FAQ CATEGORY: DHA

A Dust Hazard Analysis is a systematic review used to identify and evaluate fire, flash fire and explosion hazards associated with combustible dust in a facility. It examines materials, processes and conditions that could lead to an incident. A thorough DHA evaluates multiple elements including material characteristics, process conditions and hazard mitigation strategies to create a clear and actionable safety plan.

You cannot determine whether a dust is combustible based on appearance alone. If your facility generates dust from materials like metals, wood, chemicals, plastics, food, paper or other organic solids, dust testing and material characterization provide the data needed to support a proper Dust Hazard Analysis (DHA) and determine the right risk reduction strategies for your operation.

This testing evaluates key explosibility metrics, including the Kst value (which indicates how quickly a dust explosion can develop) and Pmax (the maximum pressure generated during an explosion). Together, these indices help classify the severity of a potential dust explosion and inform appropriate safety measures.

Facilities that manufacture, process or handle combustible dust are required to conduct a DHA under NFPA 660, the consolidated standard for combustible dust safety. Requirements depend on the materials and processes involved. Even if a facility is unsure whether it falls under specific requirements, completing a DHA is considered a best practice for identifying and managing potential risks.

A DHA is conducted by qualified professionals with expertise in combustible dust hazards and applicable standards. Supporting services, such as dust testing and system evaluation, may involve additional specialists. Working with experienced partners helps ensure the analysis is accurate, thorough and aligned with real-world operating conditions.

A DHA requires detailed information about materials, dust properties, process flows, equipment and facility layout. Accurate data is critical for identifying hazards and developing effective recommendations. This often includes dust testing results, process documentation and an understanding of how dust moves and accumulates throughout the facility.

A DHA should be reviewed and updated periodically, especially when processes, materials or facility conditions change. It is considered an ongoing component of a facility’s safety strategy, not a one-time exercise. Regular updates help ensure that new risks are identified and that existing controls remain effective over time.