A 1¼ -inch schedule 40 steel pipe is insulated with a 2-in layer of asbestos covered by a 3-in layer of 85% magnesia. If the temperature inside the pipe wall is 300 F and the atmospheric temperature is 80 F, what is the heat loss per foot of pipe?

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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A 1¼ -inch schedule 40 steel pipe is insulated with a 2-in layer of asbestos covered by a 3-in layer of 85% magnesia. If the temperature inside the pipe wall is 300 F and the atmospheric temperature is 80 F, what is the heat loss per foot of pipe? Thermal conductivities are 26 Btu/hr-ft- F for steel, 0.087 Btu/hr-ft- F for asbestos, and 0.034 Btu/hr-ft- F for magnesia. For 1¼ in Sch 40 steel pipe, outside diameter=1.660 in, inside diameter=1.380 in, thickness= 0.14 in

a. 25.4 Btu/hr
b. 39.1 Btu/hr
c. 48.7 Btu/hr
d. 58.9 Btu/hr

From the question, what is the temperature between the two insulations?

a. 212.2 F⁰
b. 200.9 F⁰
c. 188.5 F⁰
d. 177.5 F⁰

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