Page 469 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Be st Practice 7 .32 Lube, Seal and Control Oil System Best Practices

Fig 7.32.3 Overspeed detection (Courtesy of Elliott Co.)

Loss of control oil pressure
Spring force automatically overcomes oil force holding valve open
(approximate set point 50–65% of normal control oil pressure)
Manual trip (panic button)
Manually dumps control oil on command
Optional
Turbine excessive axial movement

Fig 7.32.4 Internal protection

440