An Integrated Reliability Method with a Newly Developed Interaction Rule for Steel Pipelines with Multiple Corrosion Defects
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Bibliographic record
Abstract
Although essential contributions have been made to the reliability analysis of corroded pipelines, the interacting effect between adjacent corrosion defects is rarely considered, let alone the effects of the corrosion depth and steel grade on the interacting effect. This paper proposes a new reliability method to fill the gap. First, the finite-element method and regression analysis were applied to investigate how the corrosion depth and steel grade impact the interacting effect and develop new interaction rules. Second, the new interaction rule, burst pressure model, Monte Carlo simulation (MCS), sensitivity analysis, feature scaling, and artificial neural network (ANN) were integrated to predict reliability. The proposed method combines several approaches to achieve a more accurate and efficient reliability estimation of pipelines with multiple corrosion defects than conventional assessment methods. An example is given to demonstrate the method. Results show that the limit spacing distance grows as the corrosion depth increases. The growth of the limit spacing distance of the X80 pipeline is more significant than that of the X65 pipeline. Existing interaction rules introduce conservatism to the prediction of the limit spacing distance. Two new interaction rules were developed and can realize better prediction accuracy by considering the corrosion depth and steel grade. Besides, the interacting effect significantly affects the maintenance time. The maintenance time lag between the X65 pipeline ignoring and considering the interacting effect is about 7.5 years. Different interaction rules result in different reliability descending paths. Because the new interaction rule was developed for this case, it could provide a more accurate reliability analysis. The trained ANN shows excellent prediction accuracy and high computing efficiency. The mean squared error in the reliability predicted by the ANN is 2.4×10−6. The elapsed time of the ANN prediction is about 50 times shorter than that of the MCS.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it