Abstract
This report presents the results of a test program to evaluate the relative performance of three high-temperature thermal insulation systems for steel pipes. Each insulation was installed in two 1 ½-in. thick layers over 3-in. steel pipe and covered by a stainless steel jacket. Nine-ft. 10-in. lengths of insulated pipes were exposed to the ASTM E119 time/temperature profile for two hours and the temperatures of the pipe wall were measured. Times to reach a temperature of 1000° F on the pipe wall were recorded to be approximately one hour for mineral wool insulation and one and one-half hours for perlite insulation. The third sample, calcium silicate insulation, had reached a maximum temperature of 850° F on pipe wall at two hours when the test was terminated. (Extra polation of the curve indicated that calcium silicate insulation would have reached 1000° F in two hours and twelve minutes.) The report also contains a pictorial assessment of damage to the insula tion and pipe after the exposure.
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