SYMPOSIA PAPER Published: 01 January 1974
STP34776S

Thermal Conductance of Pipe Insulation—A Large-Scale Test Apparatus

Source

Thermal conductance measurements were carried out for pipe insulation on a large-scale test apparatus. A pipe 18 in. (0.457 m) in diameter and 20 ft (6.08 m) long was used. A chamber cooled to −70°F (−56.7°C) by expansion of liquid nitrogen surrounded the pipe. Water inside the pipe was heated to 160°F (71.1°C) by electrical resistance heaters. Several steady-state tests were made using air and water inside the pipe. A transient heat loss test was also made using water inside the pipe.

Close agreement was found between the theoretical steady-state thermal conductance factor and that experimentally measured. The numerical difference can be explained by center joint heat losses. Close agreement was also found in the transient response of the system to a loss of heat inside the pipe as experimentally recorded and compared to a theoretical approach.

Author Information

Kimball, LR
Technical Center, Owens-Corning Fiberglas Corp., Granville, Ohio
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Details
Developed by Committee: C16
Pages: 135–146
DOI: 10.1520/STP34776S
ISBN-EB: 978-0-8031-4638-9
ISBN-13: 978-0-8031-0372-6