USCG Exam PracticeLube oil and fuel oil systems
A vessel's steam turbine main propulsion plant experiences a complete failure of the forced lubricating oil system. Under 46 CFR §56.50-80, which TWO requirements apply to this installation?
- ✓ The turbine must shut down automatically upon lube oil system failure, and an emergency lube oil supply must operate automatically and sustain lubrication until the machinery comes to restCorrect
- B. The turbine must shut down automatically upon lube oil system failure, and the operator must manually engage an emergency hand pump within 30 seconds
- C. An independent auxiliary lube pump must start automatically, and the turbine may continue operating at reduced power until the main pump is restored
- D. The emergency lube oil supply must be manually activated by the engineer on watch, and the turbine must be brought to rest within five minutes
Why A 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. 46 CFR §56.50-80(i) additionally requires steam driven propulsion machinery to have an emergency lube oil supply that operates automatically upon failure and is adequate to provide lubrication until the equipment comes to rest. Both requirements apply simultaneously.