What is needed to account for the length of the hose in pressure calculations?

In pressure calculations for fire hose operations, accounting for the friction loss is vital. Friction loss occurs due to the resistance of water flowing through the hose, which is influenced by the length of the hose, its diameter, the flow rate of water, and the roughness of the interior surface of the hose.

When calculating the total pressure needed at the pump to adequately deliver water to a nozzle, it's important to factor in the friction loss that occurs as water travels through the hose. The longer the hose, the higher the friction loss, which directly affects the pressure needed to maintain effective water flow.

Other factors like nozzle diameter, elevation gain, and atmospheric pressure play roles in overall system pressure calculations but do not specifically address the resistance encountered due to the length of the hose. Thus, while they are important in various contexts, the friction loss is the key element needed to accurately account for the hose length in pressure calculations.