In a specified hose layout, what is the total pressure loss for a pumper with two sections of 3-inch hose siamesed into a 5-inch attack line flowing at 350 GPM?

To determine the total pressure loss in a specified hose layout involving two sections of 3-inch hose siamesed into a 5-inch attack line flowing at 350 GPM, it's essential to consider the friction loss associated with the hose sizes and flow rate.

For any hose, the friction loss is typically calculated using a formula derived from flow rate, hose diameter, and length. In the case of the layout described:

1. Each section of the 3-inch hose contributes to the total friction loss. The friction loss in 3-inch hose is significant at higher flow rates—like the 350 GPM specified. As flow rate increases, friction loss also increases due to turbulence and resistance of the water flow against the internal walls of the hose.

2. When two 3-inch hoses are siamesed, the effective diameter increases, which can reduce friction loss compared to using a single hose alone. However, when flowing 350 GPM through both sections, the combined flow still maintains considerable friction loss.

3. Transitioning into the 5-inch attack line also triggers another consideration for pressure loss during the transition. The larger diameter hose (the 5-inch) is more efficient at lower friction loss for the same flow rate.

After calculating the