The Exhaust and Relief Valves (CERV) are designed to relieve turbine exhaust to the Auxiliary Exhaust System when a differential pressure reaches which value?

The Exhaust and Relief Valves (CERV) are designed to relieve turbine exhaust to the Auxiliary Exhaust System when a differential pressure reaches which value?

• A. 1 psi
• B. 2 psi
• C. 3 psi
• D. 4 psi

Answer: (B)

Exhaust and relief valves operate based on the pressure difference between the turbine exhaust path and the Auxiliary Exhaust System. When that differential pressure reaches two pounds per square inch, the valve opens and routes turbine exhaust into the Auxiliary Exhaust System. This relieves the higher-pressure side and protects the exhaust piping and turbine from excessive backpressure during transients or fault conditions. That two-psi setting is a balance: low enough to provide timely relief and prevent damage, but high enough to avoid nuisance opening during normal operation. If it were set lower, it would vent too often and waste energy; if set higher, relief might not occur quickly enough to protect the system.

Exhaust and relief valves operate based on the pressure difference between the turbine exhaust path and the Auxiliary Exhaust System. When that differential pressure reaches two pounds per square inch, the valve opens and routes turbine exhaust into the Auxiliary Exhaust System. This relieves the higher-pressure side and protects the exhaust piping and turbine from excessive backpressure during transients or fault conditions.

That two-psi setting is a balance: low enough to provide timely relief and prevent damage, but high enough to avoid nuisance opening during normal operation. If it were set lower, it would vent too often and waste energy; if set higher, relief might not occur quickly enough to protect the system.