Another minor combustible dust fire in the news with no injuries or fatalities. That is the good news..Yet stakeholders need to be aware that besides hot surfaces, arcs, sparks, static electricity, etc (process situations) that can ignite combustible dust, so can process upsets such as the case in this incident.

"combination of water and molten steel can cause a flash-up. That flash of fire likely set dust on fire, which then spread to a nearby storage room." (Watch the video)

WTOL-news article

OSHA is in the rulemaking process for a combustible dust regulation that is a continuum of the OSHA Combustible Dust National Emphasis Program (NEP). The primary problem with this approach, is that it solely notes specific national industries (NAICS)  that supposedly have a high probability or high consequence or potential for combustible dust incidents and ignoring others with potential fire/explosion hazards. Now for the bad news.. According to media account, over 50% of combustible dust related fires and explosions occur in national industries (NAICS) not listed in the the OSHA ComDust NEP, such as the case with this incident

For example, the real eye opener concerning this minor incident, is that this facility is an iron and steel mill national industry (NAICS 331111), which is not acknowledged in the OSHA Dust NEP as having high probability/consequence or potential for combustible dust incidents. So if the tree fell in the forest and no one heard it, did it fall?

There are dozens of other national industries composed of thousands of facilities in the wood, paper, plastic, metal, chemical, and food manufacturing sectors not listed in the OSHA ComDust NEP that have regular occurring minor combustible related dust fires which don't get notice from many other stakeholders either. This attitude is attributed to normalization of deviation as what occurred in the events leading up to the 1986 Space Shuttle Challenger disaster. Same thing with a catastrophic dust explosion as it is a rare event also.

It is time to face reality and get with the program, understanding the ComDust fire/explosion problem is a process condition (equipment) issue and not solely a national industry (NAICS) subject. Whether an industry is listed in the OSHA ComDust NEP or not as a non-NEP NAICS, they all have similar process materials (combustible dust) and process situations (ignition sources). So how can we say that one national industry has high probability/consequence or potential for a combustible dust incident because it is listed yet another one doesn't because it is not listed in the NEP? Yet both industries generate combustible dust during the manufacturing process. This train of thought does not hold water as America is burning. Just remember that any minor combustible dust related fire is a failed catastrophic combustible dust explosion.

A problem arises in the national fire reporting system where there are no data elements specifically identifying manufacturing process equipment involved in ignition of combustible dust. If process condition fire hazards can't be identified, then how can they be properly evaluated and controlled through administrative, PPE and best engineering practices?

"Stakeholders seeking control measures to minimize the probability and severity of combustible dust incidents should work more closely with the fire service."

ohsonline.com

 

Informative article on the results of a research study on combustible dust related fires occurring in combine harvesters in the agricultural sector. The harvester diesel engine creates high temperatures resulting in very hot surfaces that can easily ignite the build-up of combustible dust that has low minimum ignition temperatures (MIT).
Stock & Land/Fairfax Media

The entire manufacturing sector can learn from this study as the process situations (ignition sources) of hot surfaces and static electricity can ignite combustible dust at facilities just like that do on a combine harvester. Good housekeeping is essential in minimizing the probability of occurrence in either case.

Fire Chief states, "It's the nature of the business." "Part of the problem is the nature of the process that's there. It lends itself to having a fire to begin with. And it's not their fault" Caledon Enterprise

Grain elevator had prior explosion in 2008 which caused much more damage and a worker injury. CEO notes that explosion protection best engineering practices lessened the severity of this recent explosion. This incident is a prime example of how ComDust incidents will continue to occur and only the probability and severity can be reduced through PPE, best engineering, and administrative controls.

"It's believed a spark from the machinery inside the hopper ignited the blaze, which is burning in the feed residue that had been encrusted along the walls of the bin." Prior fire several days earlier causing an estimated $20,000 damage.Winnipeg Free Press

Many other manufacturing facilities have similiar process situations (ignition sources) where either a spark or spontaneous ignition can ignite the process materials causing a combustible dust related fire. Good housekeeping and maintenance is essential in removing the buildup of combustible dust or residue. Without the fuel, a combustible dust related fire will not occur.