Safe Life of Line Pipe in Hydrogen Blended Transport
Bibliographic record
Abstract
Abstract A multi-year collaborative project with the Natural Sciences and Engineering Research Council (NSERC) of Canada and the University of Alberta Edmonton (UoA) was launched in October of 2022. The project considers the potential effects of emerging commodity transport demands in support of Canadian Net Zero 2050. The project seeks a deeper understanding of the mechanisms that govern the long-term fatigue behavior of spiral welded pipelines towards informing maintenance scheduling and design. Multi-scale testing and modelling approaches involving materials, fluids, and their interactions are to be pursued. Methodologies developed and knowledge gained have cross-over applicability to seamless and long-seam welded pipe. Recent full-scale pipeline fatigue testing for various geometric deformations was found to be sufficient to develop preliminary governing S-N curves for pipeline steels in air. A projection of a governing S-N curve family for pipeline steels which are subject to diffusible hydrogen is baselined through correlation with testing under diffusible hydrogen conditions. Full-scale fatigue tests of stress concentrators in carrier pipe steels indicate that a large percentage of the useful fatigue life consists of the crack initiation portion of the life cycle and may be leveraged in making integrity management decisions. Finally, in this work, the governing S-N curve is resolved into a safe-life plot versus the spectrum severity indicator cycles. This allows operators to project a practical lower bound safe life horizon for line pipe with typical stress concentrators. The study concludes that a multi-year project remains a prudent approach in the event some pipeline operators begin hydrogen or CO2 transport service before the project concludes in 2026.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".