A method for improving the accuracy of evaluating the dimensions of flaws in walls of tubular elements of structures |
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Authors: | L V Poluyan |
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Affiliation: | (1) MTL/CANMET, Natural Resources Canada, Ottawa, Canada;(2) TransCanada PipeLines Ltd., Calgary, Canada |
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Abstract: | An algorithm for evaluating the real accuracy of the basic measuring instrument (exterior or in-tube flaw detector) in measuring
parameters of flaws of a particular inspected tube was proposed on condition that the basic measuring equipment has no systematic
error, while a verification instrument is considered as “absolutely” precise or “reference.” A statistical method of increasing
the accuracy of evaluating the dimensions of flaws in thin-walled tube elements was developed on the basis of a correlation
between the dimensions of flaw parameters. It can be taken as a basis for finding real values of parameters of flaws and for
performing reliable calculations of the residual strength and residual life, for scheduling optimal periods for the next inspection
of pipelines, and for ranging segments of a pipeline by a risk criterion, thus providing optimal scheduling of repairs. |
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