The topical problem for transmission pipelines, which are exploited after the end of predicted exploitation lifetime, is the assessment of technical condition and prognostication of residual life. Because of remarkable expenses, which arare necessary for complete renewal of exploited pipelines, currently the exploitation is performed following their technical condition. The usage of nondestructive diagnostic operation methods, where the in-line inspection apparatus is used, lets to detect and identify the significant quantity of defects to determine their geometrical parameters with quite high degree of credibility. There are also cases, when results of in-line inspection do not conform to results of local diagnostics. In these cases the additional calculation of allowable pressure of pipeline section that has certain defect is performed. At this paper one of these cases is discussed. ASME manual for evaluating the remaining strength of corroded pipelines. [5] It is a supplement to the ASME B31 code for pressure piping. The manual was developed in the late sixties and early seventies at Battelle Memorial Institute (USA) and provides a semiempirical procedure for the assessment of corroded pipes. As an example the analysis of corrosive type defect will be performed. The calculation on residual strength will be performed.