USCG Exam PracticeAuxiliary machinery and shipboard systems
Under 46 CFR, when the exhaust side of machinery is not designed for the full inlet pressure, which of the following is an acceptable means of protecting the exhaust side from overpressure?
- A. A stop check valve fitted on the inlet side, arranged to seat against boiler pressure
- ✓ A sentinel valve or other warning device on the exhaust side, together with a trip device that will close the inlet valveCorrect
- C. A bypass fitted around the inlet stop valve, sized for full flow capacity
- D. A drain valve fitted at the lowest point of the exhaust piping to relieve accumulated condensate pressure
Why B is correct
46 CFR §56.50-15(i)(2) permits a sentinel valve or other warning device fitted on the exhaust side, together with a trip device that will close the inlet valve, as one of two acceptable means of protecting the exhaust side from overpressure. The other acceptable means is a relief valve on the exhaust side per §56.50-15(i)(1).
Cited:46 CFR §56.50-15