Operation of Blast Furnace is quite complex in nature that relies on multiple technological aspect. To keep its operation in the safe zone it has to be operated non-stop on its rated capacity. Extended low production process is very detrimental for Blast Furnace refractory which unfortunately has been done perforce during last couple of years due to shortage of raw material. It has to be realised that Pakistan Steel Mills Blast Furnace No 1 was relined in 1996 and from then it is being operated continuously. As per the experts opinion, the normal refractory life of the Blast Furnace is 18 to 20 years. So Blast Furnace No 1 is already mature for its complete relining.