What problems could occur in the event of a water hammer?

What problems could occur in the event of a water hammer?

• A. It can cause damage to the hoseline or pumper.
• B. Pressures decrease on the attack crew's hoseline.
• C. It will cause backflow.
• D. The pump on the pumper may cavitate.

Answer: (A)

Water hammer is a pressure surge that happens when moving water is suddenly stopped or a valve is closed quickly. The inertia of the flowing water keeps it pushing forward, creating a shock wave that travels through the hose and fittings. That spike can exceed what the hose, fittings, and pump are designed to handle, leading to damage such as ruptured hoses, failed couplings, or even damage to the pump itself. So the most likely problem described is damage to the hoseline or pumper. The other possibilities aren’t the typical outcome. A water hammer surge raises pressure rather than lowers it, so a drop in pressure on the attack line isn’t the usual result. Backflow isn’t an inherent consequence of a transient pressure spike, and cavitation involves low pressure in the pump suction causing vapor pockets—not the immediate surge along the hose that characterizes water hammer.

Water hammer is a pressure surge that happens when moving water is suddenly stopped or a valve is closed quickly. The inertia of the flowing water keeps it pushing forward, creating a shock wave that travels through the hose and fittings. That spike can exceed what the hose, fittings, and pump are designed to handle, leading to damage such as ruptured hoses, failed couplings, or even damage to the pump itself. So the most likely problem described is damage to the hoseline or pumper.

The other possibilities aren’t the typical outcome. A water hammer surge raises pressure rather than lowers it, so a drop in pressure on the attack line isn’t the usual result. Backflow isn’t an inherent consequence of a transient pressure spike, and cavitation involves low pressure in the pump suction causing vapor pockets—not the immediate surge along the hose that characterizes water hammer.