2019 Editions of NFPA 652 and NFPA 484 Standards on Combustible Dust Include Significant Changes
August 24, 2018
The National Fire Protection Association (NFPA) has just released the 2019 editions of NFPA 652 Standard on Fundamentals of Combustible Dust and NFPA 484 Standard for Combustible Metals.


NFPA 652 (www.nfpa.org/652) was developed three years ago to place the fundamental requirements for combustible dust fire and explosion safety in one standard. This standard included the retroactive requirement for a Dust Hazard Analysis (DHA) to be performed for all operations that generate, process, handle or store combustible dusts or particulate solids.

NFPA 484 (www.nfpa.org/484specifically addresses facilities generating or handling combustible metal dusts and powders. There exist many significant differences between NFPA 484 and the other NFPA combustible dust standards due to the unique properties of metal dusts.

What to Expect

The original NFPA 652 standard set a deadline for performing a DHA of September 7, 2018, which has now been extended to September 7, 2020. The new version of NFPA 652 also includes new requirements for a variety of different types of process equipment.

Major revisions in NFPA 484 Standard for Combustible Metals include consolidating common requirements for different metals and adding flexibility to the types of dust collection systems and protection methods that can be used with combustible metals. Additionally, specific chapters were added to cover the emerging fields of nanometals and additive manufacturing (3D Printing).

How Exponent Can Help

Our consultants have significant experience with evaluating combustible dust hazards, and a number of them are members of the NFPA committees responsible for standards preventing and mitigating dust explosions. This experience allows them to assist facilities in understanding and complying with applicable combustible standards, including the new editions of NFPA 652 and NFPA 484. Exponent engineeers are members of NFPA technical committees associated with the following standards:

  • NFPA 61 Standard for the Prevention of Fires and Dust Explosions in Agricultural and Food Processing Facilities – Tim Myers, James Karnesky 
  • NFPA 68 Standard on Explosion Protection by Deflagration Venting – Alfonso Ibarreta, Tim Myers 
  • NFPA 69 Standard on Explosion Prevention Systems – Alfonso Ibarreta, Tim Myers 
  • NFPA 484 Standard for Combustible Metals – Tim Myers, James Vickery 
  • NFPA 499 Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas – Tim Myers, Michael Stern 
  • NFPA 652 Standard on Fundamentals of Combustible Dust – Tim Myers, Michael Stern
  • NFPA 654 Standard for the Prevention of Fire and Dust Explosions from the Manufacturing, Processing, and Handling of Combustible Particulate Solids – Ali Reza 
  • NFPA 655 Standard for the Prevention of Sulfur Fires and Explosions – Ali Reza 
  • NFPA 664 Standard of Fires and Explosions in Wood Processing and Woodworking Facilities – Tim Myers