If the main turbine bearing lube oil...

🔍 Key Concepts

• Main turbine bearing lubrication requirements and what happens if lubrication is lost, even briefly • The difference between reducing speed and performing an immediate emergency stop in terms of bearing protection • Purpose and limitations of emergency/hand lube oil pumps and gravity tanks in a turbine lube oil system

💭 Think About

• Ask yourself: If lube oil pressure is at ZERO at the main bearing, how long can you safely keep the turbine turning before damage begins? • Which action actually guarantees that metal-to-metal contact in the bearings is stopped as fast as possible? • Do any of the options assume that lube oil level or supply can recover while the turbine is still rotating with no pressure?

✅ Before You Answer

• Verify what zero lube oil pressure at main bearings implies for immediate risk of seizure and damage • Check which choice removes or minimizes shaft rotation the fastest versus which ones try to ‘fix’ the oil system while still running • Confirm whether hand pumps or gravity tanks can instantly provide enough pressure/flow at full or reduced load to protect heavily loaded turbine bearings

If the main turbine bearing lube oil pressure drops to 'zero' and cannot be restored immediately, you should __________.

notify bridge and crash stop the engine

reduce turbine rotor speed until lube oil sump level returns to normal

reduce turbine rotor speed and pump lube oil with the hand emergency pump

strike down makeup lube oil from the gravity tanks

🔍 Key Concepts

💭 Think About

✅ Before You Answer