Dust Hazards Analysis (DHA)


NFPA standards say, “Where dusts are determined to be combustible or explosible, the hazards associated with the dusts shall be assessed and mitigated.”

The DHA is a hazards assessment and mitigation process that helps your company identify and address all relevant hazards, evaluate scenarios that can potentially lead to dust or fire explosions, and the corrective actions required to address those consequences. The DHA is a critical step in the mitigation of combustible dust risks and provides a basis for the implementation of other requirements such as engineering controls, operating procedures, training, inspection and testing programs, and management of change programs.

Our DHA process includes 3 phases: 

  • PHASE I – Process Review and Data Collection 
    Lewellyn’s combustible dust, safety and health consultants will collect and review information such as, but not limited to, combustible dust testing data, Safety Data Sheets (SDSs), safety and health programs, and other applicable information. Lewellyn will use this information in conjunction with an on-site audit of the facility to analyze all the processes and equipment located throughout the facility, with a heavy emphasis on the dust handling and generating areas.
  • PHASE II – Dust Hazard Analysis (DHA)
    Lewellyn will analyze the processes and related information to evaluate the facility’s current level of compliance with applicable combustible dust, safety and health standards, as well as potential fire and explosion hazard scenarios associated with the combustible dusts. Lewellyn will also ensure that proposed fire and explosion risk mitigation strategies are both safe and compliant with NFPA 652 and other NFPA and OSHA standards. The process will conclude with a preliminary high-level discussion of observations. All observations identified as immediately dangerous to life and health will be addressed at the time they are discovered.
  • PHASE III – Final DHA Report and Recommendations
    Lewellyn will prepare a detailed report in this phase. The report will not only explain the combustible dust hazards that are identified during the DHA, but also identify practices that are not in compliance with the applicable OSHA, NFPA, and other combustible dust, safety and health standards. The report will also propose specific corrective actions to mitigate any combustible dust hazards identified through the DHA. The proposed corrective actions will be prioritized based on the severity and probability of the hazard. After the report has been issued, Lewellyn will assist with any questions or issues arising from the DHA.

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The Dust Hazards Analysis (DHA) is also called a Process Hazards Analysis (PHA).

Several NFPA standards including NFPA 61, NPFA 68, NFPA 69, NFPA 484, NFPA 654 and NFPA 664 require a thoroughly documented DHA or PHA. OSHA’s Process Safety Management Standard (29 CFR 1910.119) also requires employers to perform a thorough PHA on all applicable processes that are covered under the standard.

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