Liquid hydrogen storage for hydrogen refuelling stations: codes and standards gap analysis
Bibliographic record
Abstract
The project examines the adoption of liquid hydrogen (LH2) as a low-pressure storage solution at hydrogen refuelling stations in Canada, addressing its higher density and associated hazards. LH2 requires specific handling and equipment due to its unique properties like low boiling point and high thermal expansion. The project identifies roadblocks such as outdated codes and standards, focusing on components like storage tanks, vaporizers, and pumps. It highlights existing standards from NFPA, CGA, ISO, and the need for harmonization with USA and international standards. Feedback from stakeholders suggests gaps in Canadian standards, emphasizing the need for development and harmonization. Recommendations include continued review, development of Canadian standards, streamlined approval processes, and risk assessments. Harmonizing standards across provinces and incorporating international standards could facilitate exports and improve safety measures. The CAN/BNQ 1784-000/2022 requires updates to align with NFPA 2, and risk assessments should be conducted with industry collaboration.
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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 | 0.016 | 0.034 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.008 | 0.013 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.005 | 0.003 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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".