Turbine Mill Trip Conditions

The following conditions shall cause a Mill to trip…

  • LOS or emergency stop pressed
  • Mill and feeder running from remote, oil flame not detected with either feeder speed <30 % or coal flame not detected signifying low coal and no ignition source
  • Feeder running from remote and coal and oil flame neither detected assuming flame monitoring system is healthy signifying loss of coal flame without ignition source
  • Loading gas pressure very low
  • Lub oil pressure very low signifying no lubrication to Mill gear box and bearings
  • Both PA fans stopped
  • Mill running from remote for >30 secs and PA flow below minimum
  • Mill running from remote for >30 secs and Secondary air flow < 45%
  • Seal air pressure very low
  • MFT or Mill hard relay