Method of and system for inspecting performance of heat-insulating layer surrounding a pipe
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United States of America Patent
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-
Dec 4, 1984
Grant Date -
N/A
app pub date -
Sep 22, 1982
filing date -
Sep 25, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of inspecting heat-insulation performance of a heat-insulating layer surrounding a pipe, which method comprises inserting an insulated electrical conductor line in the pipe having a heat-insulating layer therearound, in case where the pipe is a metal pipe, or another metal pipe laid along the pipe and placed in the inside of the heat insulating layer; causing an AC current flow through the conductor line to thereby induce a secondary current which flows through the pipe or another metal pipe; and measuring the temperature of various points of the outer surface of the heat-insulating layer by a non-contact thermometer to thereby determine the variance of the heat-insulation performance of the heat-insulating layer in terms of the variance of temperature thereof.
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