What is the primary function of a relay pumper in a multi-pumper operation?

• A. Receive water from the previous pumper, boost the pressure, and send it down the line to maintain the required volume and pressure over long distances.
• B. Document NFPA compliance for the pump equipment.
• C. Track recurring mechanical issues for warranty or replacement planning.
• D. Provide legal protection in case of an accident.

Answer: (A)

Relaying in a multi-pumper setup is all about keeping the water moving at the right pressure over long hose runs. The relay pumper’s job is to take water from the previous pumper, boost the pressure to overcome friction losses and elevation changes, and push it forward to the next engine or to the attack line, so the target flow and pressure are maintained as the water travels farther.

This boost is essential because as water travels through long hoses, friction reduces pressure and the pump’s output pressure can drop. The relay pumper compensates for that drop, ensuring the nozzle still receives the needed flow and pressure.

The other options describe administrative or defensive tasks (documenting NFPA compliance, tracking mechanical issues for warranty, or providing legal protection), which aren’t about the hydraulic function of boosting and delivering water in a relay.