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1. 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 (Q/L) if the inner surface of the pipe is at 250 °F and the outer surface of the cork is at 90 °F. The thermal conductivities (in Btu/(h·ft °F)) of the substances concerned are: steel, 26.1; 85% magnesia, 0.04; cork, 0.03.

1. 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 (Q/L) if the inner surface of the pipe is at 250 °F and the outer surface of the cork is at 90 °F. The thermal conductivities (in Btu/(h·ft °F)) of the substances concerned are: steel, 26.1; 85% magnesia, 0.04; cork, 0.03.

Introduction to Chemical Engineering Thermodynamics
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
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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1. 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 (Q/L) if the inner surface of the pipe is at 250 °F and the outer surface of the cork is at 90 °F. The thermal conductivities (in Btu/(h·ft °F)) of the substances concerned are: steel, 26.1; 85% magnesia, 0.04; cork, 0.03.
Transcribed Image Text:1. 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 (Q/L) if the inner surface of the pipe is at 250 °F and the outer surface of the cork is at 90 °F. The thermal conductivities (in Btu/(h·ft °F)) of the substances concerned are: steel, 26.1; 85% magnesia, 0.04; cork, 0.03.
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