A liquid at 300 F flows through a 3-in. steel pipe (schedule 40)covered with a ½ in. thickness of asbestos insulation. The ambienttemperature is 80 F. The inside surface film coefficient is 40Btu/hr-sq ft-F, and the outside surface film coefficient is 4.0Btu/hr-sq ft-F. The thermal conductivities of steel and asbestoscan be taken as 25 and 0.11 Btu/hr-ft-F respectively. What's theheat loss per foot length of the pipe?
