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LHC II Procedure tow*, SUPERHEATER TRIP RE-START LHC H Scope Restart a superheater after a trip. Hazards Bums Steam or Condensate hammer Blowing a PSV Wet steam to the 475# Header Minimize sight seers in the area. Safety Equipment Monogoggles to Relight Burners - this pertains to those in the immediate area as well as the one performing the job Tools Ignitor Past Incident History When re-lighting burners there is a possibility of them backfiring. Operating Parameters The variables for operating limits, consequences and responses are listed in the "Normal Operations Procedure". The file is located on the LHC l! operating discipline computer under the critical procedures directory. Procedure I._____Open liinitorque valve to muffler wide open to keep wet steam from getting to header. The check valve should prevent the incoming 475# steam header from being vented to the muffler. 0;'DATA'PR0IX)C I Suplimp.dc REVISED 5-15-90 DOW COM IDI AI I \l I'ACil I Ol 2 05 16'% 10:00 AM DO A 0009 LHC II /' / a l c cl n r c 2. ____Monitor temperatures at 2TK.-7I aiul 12U inlets 3. ____Close all burner valves and burner shutters. 4. ____Determine cause of trip (low fuel gas pressure or tire eyes), 5. ____Bypass flame detector system per flame detector operation and bypassing procedure. 6. ___ Reset Amot trip, by pulling toggle switch to extended position and lifting handle. Be sure fuel gas control valve is slightly open to allow fuel gas to the transmitter. The Amot trips at 5 psig pressure should be kept below 21#. 7. ___ Relight a burner. 8. ___ Put the flame detector system back in operation. See flame detector operaiton and by-passing procedure 9. _Relight burners to bring temperature back to operating range of 650 - 750F As burners are lit the shutters can be reopened 10. ___When the steam out gets up to temperature, slowly close limitorc|ue valve off the muffler vent to allow the superheater to pressure up and vent to the 475# header. O.'UA'IAPkODOl'l Suphlrtp Joe RliVISKI) S-IJ-W. l>oA COM |l)i,\ 11 \i !'A>l 2 ill : 05 In 10 00 AM DO A CONFIDDNTIBl