A comparative assessment of the wall thickness margin taking into account the initial flaws in steam line elements

The postulated analogy between the influence on longevity of a relatively high extent of creep-caused microdamage and initial decrease in a sample’s cross section due to annular notch is used as a basis for carrying out an experimental study of the effect of temperature, stress, and loading time on the coefficient characterizing the relative residual longevity of metal after the occurrence of pore chains along the grain boundaries.