In relay pumping, what is the role of the forward engine?

• A. To assemble and test equipment before deployment.
• B. To draft water from a hydrant.
• C. To supply pressurized water to the next engine in the relay and help maintain downstream pressure.
• D. To regulate foam concentrations.

Answer: (C)

In relay pumping, the forward engine serves as the pressure source for the relay line and is located toward the water source. Its job is to supply pressurized water to the next engine in the relay, establishing and maintaining the discharge pressure that keeps the water moving down the line. By pushing water into the relay hose at a set pressure, it compensates for friction losses and elevation changes so downstream engines can continue to pump effectively toward the attack line. Foam regulation and pre-deployment tasks aren’t the role of the forward engine in this setup.