When steam is being admitted to the propulsion turbine, how long should the rotor remain idle?

When steam is admitted to the propulsion turbine, it is crucial for the rotor to remain idle for no more than 5 minutes. This time limit is significant because allowing the rotor to remain idle for too long while under steam pressure can lead to thermal expansion issues, potential stress on turbine components, and could result in damage to the turbine itself.

Operating within this 5-minute timeframe helps ensure that the system remains stable and that the components do not experience excessive thermal cycling or unnecessary wear. Proper maintenance practices dictate that minimizing idle time under steam conditions is essential for the longevity and reliability of the turbine. This standard emphasizes the importance of maintaining safe operating procedures to protect equipment integrity and ensure effective propulsion system performance.