Which statements about stopping the flow of flammable gas from a cylinder involved in a fire are correct?

Which statements about stopping the flow of flammable gas from a cylinder involved in a fire are correct?

• A. Statement 1 is true, statements 2 and 3 are false.
• B. Statements 1 and 2 are true, statement 3 is false.
• C. All three statements are true.
• D. Statement 1 is false, statements 2 and 3 are true.

Answer: (C)

Stopping the flow of flammable gas from a cylinder in a fire centers on controlling the fuel at the source while protecting the responders and the scene. If you can reach the cylinder valve safely, closing it stops the release right at its origin, which is the most direct way to halt the fire’s fuel. If the valve can’t be shut because of heat, damage, or its position, isolating the gas supply from the rest of the system or shutting off the upstream valve minimizes additional gas entering the area. At the same time, cooling the cylinder with water helps prevent a potential rupture by keeping its temperature—and thus internal pressure—lower. This combination of shutting the flow at the source, isolating the gas supply when needed, and cooling the cylinder reflects a practical, layered approach to managing gas cylinders involved in fires, so all these steps describe valid actions.

Stopping the flow of flammable gas from a cylinder in a fire centers on controlling the fuel at the source while protecting the responders and the scene. If you can reach the cylinder valve safely, closing it stops the release right at its origin, which is the most direct way to halt the fire’s fuel. If the valve can’t be shut because of heat, damage, or its position, isolating the gas supply from the rest of the system or shutting off the upstream valve minimizes additional gas entering the area. At the same time, cooling the cylinder with water helps prevent a potential rupture by keeping its temperature—and thus internal pressure—lower. This combination of shutting the flow at the source, isolating the gas supply when needed, and cooling the cylinder reflects a practical, layered approach to managing gas cylinders involved in fires, so all these steps describe valid actions.