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 1^st Pass, 2^nd 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.