What describes the use of two or more pumpers to move water over a long distance by operating them in series?

• A. Relay Pumping
• B. Pressure governor
• C. Pump and roll
• D. Responsibility of purchaser

Answer: (A)

Relaying water with multiple pumpers in series allows you to push water much farther than a single pump could manage. The first engine draws or drafts water and pushes its discharge into the intake of the next pump, which then adds more pressure and continues the flow to the following unit, and so on. Each pumper in the chain helps overcome friction losses and any elevation changes so the water reaches a distant attack point with enough nozzle pressure. This method is used when there aren’t hydrants along the route or the distance is too great for one pump to maintain adequate pressure. The other terms described—a device to regulate pressure, a moving-attack tactic, or irrelevant administrative duties—do not describe this setup.