Thermal measuring and testing – Leak or flaw detection – With heating or cooling of specimen for test
Patent
1982-09-22
1984-12-04
Frankfort, Charles
Thermal measuring and testing
Leak or flaw detection
With heating or cooling of specimen for test
374 4, G01N 2572
Patent
active
044861036
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.
REFERENCES:
patent: 1869336 (1932-07-01), De Forest
patent: 3864958 (1975-02-01), Dreitzler et al.
patent: 3911727 (1975-10-01), Katsuta et al.
patent: 4034286 (1977-07-01), Lev et al.
Chisso Corporation
Frankfort Charles
Philpitt Fred
Schuster David R.
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