Figure 1
Combined Topic Ranking.
| Air Liquide | Karlsruhe Institute of Technology |
| Air Products | Kawasaki Heavy Industries |
| Ballard Power Systems Europe | Korea Gas Safety |
| Bureau Veritas | Norwegian University of Science and Technology (NTNU) |
| Canadian Nuclear Laboratory | Shell |
| Compressed Gas Association (US) | Surrey University |
| Cummins Inc | Technical University of Denmark (DTU) |
| Danish Gas Technology Centre | Thorton Tomasetti |
| Engie | US Department of Energy |
| European Industrial Gases Association | UK Health and Safety Executive |
| Forschungszentrum Jülich | University of Bergen |
| French National Centre for Scientific Research (CNRS) | University of Maryland |
| French National Institute for Industrial Environment and Risks (INERIS) | University of Stavanger |
| German Aerospace Center (DLR) | US National Renewable Energy Laboratory (NREL) |
| German Federal Institute for Materials Research and Testing (BAM) | US Sandia National Laboratories |
| Global Decarbonisation Advisory | World Steel Association |
| Helixos | Yokohama National University |
| Hydrogen Council | Zero Carbon Energy Solutions |
Table 1
Combined Transportation and Storage Ranking.
| SUBTOPICS | VOTES |
|---|---|
| Pipeline Transportation | 24 |
| Cavitation in LH2 Tanks | 11 |
| Substitutes for LH2 | 10 |
| Industrial Scale Storage | 31 |
| LH2 Pipe Hazard Classification | 21 |
Figure 2
Combined Transportation and Storage Ranking.
Figure 3
Non-Industry Transportation and Storage Ranking.
Figure 4
Industry Transportation and Storage Ranking.
Table 2
Combined Ignition Phenomena Ranking.
| SUBTOPIC | VOTES |
|---|---|
| Ignition Probabilities | 24 |
| Immediate/Delayed Ignition | 23 |
| Spontaneous Ignition | 10 |
| Cryogenic Ignition | 22 |
| Ignition Mechanisms | 22 |
Figure 5
Combined Ignition Phenomena Ranking.
Figure 6
Non-Industry Ignition Phenomena Ranking.
Figure 7
Industry Ignition Phenomena Ranking.
Table 3
Combined Mitigation, Sensors, and Hazard Prevention Ranking.
| SUBTOPIC | VOTES |
|---|---|
| Severity Criteria for Hazards | 13 |
| Ventilation Design | 13 |
| Mitigation Measures | 11 |
| In-Line Monitoring | 12 |
| Ammonia Mitigation | 6 |
| Hazard Area Classification | 15 |
| Leak Detection and Surveillance | 31 |
Figure 8
Combined Mitigation, Sensors, and Hazard Prevention Ranking.
Figure 9
Non-Industry Mitigation, Sensors, and Hazard Prevention Ranking.
Figure 10
Industry Mitigation, Sensors, and Hazard Prevention Ranking.
Table 4
Combined Regulations, Codes, and Standards Ranking.
| SUBTOPIC | VOTES |
|---|---|
| Best Practices | 23 |
| New Industry Standards | 20 |
| QRA in Standards | 21 |
| LH2 Standards | 27 |
| Aerospace Standards | 10 |
Figure 11
Combined Regulations, Codes, and Standards Ranking.
Figure 12
Non-Industry Regulations, Codes, and Standards Ranking.
Figure 13
Industry Regulations, Codes, and Standards Ranking.
Table 5
Combined Phenomena Understanding and Modelling Ranking.
| SUBTOPIC | VOTES |
|---|---|
| DDT Sensitivity | 9 |
| Chemical Inhibition | 5 |
| Hybrid Mixtures | 10 |
| Gas Explosion Modelling | 21 |
| Critical Thermodynamics | 4 |
| Vapour Cloud Explosion | 16 |
| Impinging Jets | 12 |
| Benchmark Studies | 10 |
| H2 Derivatives | 5 |
| Jet Explosions | 11 |
Figure 14
Combined Phenomena Understanding and Modelling Ranking. Please note that Chemical Inhibition, Critical Thermodynamics, and H2 Derivatives have been hidden from the figure.
Figure 15
Non-Industry Phenomena Understanding and Modelling Ranking. Please note that Chemical Inhibition, Critical Thermodynamics, and H2 Derivatives have been hidden from the figure.
Figure 16
Industry Phenomena Understanding and Modelling Ranking. Please note that Chemical Inhibition, Critical Thermodynamics, and H2 Derivatives have been hidden from the figure.
