FAQ
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Category

Detectors, Hazards Analysis

Category

Detectors, Hazards Analysis
What guidance is available for addressing issues with LEL sensor reliability when commissioning a regenerative thermal oxidizer? The project in question uses hydrogen gas along with some volatile organic compounds mixed at approximately 1-2% by volume in air. The flow is under slight vacuum at -8 water column in an 8” pipe. The sensor needs to be able to detect at least two levels of hydrogen concentration (1.5% and 3.5%) to ensure the LEL is not exceeded. The project also wants to attach an alarm to the output from the sensor. The service is continuous monitoring, and a sensor that can last at least 6 months is desired. The project may consider a second system to enable change-out of sensors while running.

The answer will depend on if it is only H2 measured or if VOCs are also included. The type of gas sensor may change since many detectors are limited to flammable gases. To provide feedback, the Panel would require more details on the sensors being used on the project and the failure modes. There are concerns about allowing hydrogen concentrations as large as 3.5% for the high level alarm.…

Category: Detectors
Keywords: Detector, Sensor, Reliable
What are some important considerations when evaluating overtemperature scenarios for gaseous hydrogen fills of Type 4 cylinders?
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Will a flammable hydrogen/air cloud detonate? If so, under what conditions?

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…

Category: Hazards Analysis
Keywords: Detonation, Deflagration, Flammable Clouds
Are there simulation models for potential leaks from dispensers at stations?

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.

Category: Hazards Analysis
Keywords: Leak, Simulation Models, HYRAM, Risk Assessment
What are the emergency response procedures for a hydrogen-related incident?

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.

Category: Hazards Analysis
Keywords: Emergency Response
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The portal brings together and enhances the utility of a variety of tools and web-based content on the safety aspects of hydrogen and fuel cell technologies to help inform those tasked with designing, approving or using systems and facilities, as well as those responding to incidents.

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