What are the different types of burn patterns?
A fire pattern is defined in NFPA 921 as, “the visible or measurable physical change, or identifiable shapes, formed by a fire effect or group of fire effects” 3. Various types of fire patterns, such as; “V-shaped”, “hour-glass”, and “inverted cone”, have come from common observation at actual fire scenes.
What is a burn pattern?
The characteristic configuration of char left by a fire. In wildland fires burn patterns are influenced by topography, wind direction, length of exposure, and type of fuel.
What is pour patterns in arson?
The fire showed all the classic signs of arson, includ- ing “pour patterns” on the floor: demarcation lines between burned and unburned areas that suggested a flammable liquid had been poured and ignited.
What are the two 2 basic types of fire patterns?
Fire patterns fall into two general types, both of which are regulated by the chemistry and physics of fire, as well as by method of construction. Movement patterns are those which are the result of growth and extension of fire and products of combustion away from the original heat source.
What do burn patterns show?
When interpreted properly, these burn patterns allow the investigator to trace the path of fire spread in reverse; this will lead him back to the area where the fire originated to determine what caused the fire. When the area where the fire originated is found, it is secured and processed to determine the cause.
What are the two types of fire patterns?
What is an irregular burn pattern?
Commonly, irregular burn patterns on a floor are simply the result of drop-down, radiant heat, melting foam furnishings, or protected areas whereas irregularly shaped objects such as clothing were lying. If an ignitable liquid is suspected, take a sample of flooring to verify the hypothesis.
Which of the following accelerants causes the most intense burn patterns?
Ignitable liquid pour pattern: Intense burn patterns are caused by ignitable liquid hydrocarbon accelerants such as gasoline, kerosene, or diesel that have high boiling points.
What evidence is left by an arsonist?
The following may indicate arson: signs of forceful entry into the structure; indications that another crime was committed on the premises; evidence of efforts to impede firefighter access to the building; windows left open, holes bored in walls, or interior doors tied open; removal of valuable property from the …
How do you investigate an arson case?
The Process of Investigating Arson
- Step One: Arrival at Scene.
- Step Two: Evaluating the Scene.
- Step Three: Documenting the Scene.
- Step Four: Processing Evidence.
- Step Five: Completing the Investigation.