooler, the higher oil pressure will prevent the water from immediately contaminating the oil. The oil will push the water out, rather than allowing the water to enter the oil system. The other answer choices are incorrect because they do not accurately describe the pressure relationship between the oil and water in this situation. The second-stage discharge valve, plug-type bypass valve, and cooling pump would not directly prevent water contamination due to a leaking tube.

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Official Resources

46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center

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