Sump Evacuation System


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The Sump Evacuation System (SES) restores the required differential pressure in the DE bearing sumps to prevent oil leaks during low power operation, engine load rejects, or trips from high power. This leakage could lead to internal Turbine Rear Frame (TRF) coking. 

Applicable Turbine Models


Upgrade Benefits

  • Reduced oil leaks. Maintains the necessary differential pressure across bearing sump oil seals to reduce leakage during low power operation or gas turbine trips.
  • Lower maintenance costs. Oil leaks can lead to internal turbine rear frame (TRF) coking. By reducing the leaks, additional maintenance costs associated with TRF coking issues can be significantly reduced or eliminated. 
  • Improve Maintainability

How it Works

  • The necessary differential pressure across the bearing sump oil seals is maintained with an electric motor-driven blower installed in the air/oil separator discharge line. The blower is enabled when the high pressure rotor speed is greater than 300 rpm and when the differential pressure across the sump and ambient air is less than 8 psig.
  • Mechanical scope. Includes the installation of the vacuum blower in the air/oil separator line, corresponding support structure, vibration isolators, flexible stainless steel ducting, and lifting lugs.
  • Electrical scope. Includes the installation of a new pressure differential transmitter, vacuum blower motor, and new electrical cable to the interconnection point.
  • Control sequencing. Modifications to control sequencing software.