Load Carrying Capacities of Small-Diameter Pipe Bends Under Internal Pressure: Analytical and Computational Predicitions
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Bibliographic record
Abstract
Abstract The performance and embedded conservatism of common modeling approaches used for predicting load carrying capacities were evaluated for small-diameter pipe bends typically found in CANDU reactors. Comprehensive analyses were conducted using both an analytical approach and detailed finite element modelling with commercial code ABAQUS. Small diameter pipe bends, with and without local wall thinning, under loading by internal pressure were investigated. The adopted modelling approach incorporated variability in pipe bend geometry and the characterization of material properties. The results obtained indicate that load carrying capacities of small-diameter pipe bends, either with or without local wall thinning but characterized by uniform wall thickness and single parameter material strength are conservatively predicted with analytical models in principle based on the limit load approach. However, detailed finite element modelling is needed for obtaining more accurate predictions of plastic instability pressure for pipe bends with local wall thinning. The reported investigation provides technical insights into the modelling approaches presently used for predicting load carrying capacities of small-diameter pipe bends under internal pressure loading; in addition, it has explored embedded conservatism while recognizing the existence of involved uncertainties. The results obtained emphasize the importance of detailed characterization of pipe bend thickness and material strength in such engineering predictions. This work has been performed under Canadian Nuclear Safety Commission (CNSC) Research and Support (R&S) project R765.1. The insights obtained may be used to further assess embedded conservatism in fit for service evaluations of CANDU outlet feeders experiencing wall thinning due to Flow Accelerated Corrosion (FAC). In addition, supplementary information informs the activities related to lowering the minimum required thickness below 75% of a straight pipe thickness by Article NB-3640 of Section III of the ASME B&PV Code for design pressure.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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