USCG Exam PracticeLube oil and fuel oil systems
The lubricating oil system on a vessel's main steam turbine propulsion plant must be designed to do which of the following upon failure of the lube oil system?
- A. Activate an audible alarm only and allow the operator to manually shut down
- ✓ Automatically shut down the turbine and supply emergency oil until the machinery comes to restCorrect
- C. Switch to the auxiliary lube oil pump and continue operation at reduced speed
- D. Isolate the failed pump and transfer suction to the settling tank
Why B is correct
46 CFR §56.50-80(g) requires steam turbine driven propulsion machinery depending on forced lubrication to shut down automatically upon failure of the lubricating system. Additionally, §56.50-80(i) requires an emergency supply of lubricating oil that operates automatically and is adequate to lubricate until the equipment comes to rest.
Cited:46 CFR §56.50-80