Patent ID: 6487518
Filing Date: 2002-11-26
Classification: G01B

Abstract:
A thickness reducing evaluation system for pipes in pipe lines, in particular for pipes in pipe lines made of either a carbon steel or a low alloy steel in a plant controlled under demineralized water, comprising:a pipe thickness measurement result data base unit which stores pipe thickness measurement results for respective measurement points performed during inspection of the pipe lines; a point pipe thickness reducing speed calculation unit which calculates a pipe thickness reducing speed through comparison of thickness measurement results at present inspection with thickness measurement results of the pipes in the pipe lines performed at previous inspection both of which are stored in the pipe thickness measurement result data base unit; a pipe line condition measurement unit which is constituted by a first measurement subunit for measuring pipe line temperature or fluid temperature inside the pipe lines, a second measurement subunit for measuring wetness of the fluid in the pipe lines and a third measurement subunit for measuring fluid speed in the pipe lines; a pipe line condition data base unit which stores pipe line condition data from the pipe line condition measurement unit; a pipe thickness reducing speed model formula constructing unit which constructs a mathematical formula expressing pipe thickness reducing speed using at least one of the measurement result of pipe line temperature or the measurement result of the fluid temperature inside the pipe lines, the measurement result of wetness of the fluid in the pipe lines and the measurement result of the fluid flow speed in the pipe lines as parameters and by making use of maximum values of the pipe thickness reducing speed calculated by the point pipe thickness reducing speed calculation unit; and a maximum pipe thickness reducing speed calculation unit which calculates a maximum pipe thickness reducing speed based on the constructed pipe thickness reducing speed model formula by making use of pipe line conditions stored in the pipe line condition data base unit at respective pipe thickness reducing measurement points in the pipe lines.