When was the last time you responded to a hazmat call? Even if your department does not have a trained hazmat team, I’m guessing you have responded to one or more calls that have involved hazardous materials such as an overturned vehicle or tanker truck, a chemical emergency, or a meth lab fire.
Arriving on the scene of any one of these calls often forces firefighters to make decisions based on what they don’t see. Bring in a thermal imaging camera (TIC) and firefighters can now see what was previously invisible to the naked eye. Having this ability allows the firefighting crew to make better and safer decisions on the scene.
A TIC can be an invaluable tool for the hazmat firefighter. Having the ability to see the content level of an enclosed container at a safe distance is critical to the safety of the firefighting crew. Tracing a spill on the roadway in a rain storm is an environmental necessity. Seeing the gases of a container at a safe distance is critical to the safe outcome of a hazmat mission. More and more fire departments are being trained to answer hazmat calls, and the use of thermal imaging is another tool in their arsenal.
While a TIC cannot remove the hazardous materials at an incident, it can help firefighters locate and isolate the materials. Let’s look at how a TIC can help a firefighting crew at a hazmat incident.
Identifying a Land Spill
We have all responded to a scene where a vehicle was overturned and wondered if there were any materials leaking from that vehicle. Using a TIC in this situation allows the firefighter to detect the differences in temperature or emissivity (level of reflectivity) between the vehicle, its contents, and the ground surface around the incident. If the spilled material is a different temperature than the surface on which it is spilled and the material stays on the surface, it should be visible on the TIC.
If the product has already drained from its container prior to fire department arrival, a TIC can be used to identify the location of the contents that have leaked onto the surface. Be aware that there are factors that may influence how well a TIC will work in this situation, including the amount of product leaking or spilled, properties of the material, denseness of the vegetation where the spill has occurred, and the relative temperature difference between the spilled material and the surrounding environment.
Identifying a Water Spill
Using a TIC to identify a hazmat floating on a body of water can help firefighters identify where the material is entering the water supply and how much of the water supply has been contaminated. The differences in emissivity or temperature of the contaminant will allow the firefighter to see a visible difference on the TIC screen. It is important to note that only materials that weigh less than water can be identified using the TIC. A TIC cannot see through water.
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1 A thermal imaging camera is a critical tool in a firefighter’s arsenal when responding to a hazmat incident. (Photo courtesy of Bullard.) |
Identifying Product Levels in a Container
Materials in contact with the surface of a container can conduct heat through the walls of the container at a slower rate than the dead air space above the product. Unless the product was heated prior to being pl