Case 04: Operation issues - Operation in contact mode (low speed)

Typical machines affected

Single shaft com­pres­sors, machines driven by steam turbines, pipe­lines


Indications

  • Short operating life, dry gas seal failure
  • Low pressure/flow on primary vent
  • DGS: Strong contact between sliding faces (mainly secondary seal)

Causes

  • Operation in contact mode (stationary seal face and rotating seat of the DGS in contact), e.g. low speed turning, ratcheting and/ or long coast-down curves (more than originally specified)
  • Extended contact operation causes wear of the sliding surfaces and clogging of the grooves, affecting the lift-off effect and leading to increased torque and temperatures
  • Finally, it can lead to thermal cracks in the seal faces and/or leakage alarms on primary vent

EagleBurgmann solution

  • DiamondFace coated seal faces (all conditions) 
  • DGS32 – dry gas seal with carbon seal face (limitations on temperature, pressure and leakage

Results & benefits

Increased reliability:

  • Increased lifetime of dry gas seals
  • No more unplanned seal related compressor shut-downs

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