Furnace Air Tightness Test



Ø  Scope- Boiler Furnace, Air and FG Duct upto ID Fan Inlet
Ø  Why- To test Tightness of Furnace wrt Environment not for Strength
Ø  Ensure- All PTWs of BMD( PP, Rotary, Mills, Ash handling) cancelled and Clearance Available


S.No
Area/system
Status Req
Actual Status
1
Bottom Ash Hopper / CG Manholes


2
Seal Trough


3
APH & Eco hopper Flushing Apparatus


4
ESP / ESP Duct Manholes


5
Mill/Scrapper Manhole


6
Boiler Manholes/ Peep Holes


7
SADC


8
Feeders Doors ( front, Rear)


9
SA/ PA duct Manholes/Drains



Ø  Start SAPH-A/B &PAPH-A/B Main Motors
Ø  Start one Set of ID/FD fans. Slowly raise Airflow and Furnace Pressure . Start AC Scanner
Ø  Start another Set of ID/FD fans increase Pressure further
Ø  Start Both PA fans, Slowly raise PA Header Pr to 800 mmWC. Start Seal air fan also
Ø  Keep Furnace Pressure to +120 mmWC
Ø  For Identification of any leakage, Local round to be taken with Maintenance Person. Following area to be visted :-
Ø  Boiler 1st Pass, 2nd Pass, APH Flue Gas duct, ESP i/l and o/l ducts, ESP Passes, Secondary Air duct, Hot & Cold Primary duct, Mill HAG/HAD/CAG/CAD
Ø  APH guide and support Bearing area
Ø  Dead Zone chamber in s-Panel & Reheater Goose Neck Area
Ø  Boiler Pent House
Ø  Slowly reduce Furnace Pressure to Normal and Stop PA/FD/ID Fans
Ø  FATT Completed.


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