From my friend, Brian Edwards, whom I have found to have great wisdom when dealing with combustible dust challenges.
Conversion Technology engineers to wear FRC when conducting Combustible Dust Hazard Analysis
Flame resistant clothing (FRC) has been used for years in a number of industries to protect workers from flash fires, arc flash, embers, molten metal, and other potential sources of ignition to clothing. The reason FRC is so important is that many fatalities have occurred because a worker’s clothing has caught on fire, exposing him/her to burning heat for a much longer time than would have occurred during the initial event (e.g. arc flash, vapor flash fire).
When looking at burn victims, there is a “magic” number – well, more accurately, a statistically relevant number – that predicts if the victim has a better chance of surviving … or dying. This number is 50%. Meaning, when the percent of a person’s body with 2nd or 3rd degree burns exceeds 50%, it is more likely that he will not survive. FRC is extremely valuable in minimizing the percentage of 2nd/3rd degree burns for a person exposed to a flash fire or other short duration thermal exposure (less than 3-4 seconds). It does this not by providing insulation, rather, FRC resists catching on fire and becoming a source of burns itself.
As I mentioned earlier, a number of industries have adopted FRC as standard issue clothing – think petroleum refining and steel mills. One area where the need for FRC has become more apparent is for workers potentially exposed to combustible dust flash fires. When combustible dust is suspended in air in sufficient concentrations, and there is a source of ignition, a flash fire very similar to that of a vapor fire can occur. Workers in the vicinity can be exposed to both the initial event, but they also stand the risk of having their clothing ignite. Because of this, NFPA 654 – Standard for the Prevention of Fire and Dust Explosions from the Manufacturing, Processing, and Handling of Combustible Particulate Solids – now details the need for considering FRC as part of the hazard analysis conducted for an industrial plant where combustible dust is present.
At Conversion Technology, Inc. (CTI), our safety and environmental engineers have long wore FRC when it was required by our client’s facility. However, we have noticed that a large percentage of industrial facilities with potential combustible dust hazards have not considered FRC in their Personal Protective Equipment (PPE) hazard assessment. Therefore, we have decided that regardless of the Client’s requirements, we will require all engineers conducting combustible dust hazard assessments to wear FRC while on site.
Not all facilities who process and handle combustible dust will need to require FRC. Part of CTI’s scope of work while conducting a combustible dust hazard assessment is to determine whether or not FRC is needed. However, until we have made that determination, our engineers will not know if they will be walking into an area where they are potential exposed to a dust fire hazard. This unknown is why we have made this decision.
We hope that all facilities that handle and process combustible dust will make the effort to determine if workers are potential exposed to combustible dust fire and explosion hazards. Conversion Technology is available to help those that need assistance in making this determination.