A laboratory method fordeterming the effectiveness of thermal insulation systems at cryogenic temperatures is described. This method appears to be a satisfactory tool for comparing thermal insulation systems installed on pipes. The results obtained seem to be representative of actual applications because they include the effects of pipe diameter and of protective and fastening materials.
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References
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"Standard Test Method of Steady-State Thermal Transmission Properties by Means of Guarded Hot Plate," ANSI/ASTM C 177-76, ASTM Standards, Part 28, 19-52 (1978).
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"Standard Test Method for Thermal Conductance and Transmittance of Built-Up Sections by Means of the Guarded Hot Box," ANSI/ASTM C 236-66, ASTM Standards, Part 18, 76-87 (1978).
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ASTM C-420, ASTM Standards, Part 14, 172-179 (1967).
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"Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter," ANSI /ASTM C 518-76, ASTM Standards, Part 18, 213-244 (1978).
