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30 Set 2020

NFPA 652: Dust Hazard Analysis

What has changed? What do you need to know?

New mandatory regulation in the USA

The 2016 revision to NFPA 652 made Dust Hazard Analysis (DHA) mandatory for all businesses creating, handling or transferring explosive dusts in the USA. The deadline for completing a DHA was September 7, 2020. This legal requirement is enforced by OSHA. If you have not yet completed a DHA, you are liable to fines or worse from OSHA and other regulatory bodies.

What is a DHA?

NFPA 652 defines a Dust Hazard Analysis (DHA) as “a systematic review to identify and evaluate the potential fire, flash fire or explosion hazards
associated with the presence of one or more combustible particulate solids in a process or facility.” It is only the review must be completed by September 7. Any recommendations coming out of it can be completed after that date. A common recommendation is to verify that existing explosion
panels are designed per NFPA 68.


NFPA 68 is the standard on explosion protection by deflagration venting. It covers the design, location, installation, maintenance, and use of devices and systems that vent the combustion gases and pressures resulting from a deflagration within an enclosure so that structural and mechanical damage
is minimized.

NFPA 68 requires that you keep accurate records and conduct regular maintenance, training and inspection exercises:

  • Documentation: NFPA 68 lists 19 documents that you must keep on record
  • Inspection: Vent closures must be inspected at least annually. The inspection process consists of 16 steps, detailed in NFPA 68.
  • Maintenance: A maintenance plan must provide for maintenance of the vent closures following an upset, act of nature, or turnaround.
  • Training: All employees operating, maintaining or supervising facilities must be trained.
  • Record-keeping: You must keep all records for a minimum of three years.

Oseco-Elfab can help you meet your NFPA 68 requirements in order to comply with NFPA 562. We offer support with inventory management, provide expert engineering advice and offer a vent-sizing worksheet.

The Oseco MV family of explosion vents meet the OSHA and NFPA 68 requirements and offer industry-leading performance tolerances.