What is the calculated friction loss (FL) for 370 GPM in 2 ½" hose according to the pump chart?

To determine the calculated friction loss for 370 GPM in 2 ½" hose, it's essential to understand how friction loss is typically calculated and how it is represented in pump charts. The friction loss in hoses is often expressed in psi per 100 feet of hose length. In many situations, when looking at charts, the loss typically increases with flow rate.

Given that the question refers to 370 GPM, it's likely that the value is estimated based on a nearby standard flow, which is 350 GPM. The closest value on the provided options that corresponds to the flow rate of 350 GPM while taking into consideration the flow increase is critical.

The value of 18 psi represents a reasonable friction loss for 350 GPM in 2 ½" hose, as it aligns with typical values provided in frequency charts or friction loss tables used by fire services. Understanding that friction loss is not linear and often requires adjustment upward as flow rate increases further solidifies the reasoning for selecting this specific psi reading.

Estimating 370 GPM based on the 350 GPM standard, rather than using a direct measurement, further supports the choice because 370 GPM would likely experience slightly increased friction loss compared to the lower 350