To reduce pressure loss due to friction in hoses, what is recommended?

Using larger diameter hoses or multiple lines is the recommended approach to reduce pressure loss due to friction in hoses. When water flows through a hose, it experiences friction against the interior walls, which can reduce the available pressure at the nozzle. Larger diameter hoses have a greater cross-sectional area, allowing more water to flow through with less resistance. This results in a lower friction loss compared to smaller hoses. Additionally, using multiple lines can also distribute the flow effectively, further minimizing pressure loss.

In contrast, longer hoses typically increase friction loss because the amount of hose surface area in contact with the water increases, which can lead to additional resistance and pressure drop. Smaller diameter hoses would further exacerbate the issue by narrowing the flow path, increasing resistance and resulting in more significant pressure loss. Increasing water temperature does not address the problem of friction loss and can introduce other complications like vaporization or excessive heat. Thus, employing larger diameter hoses or multiple lines is a more effective strategy to maintain pressure and optimize water flow in firefighting operations.