purchase of supply of spares for air preheater ( model 27.5 vitm 2000 72 pa ) of 2x250mw, unit no. 10 and 11, stps, sarni purchase of supply of spares for air preheater ( model 27.5 vitm 2000 72 pa ) of 2x250mw, unit no. 10 and 11, stps, sarni , inboard & outboard static seals for hot end sector plates; ( one set = requirement for 1 aph ) , static seal for cold end sector plates, ; ( one set = requirement for 1 aph ) , inboard & outboard static seals for cold endsector plates; ( one set = requirement for 1 aph ) , diaphragm plates for cold end -300mm ( 1 set- 36 nos. plates ) , cold end grating ( one set = requirement for 1 aph ) , , static seal for axial seal plate plates, ; ( one set = requirement for 1 aph ) , , t-bar including t-bar pin, t-bar tab and t-bar clip for hot end