Which fire pattern is often caused by a natural gas leak?

Which fire pattern is often caused by a natural gas leak?

• A. V-Pattern
• B. Crescent Pattern
• C. Inverted Cone Pattern
• D. Ceiling Pattern

Answer: (C)

The pattern being tested is tied to how gas behaves in air and how flames spread from a gas source. Natural gas is lighter than air and tends to rise and pool near the ceiling. When it ignites, the flames radiate outward along the ceiling and upper portions of the room, producing a burn pattern that is wide at the top and narrows down toward the lower areas—an inverted cone shape. This upward-radiating, ceiling-associated spread is why a gas leak often leaves an inverted cone pattern. For contrast, a V-pattern shows flames traveling up a wall from a lower-origin fire, a crescent pattern is a curved, localized burn often from ignition near a specific object or corner, and a general ceiling pattern can result from high heat near the ceiling in other types of fires.

The pattern being tested is tied to how gas behaves in air and how flames spread from a gas source. Natural gas is lighter than air and tends to rise and pool near the ceiling. When it ignites, the flames radiate outward along the ceiling and upper portions of the room, producing a burn pattern that is wide at the top and narrows down toward the lower areas—an inverted cone shape. This upward-radiating, ceiling-associated spread is why a gas leak often leaves an inverted cone pattern.

For contrast, a V-pattern shows flames traveling up a wall from a lower-origin fire, a crescent pattern is a curved, localized burn often from ignition near a specific object or corner, and a general ceiling pattern can result from high heat near the ceiling in other types of fires.