The three-year HyTunnel CS project culminated in the report titled Deliverable D6.9, “Recommendations for inherently safer use of hydrogen vehicles in underground traffic systems.” The HyTunnel CS project aimed to perform pre-normative research for the safety of hydrogen-fueled vehicles traveling through tunnels or entering confined spaces. The main objective was to compare the relative risk of hydrogen vehicles entering underground traffic systems to existing fossil fuel-powered vehicles [1].

The information in this document provides answers to the questions that were raised during the Center for Hydrogen Safety September 4, 2023 webinar.

The information in this document provides answers to the questions that were raised during the Center for Hydrogen Safety February 7, 2023 webinar.

The information in this document provides answers to the questions that were raised during the Center for Hydrogen Safety April 27, 2023 webinar. The Q&As are sorted by topic with the question number for reference. The Q&As are sorted by topic with the question number for reference. Redundant questions were deleted from the original list.

Several codes require excess flow valves in pipelines so that in the case of line rupture, the flow will be shut off.   In theory, this is a good idea, however, in practicality, it has many limitations.  The sizing and practical uses make the sizing difficult if sometimes impossible, depending on the design parameters.   

Hydrogen is a key energy carrier for modern society. The breaking of the hydrogen bonds within traditional hydrocarbon molecules has been the primary mode of energy utilization since the industrial revolution. An increased focus on “net-zero” greenhouse gas emissions, specifically carbon dioxide and methane, has resulted in a global push for lower carbon energy vectors, including pure hydrogen.

An under-expanded hydrogen jet from high-pressure equipment or storage tank is a potential incident scenario. Experiments demonstrated that the delayed ignition of a highly turbulent under-expanded hydrogen jet generates a blast wave able to harm people and damage property. There is a need for engineering tools to predict the pressure effects during such incidents to define hazard distances. The similitude analysis is applied to build a correlation using available experimental data.

The adoption of hydrogen (H²) as a clean, zero-carbon renewable energy source promises a global revolution, eliminating harmful emissions responsible for climate change. This white paper explores the opportunities and implications of an emerging hydrogen society. MSA Safety examines workplace safety risks and challenges posed when producing, handling, transporting, and storing alongside suggested best practices, safety measures, and detection technologies.

Contents 1 Climate Change Policy Objective 2 Hydrogen Flexibility 3 Hydrogen Production and Sources4 Hydrogen Properties5 Hydrogen Safety Codes and Standards Overview6 UK Hydrogen Blending Demo Approval7 US Hydrogen Blending Concept8 Pipeline Integrity9 Gas Composition Standards10 Pipeline Standards11 Hydrogen Safety Utilization 12 Conclusion 

This document applies to the recovery phase of a typical emergency management framework that includes planning, response, mitigation, and recovery. This document provides practical guidance with a checklist to help an organization recover from a hydrogen incident and return to normal operations after the event scene has been stabilized and returned to the organization by the incident commander. This document does not include activities related to the immediate emergency response and initial investigations performed by other entities.