| 摘要 |
PROBLEM TO BE SOLVED: To apply a complex piping system for reducing measurement time by estimating thickness distribution, based on a temperature distribution in a natural cooling process of a pipe which has been heated into an isothermal state. SOLUTION: A plurality of thermocouples 11 re connected to a pipe 21 whose thickness is to be measured, and while heaters 12 placed on an upstream and a downstream of the pipe 21 are controlled by a temperature controller 13, heat is applied so that the regions of the pipe 21 to be measured are at isothermal state (approximately 100 to 350 deg.C). When the pipe 21 reaches a prescribed isothermal state, the heaters 12 are turned off, and a temperature distribution of the pipe 21 being cooled spontaneously is measured by a temperature distribution measuring device (thermograph) 14, and a computer 15 transfers temperature data taken at arbitrary times and arbitrary coordinates of the pipe 21 to a computer 16. The computer 16 compares the temperature data at arbitrary time and coordinate as the optimum value for heat conduction analysis results of each thinned form, which are stored in a heat conduction analysis data base 16 for determining the thickness distribution of the pipe 21 (maximum thinned depth, maximum thinned angle, thinned length, and thinned angle).
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