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Blast furnaces are the heart of any integrated steel plant. In blast furnaces smelting of iron from iron ores is accomplished by means of various chemical reactions between the iron ore, coke and fluxes. High temperature and hot blast creates an atmosphere conducive for the chemical reactions as the charged raw materials move in the downward direction. Liquid metal is tapped from the bottom of the blast furnace. The outer shell of the blast furnace serves to isolate the reactions inside the furnace from the atmosphere in addition to providing mechanical support to the furnace. The shell generally has a multi layered structure consisting of an outer steel shell, followed by layers of refractory, cooling staves, followed by an innermost refractory lining as show in Fig. 1. This multi layered structure aids in containing heat within the furnace for maximum efficiency and the cooling staves keep the outer shell from overheating which may compromise the stability of the structure of the furnace.1) The staves are metallic (either copper or steel) plates with embedded cooling channels for circulating cooling water which helps in efficient heat extraction at the furnace wall. Efficient heat extraction is essential in maintaining an accretion layer at the inner surface of the furnace shell for prolonging campaign life of the furnace.2) The staves are designed with ribs towards the inner side of the furnace at regular spacing as shown in Fig. 1. The ribs serve as fins for better heat extraction and also provide slots to hold the Thickness Measurement of Blast Furnace Staves with Curved Cooling Channel Using a Specially Designed Ultrasonic Probe