competitive-bidding for supply of boiler refractory for various sks chini mills ltd, nanpara-bahraich for the season 2023-24 super heat duty costable refractoryas per specification given below a1-2 03 above 45 % service temp. minimum 1400 degree centrigratebd 2.5 / cm2 ccs minimum kg. / cm2 after 24 hrs. casting & dreaded 24 hrs. 110oc.50 kg bags, sun cast super , fire clay morter as per specification al-2 o3 above 45% , fire cement dry ( fire cley ) ( mortors ) packed in 50 kgs. bags acc make alumina above 45% , fire cement liquid , special fire bricks as per specification al-2, o3 , minimum 30.4 ap % max. 25% pcr minimum 320 ortem . ccs kegs. / cm2 350 delta minimum 1400oc ficar 3 minimum 1.5 at 1400oc for 5 hrs. temp. tolerance + 2% or + 1m whichever is greater as per factory drawing. , insulating bricks / calcium silicate block bricks as per is-2042 ap minimum 65% ccs minimum 15 kgs. / cm2 bcs ( ortem cones ) minimum 27, picar for 2% hrs. at 1250oc service temp. minimum 1250oc size tolerance minimum ± 2% or ± 1m whichever is greater. as per drg. no. sksm / 188 / 97fig. d type , insulating bricks / calcium silicate block bricks as per is-2042 ap minimum 65% ccs minimum 15 kgs. / cm2 bcs ( ortem cones ) minimum 27, picar for 2% hrs. at 1250oc service temp. minimum 1250oc size tolerance minimum ± 2% or ± 1m whichever is greater.as per drg. no. sksm / 145 / 93 fig. b , standard fire bricks above 45% al-2, o3 alumina asper drg. no. sksm / 222 / 99a type , standard fire bricks above 45% al-2, o3 alumina asper drg. no. sksm / 222 / 99b type , standard fire bricks above 45% al-2, o3 alumina asper drg. no. sksm / 222 / 99c type