Table 6
Combined QRA and Reliability Data Ranking.
| SUBTOPIC | VOTES |
|---|---|
| Uncertainty in Risk Models | 14 |
| Indoor Hydrogen QRA | 6 |
| Reduced Order Models | 3 |
| Failure Rate Data | 20 |
| Electrolyser Risk Analysis | 12 |
| Component Reliability | 3 |
| Integrity Monitoring | 4 |
| Nuclear Coupled Hydrogen | 3 |
| System Design | 13 |
| Reliability Database | 14 |
| Testing Labs | 1 |
| Risk Model Development | 8 |
Figure 17
Combined QRA and Reliability Data Ranking. Please note that Reduced Order Models, Component Reliability, Integrity Monitoring, Nuclear Coupled Hydrogen, and Testing Labs, have been hidden from the figure.
Figure 18
Non-Industry QRA and Reliability Data Ranking. Please note that Reduced Order Models, Component Reliability, Integrity Monitoring, Nuclear Coupled Hydrogen, and Testing Labs, have been hidden from the figure.
Figure 19
Industry QRA and Reliability Data Ranking. Please note that Reduced Order Models, Component Reliability, Integrity Monitoring, Nuclear Coupled Hydrogen, and Testing Labs, have been hidden from the figure.
Table 7
Combined Cryogenic Hydrogen Ranking.
| SUBTOPIC | VOTES |
|---|---|
| LH2 Modelling Tools | 21 |
| Flame Acceleration in LH2 | 5 |
| Sensor Placement | 11 |
| Ventilation Strategies | 7 |
| LH2 Releases | 15 |
| LH2 Concentration | 6 |
| Impinging Jet Flames | 2 |
| Cryogenic LH2 Safety | 7 |
| Cryogenic H2 Behaviours | 6 |
| BLEVE Risk | 18 |
Figure 20
Combined Cryogenic Hydrogen Ranking. Please note that Flame Acceleration in LH2 and Impinging Jet Flames have been hidden from the figure.
Figure 21
Non-Industry Cryogenic Hydrogen Ranking. Please note that Flame Acceleration in LH2 and Impinging Jet Flames have been hidden from the graph.
Figure 22
Industry Cryogenic Hydrogen Ranking. Please note that Flame Acceleration in LH2 and Impinging Jet Flames have been hidden from the figure.
Table 8
Combined Safe Design Ranking.
| SUBTOPIC | VOTES |
|---|---|
| Material Assessment | 19 |
| Non-Metallic Vessels | 12 |
| Structural Design | 5 |
| Inherently Safe Design | 26 |
| Na-Tech | 1 |
| Laboratory Safety | 6 |
| Vent Design | 22 |
Figure 23
Combined Safe Design Ranking.
Figure 24
Non-Industry Safe Design Ranking.
Figure 25
Industry Safe Design Ranking.
Table 9
Combined Stakeholder and Public Perception Ranking.
| SUBTOPIC | VOTES |
|---|---|
| Education on H2 Safety | 28 |
| Public Perception of H2 | 13 |
| Risk Awareness, Perception, and Preferences for Stakeholders | 21 |
| Public Perception of H2 Safety | 19 |
| Communication Strategies | 19 |
Figure 26
Combined Stakeholder and Public Perception Ranking.
Figure 27
Non-Industry Stakeholder and Public Perception Ranking.
Figure 28
Industry Stakeholder and Public Perception Ranking.
Table 10
Combined Topic Ranking.
| TOPIC | POINTS |
|---|---|
| Transportation and Storage | 87 |
| Ignition Phenomena | 148 |
| Mitigation, Sensors, and Hazard Prevention | 176 |
| Regulation, Codes, and Standards | 153 |
| Phenomena Understanding and Modelling | 154 |
| QRA and Reliability Data | 197 |
| Cryogenic H2 | 131 |
| Safe Design | 135 |
| Stakeholder and Public Perception | 97 |
Figure 29
Combined Topic Ranking.
Table 11
Non-Industry Topic Ranking.
| TOPIC | POINTS |
|---|---|
| Transportation and Storage | 40 |
| Ignition Phenomena | 94 |
| Mitigation, Sensors, and Hazard Prevention | 120 |
| Regulation, Codes, and Standards | 78 |
| Phenomena Understanding and Modelling | 103 |
| QRA and Reliability Data | 125 |
| Cryogenic H2 | 75 |
| Safe Design | 55 |
| Stakeholder and Public Perception | 66 |
Figure 30
Non-Industry Topic Ranking.
Table 12
Industry Topic Ranking.
| TOPIC | POINTS |
|---|---|
| Transportation and Storage | 47 |
| Ignition Phenomena | 54 |
| Mitigation, Sensors, and Hazard Prevention | 56 |
| Regulation, Codes, and Standards | 75 |
| Phenomena Understanding and Modelling | 51 |
| QRA and Reliability Data | 72 |
| Cryogenic H2 | 56 |
| Safe Design | 80 |
| Stakeholder and Public Perception | 31 |
Figure 31
Industry Topic Ranking.
Figure 32
Priorities matrix with applications from production to usage in rows and phenomena and tools in different columns (highest priority in red, via orange and yellow to lowest in green).