USCG Exam PracticeAuxiliary machinery and shipboard systems
Under 46 CFR, where 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 bypass valve installed on the inlet side set to open at design pressure
- ✓ A sentinel valve on the exhaust side together with a trip device that will close the inlet valveCorrect
- C. A pressure gauge with a high-pressure alarm on the exhaust side
- D. A stop check valve installed between the inlet and exhaust sides
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 an acceptable means of overpressure protection. A relief valve in the exhaust side is the other acceptable option per §56.50-15(i)(1); a pressure gauge alone or a stop check valve are not listed.
Cited:46 CFR §56.50-15