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Calculation and experimental analysis have shown a good correlation between a cumulative damage factor (CDF) and depth of defects in cold-pilgered tubes.
In the present standard API 579/ASME FFS, the safety assessment of pipes with multiple local wall thinning defects is given, while as well as the influence of load condition, the influences of arrangement and relative depth of defects are ignored, which may influence the safety assessment considerably.
The lower value is more consistent with the simulated depth of defects calculated using TRIM program[10].
Similar(57)
The dependence of the maximum depth of defect activation on the type of defect and on the energy of the ion was investigated for two typical values of the activation energy.
The results show that the estimated thermal diffusivities and the size and depth of defect are in good agreement with the reference values, and the relative deviations are less than 5%.
The depth of defect region extended to 263 nm (±12) with an effective diffusion length of 56.7 nm (±0.3).
Thirdly, the agreement of the diagnostic outcome was assessed in terms of area and depth of defect.
For different arrangements and relative depths of defects, based on a limit value 0.05 of the quantified index of the interaction between defects, a relatively systematic safety assessment of pipes with multiple local wall thinning defects under different load conditions has been proposed.
In this paper, the influence of the interaction between multiple local wall thinning defects on the remaining strength of pipes at different arrangements and depths of defects under different load conditions (pressure, tension-bending moment and compression-bending moment) are studied.
This characterization is carried out by the means of an ML approach which allows the length and depth of the defects to be estimated.
The analysis showed that the depth of the defects has a stronger influence than the radius, and that the interaction of these parameters is not relevant.
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