supply of spares of coal pipe for overhauling of unit no. 11, btps, obra, sonebhadra, u.p. , victaulic coupling 18 , gasket for 18 l victaulic type coupling l-530 , gasket for 20 l victaulic type coupling s.r-20 l-630 , ceramic lined fuel inlet elbow (short) 90 degree (size: l = 1455 mm (outer surface), inner surface round=560, inner surface straight=410 mm od585 id 480 mm), ceramic tiles of thickness-20mm, specification of tiles: (1) alumina content: 88+1%, (2) bulk density 3.3 + 0.1 gm/cc, (3) hardness- 8 to 9 moh, (4) cold crushing strength > 3200kg/cm, (5) water absorption <0.5%, (6) max service temp- 1300 deg. centigrade. ms casting of thickness-5.0mm, of the following angles. , fuel inlet elbow ceramic lined long 90 degree (size: l = 2110 mm (outer surface), inner surface round=1220, inner surface straight= 1020mm od 585 id 480 mm), ceramic tiles of thickness-20mm, specification of tiles: (1) alumina content: 88+1%, (2) bulk density 3.3 + 0.1 gm/cc, (3) hardness- 8 to 9 moh, (4) cold crushing strength > 3200kg/cm, (5) water absorption <0.5%, (6) max service temp- 1300 deg. centigrade. ms casting of thickness-5.0mm, of the following angles , ceramic lined transition piece (size: l = 600 mm, 18=od490 id440 mm; 20=od 550 id480 mm) ceramic details ceramic tiles of thickness-20mm, specification of tiles: (1) alumina content: 88+1%, (2) bulk density 3.3 + 0.1 gm/cc, (3) hardness- 8 to 9 moh, (4) cold crushing strength > 3200kg/cm, (5) water absorption <0.5%, (6) max service temp- 1300 deg. centigrade. ms casting of thickness-8.0mm