How To Avoid An NFPA Dust Explosion

How To Avoid An NFPA Dust Explosion

As a manufacturing facility, your facility’s winter cleaning plan is just as important as your facility’s summer cleaning plan. In fact, according to the Chemical Safety Board, winter months create an increased risk of combustible dust fires and combustible dust explosions. But what is a NFPA dust explosion and how can you prevent it?

According to the National Fire Protection Association (NFPA) 654 defines combustible dust as “A combustible particulate solid that presents a fire or deflagration hazard when suspended in air or some other oxidizing medium over a range of concentrations, regardless of particle size or shape.”

For a fire to burn it needs three elements present simultaneously: Fuel, Ignition, and Oxygen – also known as the “Fire Triangle”. But for a combustible dust explosion, two additional elements are needed to form what is known as the “Dust Explosion Pentagon”.  These two elements are Confinement and Dispersion. They are created when the fuel, in this case combustible dust, is spread out as a dust cloud within a closed area, such as a factory or warehouse. However, taking away even one of these elements can remove the risk of a dust explosion; however the risk for a fire can still be present. Then, what elements of the dust explosion pentagon can be removed to prevent dust explosions?

 

Dust (Fuel)

Proper combustible dust cleaning is one of the most effective ways to prevent a dust explosion. By taking away the fuel from the dust explosion pentagon it removes the risk of an explosion, and also removes the possibility for a fire. The NFPA combustible dust standards outline the best methods for cleaning this dust, which should only be done by a trained professional.

 

Ignition (heat, spark, etc.)

This element can be contained to some extent by removing any open flames or potential for sparks to be created. It is also important to make sure machinery is clean and not getting too hot when it is operating. However, it is next to impossible to completely remove the risk for an ignition since it can be caused by such varied sources.

 

Oxidant

Since oxygen is a component of air and is necessary for workers to breathe it is the hardest element to remove from the explosion pentagon.

 

Confinement

This is another difficult element of the dust explosion pentagon to control, since working in a facility means it has to be a closed area. Environmental issues prevent manufacturers from releasing accumulated dust into the outside air, which means it stays confined inside the building.

 

Dispersion

By cleaning any accumulated dust, you are preventing the possibility of this element from being dispersed into the air, which ultimately removes it from even becoming a part of the dust explosion pentagon. Having the facility professionally cleaned by people following NFPA combustible dust protocols is an essential step in preventing a disaster.

 

Many of these sources are preventable with routine maintenance and fire safety procedures. Keeping machinery properly maintained and cleaned will prevent it from sparking during operation, which is the largest cause of explosions. Just think- if one of your machines isn’t greased properly it could spark and cause an explosion that destroys your entire factory.

Other problem areas that could be prevented include friction, static electricity, and electrical equipment. Steps can be taken to ease frictions points, dissipate static electricity, and ground electrical equipment, but sometimes the risk from these ignition sources isn’t able to be completely prevented. In these cases it is essential that the combustible dust be removed from the area, so that even if one of these ignition sources is created it doesn’t have anything larger to ignite.

 

For more information about how you can avoid a NFPA dust explosion in your facility, Contact Us Here or call us at 888-845-3952