procurement of various types of metallic expansion bellows for boiler pressure parts, pa outlet duct, aph interlocking and o/l duct, esp interlocking and o/l duct and id fan interlocking and o/l duct at stage-1, sgttp through capex 2025-26. , procurement of various types of metallic expansion bellows for boiler pressure parts, pa outlet duct, aph interlockingand o/l duct, esp interlocking and o/l duct and id fan interlocking and o/l duct at stage-1, sgttp through capex 2025-26. , normal diameter 4300x4300x8 design # pressure -7.8, design temp 128deg c fatigue life 1000 axial movement â±24mmaxial spring rate 1642 n/mmarea of use :- after esp dis charge in the common duct.matl:spring steel , normal diameter 4000x 3000x8design # pressure -7.8,design temp 128deg c fatigue life 1000 axial movement â±32 mm axial spring rate 1673 n/mmarea of use :- beforeesp in let in the common duct.matl:spring steel , normal diameter 9000x 2000x8 design # pressure -7.8, design temp 128deg c fatigue life 1000 axial movement â±32 mm axial spring rate 1323 n/mmarea of use :- at aph o/l flue duct just before convergent duct in the vertical direction.matl:spring steel , normal diameter 3200x4060x6 design # pressure4.4 kpa design temp 344 deg c fatigue life 1000 axial movement -210mm axial spring rate 145 n/mmlateral movement 65 latera l spring rate 55 n/mm lateral mov 45 n/mm spring rate 39 n/mm area of use :-hot secondary air duct at windbox inlet (each set , normal diameter 3200x4060x6 design # pressure4.5 kpa , design temp 344 deg c fatigue life 1000 axial movement â±50mm axialspring rate 845n/mm area of use:-hot secondar y air ductafter aph inlet of windbox.matl:spring steel , metallic expansion joint,d1700x2400 pressure 4.5kpa,temp 344 deg c,fatigue life 1000 axial movement â±56 mm axial spring rate 575n/mm,mat spring steel,hot secondary air duct of unit 1& 2 , metallic expansion joint,d2920x920 pressure 16.1 kpa,design temp 338deg c fatigue life 1000 axial movement â±28 mm axial spring rate 584n/mm,mat spring steel,hot pa at mill inlet of