The following information was recorded after...

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Question 1 of 205eccefa0bacbc34ba4d47081

The following information was recorded after a recent L.P. turbine bearing installation. The bearing temperature was logged at the indicated time intervals as: 1200-110°F (43°C)1210-123°F (51°C)1220-136°F (58°C)1230-149°F (65°C)1240-153°F (67°C)1250-155°F (68°C)1300-155°F (68°C) The shaft RPM and lube oil cooler outlet temperature remained constant. The readings indicate __________.

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🔍 Key Concepts

• Journal bearing temperature trends during initial run after installation • Difference between normal wear-in vs. signs of wiping or preload • Effect of constant RPM and constant lube oil cooler outlet temperature on interpreting bearing temperature changes

💭 Think About

• Look at how the temperature changes over time: Is it steadily rising, leveling off, or continuing to climb? What does that pattern usually suggest about bearing condition? • If RPM and lube oil temperature are constant, what does a change in bearing temperature usually tell you about what is happening at the bearing surface? • Which option(s) would you expect to show a continuous, uncontrolled temperature rise rather than a rise that stabilizes?

✅ Before You Answer

• Verify whether the temperature stabilizes or keeps increasing at the end of the recorded period. • Consider which conditions (water in oil, wiping, excessive preload, normal wear-in) would likely cause rapid, continuous temperature rise and possible alarm, instead of a controlled rise. • Check that the bearing temperature values are within typical operating range for journal bearings at steady load and speed.

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