Combustible dust is a serious and often underestimated hazard in industrial facilities. New NFPA standards are changing the way facilities must approach dust hazard analysis (DHA) and explosion protection — and the window to comply is narrowing.
"Under NFPA 652, facilities that handle combustible dust are required to complete a Dust Hazard Analysis and document the findings — with reviews required every five years."
What is Combustible Dust?
Combustible dust refers to fine particles that, when suspended in air at sufficient concentrations, can ignite and cause a deflagration or explosion. Common sources include:
- Agricultural products — grain, flour, sugar, starch
- Wood and paper dust
- Plastics and rubber
- Metals — aluminum, magnesium
- Coal and other carbonaceous materials
Proper dust collection and containment systems are the first line of defense against combustible dust hazards.
Updated NFPA Standards
The National Fire Protection Association (NFPA) has updated several standards that directly impact bulk solids processors:
- NFPA 652 — Standard on the Fundamentals of Combustible Dust: Requires facilities to conduct a Dust Hazard Analysis (DHA) for all processes that generate, handle, or store combustible dust.
- NFPA 61 — Standard for the Prevention of Fires and Dust Explosions in Agricultural and Food Processing Facilities.
- NFPA 654 — Standard for the Prevention of Fire and Dust Explosions from the Manufacturing, Processing, and Handling of Combustible Particulate Solids.
Dust Hazard Analysis (DHA)
A DHA is a systematic review of a facility's processes to identify combustible dust hazards and assess the risk of fire, deflagration, or explosion. Under NFPA 652, facilities that handle combustible dust are required to complete a DHA and document the findings.
The DHA must be reviewed and updated every five years, or whenever a process change occurs that could affect the dust hazard profile.
Explosion Protection Strategies
Once hazards are identified, facilities must implement appropriate protection measures, which may include:
- Explosion venting and suppression systems
- Isolation devices to prevent flame propagation
- Dust collection and housekeeping programs
- Grounding and bonding to prevent static discharge
- Deflagration-resistant equipment and enclosures
How Tennant Specs Can Help
Tennant Specs represents manufacturers with proven solutions for combustible dust hazard mitigation, including dust collection systems, explosion venting, and containment equipment. Our sales engineers can help you assess your facility's risk profile and identify the right combination of equipment and controls.
Don't wait for an incident — contact Tennant Specs today to discuss your combustible dust safety program.
