2. Problem 10A.1 from BSLK: Heat loss from an insulated pipe. A standard Schedule 40, 2-in. steel pipe (inside diameter 2.067 in., and wall thickness 0.154 in.) carrying steam is insulated with 2 in. of 85% magnesia covered in turn with 2 in. of cork. Estimate the heat loss per hour per foot of pipe if the inner surface of the pipe is at 250F and the outer surface of the cork is at 90F. The thermal conductivities (in Btuhr ftF ) of the substances concerned are: steel, 26.1; 85% magnesia, 0.04; cork, 0.03