procurement of walker seal housing assembly, swivel bolt and coal pipe flanges for 8.5 e 9 coal mill of unit no 1 to 4 , ph-i and ii, at sgtps, mppgcl, birsinghpur , walker seal housing assembly with fasteners of 8.9e-9 coal mills ( as per sample ) each set consists:- 01.air seal housing material:- ci gr. 210 02.air seal hosing cover material:- ms is-2062 03. air seal distance piece material:- ms is -2062 fasteners:- ht bolt & nuts ( grade 8.8 ) m 12x65 ( 08 nos ) m12x95 ( 08 nos ) , coal pipe flange size:- od= 825 mm id= 630mm thickness= 25 mm 16 holes of dia 26 mm at pcd 756 mm material: ms-is2062 , coal pipe flange size: od= 610 mm, id=457 mm thickness= 25 mm 16 holes of dia 26 mm at pcd 542 mm material: ms-is2062 , coal pipe flange size: od 614mm, id 465 mm thickness- 25 mm 16 no. holes of dia 26mm at 543 mm pcd material: is 2062 ( weldable ) , swivel bolt with nut & spring washer material: swivel= en-24 nut= en-24 washer= en-8 ( as per drawing )