Question 44Steam Plants - QMED

The correct answer is C) Sentinel valve. A sentinel valve is a safety device found on the casing of a main propulsion steam turbine. It is designed to release excess steam pressure in the event of a malfunction or overpressure situation, protecting the turbine from damage. This is a key safety feature required by Coast Guard regulations for steam turbine propulsion systems. The other options, while relevant to steam turbine systems, are not specifically required on the turbine casing itself. The duplex relief valves, HP turbine bypass valve, and sliding beam are found in other parts of the steam propulsion system, but not directly on the turbine casing.