Answer to Question #344469 in Mechanical Engineering for Eyaaaah

Question

A 6-in. nominal diameter mild steel pipe (OD=6.625 in.) has an inside

surface temperature of 500 F. The pipe is covered with a 3 in. layer

of 85 percent magnesia insulation which has a surface temperature

of 100 F. Determine the heat loss in Btu/hr-100 ft of pipe.

k for magnesia = 0.043Btu/hr-ft-F

k for steel = 28.2