What are the three methods for applying class B foam to a liquid fire or spill?

What are the three methods for applying class B foam to a liquid fire or spill?

• A. Roll-On, Bank-Down, Rain-Down (Roll-on down to the Bank to make it Rain)
• B. Roll-On and Bank-Down
• C. Rain-Down and Roll-On
• D. Roll-On and Rain-Down

Answer: (A)

When fighting liquid fuel fires or spills with Class B foam, the goal is to create a continuous foam blanket on the fuel surface to cool the liquid, separate fuel from air, and suppress vapors. The three methods used to apply foam are Roll-On, Bank-Down, and Rain-Down. Roll-On involves discharging foam so it rolls across the surface, quickly covering the fuel and forming a protective film. Bank-Down builds a dense foam layer by banking foam along the surface from a nozzle, creating a thick blanket over the liquid. Rain-Down pours foam from above, allowing the foam to blanket large areas or irregular spills by raining down onto the surface. The choice among these methods depends on spill size, surface conditions, wind, and fuel type, all aimed at maintaining a stable foam layer that helps prevent ignition and cools effectively.

When fighting liquid fuel fires or spills with Class B foam, the goal is to create a continuous foam blanket on the fuel surface to cool the liquid, separate fuel from air, and suppress vapors. The three methods used to apply foam are Roll-On, Bank-Down, and Rain-Down. Roll-On involves discharging foam so it rolls across the surface, quickly covering the fuel and forming a protective film. Bank-Down builds a dense foam layer by banking foam along the surface from a nozzle, creating a thick blanket over the liquid. Rain-Down pours foam from above, allowing the foam to blanket large areas or irregular spills by raining down onto the surface. The choice among these methods depends on spill size, surface conditions, wind, and fuel type, all aimed at maintaining a stable foam layer that helps prevent ignition and cools effectively.