Research Article
Feb 1970

Effect of Coating on Thermal Conductivity of Pipes

Publication: Transportation Engineering Journal of ASCE
Volume 96, Issue 1

Abstract

The effect of internal and external coating on overall thermal conductivity of pipes of different diameters and thicknesses is described. A number of examples with pipes of different materials and coatings of various thicknesses are considered. The term conduction factor is defined, and results are presented in the form of curves relating the conduction factor to coating thickness for different parameters. Tests show that internal coating is superior from the standpoint of the insulating characteristic of the system. If the pipe is used as a heat-transfer medium, coating is a detrimental factor. For external corrosion protection, the coating should be applied externally, as thinly as possible. Internal coating is advantageous for the transfer of steam, fuel, gas and other similar materials, as the coating reduces internal corrosion and serves as a better insulator than an equal thickness of exterior coating. The basic problem is the cost of uniform coating application, besides the mentioned factors.

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Published In

Transportation Engineering Journal of ASCE
Volume 96Issue 1February 1970
Pages: 71 - 78

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Published in print: Feb 1970
Published online: Feb 5, 2021

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P. Mahmoodi
Sr. Res. Specialist, Central Res. Labs., 3M Co., St. Paul, Minn.

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