Thermal Imaging & Incident Size-Up

Incident size-up is a critical first step that helps ensure firefighter safety as well as the successful conclusion of an incident. Effective and proficient use of a thermal imager (TI) during incident size-up requires several key points be incorporated...


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Incident size-up is a critical first step that helps ensure firefighter safety as well as the successful conclusion of an incident. Effective and proficient use of a thermal imager (TI) during incident size-up requires several key points be incorporated into regular training.

0304thermal1.jpg
Courtesy of Bullard
Figure 1. This image is a digital capture from a thermal imager. It shows the A side of a structure fire at a carpet retailer (right occupancy) with exposure to a restaurant (left occupancy). Heavy black and brown smoke is pushing from the carpet store’s door (side D). The building is a Type III structure, approximately 60 by 60 feet. The first-due engine and truck have just started operating and hydrants lines are being laid out. The weather: rain and 55 degrees Fahrenheit.

0304thermal2.jpg
Courtesy of Bullard
Figure 2. This image shows the key points in the size-up:
1. The roof is extremely hot, especially given the weather conditions. Heat has spread along the red curved line, showing that the fire is traveling above the drop ceiling and is working into the restaurant.
2. The hot windows at the carpet store show heavy heat inside the building. This has not spread completely into the restaurant. The windows are very white, down to about three to four feet above the ground, showing that the heat layer has dropped significantly.
3. Heat columns are pushing from the door on side D. The bright white below the heat columns could be fire hidden within the smoke.

For the TI to be of any use during size-up, it must actually come off the apparatus. In addition, the user must be comfortable carrying and using the TI. To ensure this happens in “real life” incidents, fire departments are advised to take the following steps:

1. The department’s standard operating guidelines (SOGs) must incorporate thermal imager use. The SOG should identify the person assigned the tool and specify that the TI will be taken off the apparatus at every scene. Do not limit use to only fires or to non-EMS runs. In most departments, working structure fires are 10% to 20% of their runs; 70% to 90% are EMS runs. Thermal imagers can help at certain EMS scenes, and regularly carrying the TI reinforces the habit.

2. The TI must be within easy reach of the assigned user. If the company officer is assigned the imager, the TI should be mounted near the officer’s seat. A TI in a compartment or a trunk is used rarely in size-up.

3. Most firefighters realize that how they train is how they will perform. During every training evolution, the assigned person must carry the TI. The user must be comfortable performing all of his or her normal tasks while carrying the imager. Climbing a ladder with a TI hanging from a self-contained breathing apparatus (SCBA) or draped over a shoulder can be frustrating if it is not practiced.

4. Standardize how the TI is carried. Many TIs are supplied with a carrying strap. Test this system and develop the most convenient method of using it that will satisfy the department’s operational needs. Make sure that other fireground tasks can be completed while carrying the imager.

Several drills can develop a user’s proficiency with a thermal imager. A key skill to gain is image interpretation, which requires very frequent use of the TI. Walk around the firehouse looking for odd or out-of-place heat sources. Discuss how and why the image appears as it does. At night, stand outside the firehouse and look at the neighborhood. Practice recognizing construction features; analyze the effects of the sun and weather on the image:

  • Are certain parts of a building hotter after a summer day?
  • Does a cold rain change the “normal” signature of the building across the street?

Consider the effects of building construction on what is displayed on the imager:

  • s heat escaping from the building and what might that suggest about construction?
  • Are studs visible or is a masonry wall hiding internal heat due to its mass?
  • How is the building’s mass affecting the image?
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