The maximum lube oil temperature leaving a...

Question 1 / 270705eccefa1bacbc34ba4d472e8

Question 1 of 270705eccefa1bacbc34ba4d472e8

The maximum lube oil temperature leaving a large, main propulsion steam turbine bearing should __________.

Question 1 of 27070

The maximum lube oil temperature leaving a large, main propulsion steam turbine bearing should __________.

🔍 Key Concepts

• Bearing lubrication requirements in large main propulsion steam turbines • Effect of high oil temperature on viscosity, film strength, and bearing life • Typical operating range for lube oil in turbine bearings vs. purifier discharge temperature

💭 Think About

• Which option talks about a fixed maximum temperature that would protect the oil’s viscosity and the bearing metal under heavy load? • Does the temperature of oil leaving the centrifugal purifier necessarily match what the bearings actually need for safe operation? • If outlet oil is allowed to be much hotter than inlet oil, what does that say about heat removal and potential damage to the bearing surfaces?

✅ Before You Answer

• Compare each choice to what you know about the safe temperature range for mineral lube oils in high‑speed machinery • Decide whether relative temperature rise (difference between inlet and outlet) or an absolute temperature limit is more important for bearing protection • Ask whether the centrifugal purifier’s outlet temperature is a control point for bearing safety, or just part of the conditioning system

Question 1 of 27070

The maximum lube oil temperature leaving a large, main propulsion steam turbine bearing should __________.

never exceed the inlet temperature by more than 70°F

never exceed 170°F

not exceed the normal lube oil outlet temperature from the centrifugal purifier

be always maintained at 130°F

Question 1 / 270705eccefa1bacbc34ba4d472e8

Question 1 of 270705eccefa1bacbc34ba4d472e8

The maximum lube oil temperature leaving a large, main propulsion steam turbine bearing should __________.

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Question 1 of 27070

The maximum lube oil temperature leaving a large, main propulsion steam turbine bearing should __________.