USCG Exam PracticeLube oil and fuel oil systems
The lubricating oil system on a vessel's main steam turbine propulsion plant experiences a sudden failure. Which regulatory requirement applies specifically to this type of installation?
- A. The system must be designed to function at a permanent 15° list and 5° trim only
- B. An independent auxiliary lubricating pump must activate automatically upon lube oil failure and supply oil until the machinery comes to rest
- C. The turbine must be fitted with a bypass around the oil cooler that opens automatically upon lube oil failure
- ✓ The turbine must shut down automatically upon lube oil system failure, and an emergency oil supply must operate automatically to provide lubrication until the machinery comes to restCorrect
Why D is correct
46 CFR §56.50-80(g) requires steam turbine driven propulsion machinery to shut down automatically upon failure of the lubricating system, and §56.50-80(i) requires an emergency supply of lubricating oil that operates automatically upon failure and is adequate to provide lubrication until the equipment comes to rest. Both requirements apply together.
Cited:46 CFR §56.50-80