To lower firemain pressure while increasing flow, what is the recommended action?

Reducing the number of pumps online is the recommended action to lower firemain pressure while increasing flow. When fewer pumps are in operation, the total pressure generated by the system decreases, allowing for a higher flow rate at the available outlets. This action can help manage pressure without compromising the overall delivery of water to the fire stations.

In fire protection systems, the relationship between pressure and flow is critical. Operating multiple pumps typically raises the pressure, which can be efficient for achieving high flow rates when needed. However, if the objective is to increase flow while reducing pressure, strategically shutting down some pumps achieves this balance. This is particularly important if the fire situation dictates the need for more water delivery rather than maintaining high pressure, which may not be useful in such scenarios.

While activating emergency pumps, closing isolation valves, or opening additional fire stations might be necessary in certain situations, these actions do not specifically address the requirement to lower pressure while enhancing flow as effectively as reducing the number of operational pumps.