As we come back into the office after having a few days off due to a snowstorm there is an important issue that is highlighted by the recent cold weather. When the temperature decreases, the danger of a combustible dust explosion increases during these winter months. A study by the U.S. Chemical Safety Board found that seven out of the eight deadly dust explosions between 1995 and 2009 were during cold winter months.
What is it about cold weather that makes it more likely for a deadly dust explosion to occur?
Low Humidity Levels
In the winter humidity levels are lower in general simply because cold air holds less moisture in it than warmer air. Buildings that use a forced air heating system make the air humidity even lower by burning out any water vapor that did remain in the cold air. When the humidity is lower it makes it easier for these hazardous dusts to disperse in the air, and can lower the temperature needed for ignition.
Lack of Ventilation
When the heating system is running during the winter the occupants of the building will be sure to keep doors and windows closed to conserve this heat. In warmer weather these bay doors or building windows might be opened to let in fresh air, or there will be fans running to maintain airflow inside the building. This extra airflow can keep dust levels from becoming too high to become hazardous, but the lack of extra ventilation in the winter can let dust levels increase.
Change in Cleaning Practices
Many common housekeeping practices in manufacturing facilities rely on water, but when temperatures drop too low cleaning with water can’t be used. This causes either the dust to accumulate until warmer weather when water-based cleaning can be used again, or other cleaning techniques that can be dangerous for combustible dust are used. Often, people will try to use compressed air to clean combustible dust in an area that previously used a water-based cleaning. However, this just results in a dust cloud, creating a dangerous situation for everyone involved.
Is this cold weather creating a deadly dust explosion risk in your building?
Contact a Hughes Environmental representative to learn how we can help you avoid fire & explosion hazards.
