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Hazards Analysis, Miscellaneous

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Hazards Analysis, Miscellaneous

This is an interesting question because of the special considerations associated with the H2-air mixture flashback scenario during turbine startup and shutdown. In-line deflagration arresters and detonation arresters for H2-air mixtures are different than those for most other fuels and need to be certified for use with hydrogen. They are commercially available, and NFPA 69 has a good chapter…

Category: Miscellaneous

LNG storage, plumbing, and other systems can’t be directly retrofitted to handle hydrogen. The LNG components and systems will need to be removed and replaced with equipment specifically designed for hydrogen. If the concept is to convert existing equipment or an existing ship, then it’s probably impossible. If it’s to convert an existing LNG design on paper, then it’s probably impractical.…

Category: Miscellaneous

It is common to have combustible materials and fuels in a building during construction activities. Commissioning is typically considered part of construction. It is good to see that fire suppression is available. However, given the lack of alarm capabilities, it would seem prudent to have a fire watch posted when hazardous materials are present or being used. Regarding requirements, the…

Category: Miscellaneous
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Flammable hydrogen releases can result in deflagration and transition to a detonation. Whether the
deflagration transitions to a detonation depends on numerous parameters such as cloud size, hydrogen
concentration, confinement, and congestion. Releases into confined or congested areas are more
susceptible to generating significant deflagration over-pressures and more likely to…

There are numerous models that can be used to assess the consequence and risk of leaks and releases.
One such model is HYRAM which is publicly available from Sandia and the US DOE.

Emergency response procedures must be developed for each system based on its design. The
procedures generally include steps to clear personnel from the immediate area, isolate the hydrogen,
shut down the equipment, contact local responders, and protect surrounding equipment/structures until
the hazard is mitigated or the incident is over.

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